JP5558897B2 - Radiation measurement system - Google Patents

Description

  The present invention relates to a radiation measurement system.

  For example, in facilities that handle radioactive substances such as nuclear power plants, a device for measuring the radiation dose is installed to monitor the radiation dose (for example, Patent Document 1). In such a measurement device, a sensor device that measures radiation dose is installed at each of a plurality of measurement points, and an information collection device that receives and collects measurement results from the sensor device at different points away from the measurement point is installed. Measurements are being made.

  In addition, the facilities as described above are required to continuously measure the radiation dose. Therefore, in order to avoid a failure due to deterioration of the sensor device or the like, work is periodically performed to replace the installed sensor device with a new sensor device. Even when this exchange is performed, continuous measurement is required. Therefore, for example, in addition to the existing sensor device, a new sensor device is installed at the same measurement point. And by providing a period for measuring in parallel by the two sensor devices, and stopping and removing the measurement by the existing sensor device, without interrupting the measurement (missing measurement) Exchange.

  When exchanging the sensor device as described above, if the sensor device and the information collecting device are communicating via a wired line, the sensor device and the information collecting device are connected when the sensor device is replaced with a newly installed sensor device. Wired line connection must be switched from the existing sensor device to the newly installed sensor device, resulting in missing measurements. Therefore, it is conceivable to perform communication using a wireless line instead of a wired line so that the line for connecting the sensor device and the information collecting apparatus is not switched.

JP-A-10-325875

  However, even if communication between the sensor device and the information collection device is performed via a wireless line, when the existing sensor device is replaced with a newly installed sensor device, a part of the measurement period may overlap. There is a possibility of wrong measurement.

  FIG. 6 is a diagram illustrating an example in which part of the measurement period overlaps when the sensor device is replaced. Here, a case where the sensor device A is an existing sensor device and the sensor device B is a newly installed sensor device will be described. In addition, it is assumed that the sensor device B is already installed at the same measurement point as the sensor device A, and the sensor devices A and B are measuring in parallel.

  As shown in the figure, the two sensor devices A and B measure the radiation dose by counting the pulse signals generated in response to the detection of the radiation for a predetermined period. Here, it is assumed that the measurement time periods in the sensor devices A and B are the same length. In addition, the sensor devices A and B count the falling edges of the pulse signal.

As shown in the figure, when the same pulse signal is generated in the sensor devices A and B, the radiation dose measured by the sensor device A is in the interval 1 (time t1 to t3) and the interval 2 (time t3 to t5). 4 and 3. On the other hand, the radiation dose measured by the sensor device B is 3 and 5 in the section 3 (time t2 to t4) and the section 4 (time t4 to t6).
When measuring the radiation dose by switching to the newly installed sensor device B between the time t3 and the time t4 when the measurement in the section 1 of the sensor device A is completed, the sensor device A, after the measurement in the section 1, Measurement information indicating the measured radiation dose is transmitted to the information collecting apparatus. This measurement information includes information indicating 4 which is the radiation dose obtained by counting the pulse signals a, b, c and d.

  After the replacement of the sensor device, the sensor device B transmits measurement information to the information collection device at time t4. However, this measurement information is the radiation dose obtained by counting the pulse signals b, c, d, and is information including the pulse signals b, c, d already measured by the sensor device A. As described above, when the sensor devices are replaced, the measurement periods are overlapped, so that the pulse signals are counted repeatedly and erroneous measurement is performed.

  That is, if the existing sensor device and the new sensor device start and complete measurement at different timings, there is a problem that erroneous measurement is performed. In other words, in order to prevent missing measurement, if the measurement is performed in parallel with the existing and new sensor devices and the sensor device is replaced, a period in which the measurement is repeated occurs and correct measurement is not performed. There is a problem that cases arise.

  The present invention has been made to solve the above problems, and in a radiation measurement system including a sensor device and an information collection device, it is possible to minimize the occurrence of missing or erroneous measurements and replace the sensor device. An object of the present invention is to provide a radiation measurement system capable of

  (1) In order to solve the above problem, the present invention provides a measurement unit for measuring a radiation dose, a radio unit for receiving a reset signal indicating the start of a period for measuring the radiation dose, and the radio unit receiving a reset signal. A plurality of sensor devices comprising: a control unit that, when received, causes the wireless unit to transmit measurement information indicating the radiation dose measured by the measurement unit, and causes the measurement unit to start measuring the radiation dose in a next period; An information collection device that receives measurement information transmitted from the sensor device and totals the received measurement information, and at least one of the plurality of sensor devices or the information collection device is a predetermined period. The radiation measurement system is characterized in that the reset signal is transmitted every time a measurement period is started.

(2) Further, in the present invention described above, the reset signal is encrypted with a predetermined secret key, and the control unit stores information indicating the secret key in advance. A reset signal determination unit that determines whether the received signal is a reset signal based on the secret key, and the reset signal determination unit determines in advance what pattern the next reset signal has When the prepared signal and the received signal match, it is determined whether the signal is a reset signal, and when the signal received by the reset signal determination unit is determined to be a reset signal The measurement unit transmits measurement information through the radio unit, and causes the measurement unit to start measuring radiation in the next period.

  (3) Further, according to the present invention, in the invention described in the above, when the reset signal is input through the wireless unit, the control unit measures the time elapsed since the reset signal was input last time. And when the period measured by the interval measurement timer unit and the measurement period coincide with each other, the measurement information obtained by the measurement unit is transmitted to the radio unit, and in the next measurement period The measurement of the radiation dose is started by the measurement unit.

(4) Further, in the invention described above, the control unit includes an internal timer unit that measures a time elapsed since the measurement unit started measuring the radiation dose , When it is detected by the internal timer unit that the measurement period has ended and a reset signal is not input through the radio unit, the measurement information obtained by the measurement unit is transmitted through the radio unit, and the next measurement is performed. The measurement unit starts measurement of radiation in a period.

(5) Further, in the present invention described above, when the control unit provided in the newly installed sensor device among the plurality of sensor devices receives a reset signal through the wireless unit, An interval measurement timer unit that measures the time elapsed since the reset signal was input last time, and an internal timer unit that measures the time elapsed since the measurement unit started measuring the radiation dose , When an existing sensor device to be exchanged among sensor devices is transmitting a reset signal, when the period measured by the interval measurement timer unit matches the measurement period, the measurement unit The obtained measurement information is transmitted to the wireless unit, and the measurement unit starts measurement of radiation dose in the next measurement period, and the existing sensor device is measured. When transmission of the reset signal is stopped, when the internal timer unit detects that the measurement period has ended, the measurement information obtained by the measurement unit is transmitted through the radio unit, and in the next measurement period Radiation measurement is started by the measurement unit.

  According to this invention, either the existing sensor device or the information collecting device transmits a reset signal, and the newly installed sensor device starts measurement in the next period in response to the reset signal. The measurement periods of the existing sensor device and the newly installed sensor device can be synchronized. As a result, when replacing an existing sensor device with a newly installed sensor device, it is possible to minimize the occurrence of a period in which no measurement is performed and a period in which a measurement is performed repeatedly. Exchange can be performed, and it is possible to prevent missing or erroneous measurement.

It is a schematic block diagram which shows the structure of the radiation measurement system 1 in this embodiment. It is a figure which shows an example of encryption of the reset signal produced | generated by the reset signal production | generation part 120 in this embodiment. It is a flowchart which shows the process which determines the validity of the reset signal in the control part 11 in this embodiment. It is a flowchart which shows operation | movement of the internal reset signal production | generation part 117 which the control part 11 in this embodiment has. It is a schematic diagram which shows the operation example at the time of replacement | exchange of the sensor apparatus 10 in this embodiment. It is a figure which shows an example which a missing measurement arises when replacing | exchanging a sensor apparatus.

Hereinafter, a radiation measurement system according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic block diagram showing a configuration of a radiation measurement system 1 in the present embodiment.
As shown in FIG. 1, the radiation measurement system 1 includes a plurality of sensor devices 10 and at least one information collection device 20.

  The information collection device 20 receives the measurement information transmitted from the sensor device 10 at a predetermined time interval, and measures the measurement information received by the wireless unit 21 and outputs the measurement information to an external device. And an information totaling unit 22. For example, the measurement information totaling unit 22 outputs the received measurement information to each external device as time series information for each sensor device 10.

  The sensor device 10 continuously measures radiation by measuring the radiation dose in the measurement period and repeating the operation of transmitting the measured radiation dose to the information collecting device 20 for each measurement period that is a predetermined time interval. Measure quantity. For example, when the time interval is set to 1 minute, the sensor device 10 repeatedly performs the operation of measuring the radiation dose for 1 minute and transmitting the information indicating the measured radiation dose to the information collecting device 20. And measure the radiation dose.

  One of the sensor devices 10 provided in the radiation measurement system 1 transmits a reset signal in order to synchronize the start of the measurement period between the sensor devices 10. When the other sensor device 10 receives the reset signal, the other sensor device 10 performs a process of synchronizing the start of the period during which the radiation dose is measured. Here, an operation for transmitting a reset signal to another sensor device 10 is referred to as a main operation, and an operation for receiving a reset signal from another sensor device 10 and synchronizing the start time is referred to as a subordinate operation. In the radiation measurement system 1, the start of the measurement period is synchronized by causing one sensor device 10 to perform a main system operation and perform the operation according to another sensor device 10.

As shown in FIG. 1, the sensor device 10 includes information on a control unit 11 that controls the operation of the sensor device 10, a measurement unit 13 that measures the radiation dose, and information that indicates the radiation dose measured by the measurement unit 13. And a wireless unit 15 that outputs the received signal to the collection device 20.
The control unit 11 includes a setting storage unit 111, a reset signal determination unit 112, a reset interval determination unit 113, an internal reset signal generation unit 117, and a reset signal generation unit 120.

  In the setting storage unit 111, a sensor ID given in advance for identifying the own device, a measurement point ID for identifying a point where the own device is installed, operation mode information indicating the operation mode of the own device, Key information indicating a secret key for generating and determining a reset signal is stored. In the operation mode information, information indicating either the main operation or the subordinate operation is set. Each information stored in the setting storage unit 111 is input and stored by an input unit (not shown).

  The reset signal determination unit 112 determines whether the wireless signal received by the wireless unit 15 is a reset signal based on the key information stored in the setting storage unit 111. Specifically, when the received radio signal matches the pattern encrypted by the key information, the radio signal is determined as a reset signal. Further, when the reset signal determination unit 112 determines that the wireless signal is a reset signal, the reset signal determination unit 112 outputs the signal as an external reset signal to the reset interval determination unit 113.

  The reset interval determination unit 113 includes an interval determination control unit 114, an interval measurement timer unit 115, and a previous value storage unit 116. The interval determination control unit 114 receives an external reset signal from the reset signal determination unit 112, a timer value from the interval measurement timer unit 115, and an interval measurement timer unit when the previous external reset signal is input from the previous value storage unit 116. The previous value as a timer value 115 is input. Whether or not the interval determination control unit 114 outputs an external reset signal to the internal reset signal generation unit 117 and the measurement unit 13 based on the timer value (current value) of the interval measurement timer unit 115 and the previous value. Determine.

The interval measurement timer unit 115 measures the time interval for receiving the reset signal. The interval measurement timer unit 115 is set to 0 by the control of the interval determination control unit 114.
The previous value storage unit 116 stores the timer value of the interval measurement timer unit 115 as the previous value under the control of the interval determination control unit 114.

The internal reset signal generation unit 117 includes an internal timer unit 118 and an internal reset control unit 119. The internal timer unit 118 measures the time that has elapsed since the pulse counter unit 132 included in the measurement unit 13 is set to “0”. The timer value of the internal timer unit 118 is set to 0 in accordance with the control of the internal reset control unit 119, the control of the interval determination control unit 114, or the input reset signal.
The internal reset control unit 119 generates an internal reset signal based on the timer value of the internal timer unit 118 and the previous value stored in the previous value storage unit 116.

  The reset signal generation unit 120 includes a timer, and generates a reset signal encrypted with the key information stored in the setting storage unit 111 every time the measurement period expires by the timer. The reset signal generation unit 120 operates when the operation mode information stored in the setting storage unit 111 is the main system operation, and the generated reset signal is transmitted to the internal timer unit 118, the measurement value output unit 133, and Output to the wireless unit 15.

  The measurement unit 13 includes a radiation detection unit 131, a pulse counter unit 132, and a measurement value output unit 133. The radiation detection unit 131 outputs a pulse signal to the pulse counter unit 132 when detecting radiation. The pulse counter unit 132 has a counter therein, and measures the detected radiation dose by incrementing the counter value by “1” each time a pulse signal is input from the radiation detection unit 131.

  The measurement value output unit 133 receives an external reset signal from the reset interval determination unit 113, an internal reset signal from the internal reset signal generation unit 117, and a reset signal from the reset signal generation unit 120. Further, when any of the external reset signal, the internal reset signal, and the reset signal is input, the measurement value output unit 133 reads the count value of the pulse counter unit 132 and sets the count value of the pulse counter unit 132 to 0. Perform zero clear. The measurement value output unit 133 starts measurement of the radiation dose in the next period by setting the count value of the pulse counter unit 132 to zero.

The measurement value output unit 133 includes the sensor ID and measurement point ID stored in the setting storage unit 111, information indicating the radiation dose read from the pulse counter unit 132, operation state information, and time information. Measurement information is generated and output to the wireless unit 15. Here, the time information is information indicating the time read from, for example, a clock provided in the sensor device 10.
Further, the operation state information is information indicating which of the external reset signal, the internal reset signal, and the reset signal has generated the measurement information. In the operation status information, information indicating a slave operation is set when operating according to an external reset signal, and information indicating “operation by the internal timer unit 118” is set when operating according to an internal reset signal. When operating according to the reset signal, information indicating the main system operation is set. The measurement value output unit 133 sets information indicating the main system operation in the operation state information when the external reset signal or the internal reset signal and the reset signal are input simultaneously.

  When receiving the wireless signal, the wireless unit 15 outputs the wireless signal to the reset signal determining unit 112. In addition, the wireless unit 15 transmits the measurement information input from the measurement value output unit 133. In addition, the wireless unit 15 transmits a reset signal input from the reset signal generation unit 120.

FIG. 2 is a diagram illustrating an example of encryption of the reset signal generated by the reset signal generation unit 120 in the present embodiment. Here, a case where the measurement period is 1 minute will be described.
In this case, the reset signal generation unit 120 generates a reset signal every minute. In the example shown in the figure, the reset signal generation unit 120 uses the time information “200912251635, which is an example of 16:35 on December 25, 2009, in which numerical values indicating date and time indicating the generation time of the reset signal are arranged. ”And the key information, an encrypted reset signal pattern is generated. Specifically, information is generated by concatenating “key information”, “time information”, and “key information” in this order, and a pattern is generated by MD5 (Message Digest Algorithm 5) encryption of the generated information. The generated pattern is output as an encrypted reset signal.

The reset signal generated in this way cannot predict what information the reset signal is unless the original information to be encrypted is known. Conversely, if the original information to be encrypted (in this case, information indicating the next time) is known in advance, it is possible to predict what kind of information the reset signal to be transmitted is.
For example, if it is determined in advance that the reset signal is transmitted every minute, the reset signal at each transmission timing is uniquely determined based on the time information. In this case, the reset signal determination unit 112 determines whether the pattern generated in advance from the key information stored in the setting storage unit 111 and the time information matches the signal input from the wireless unit 15. Thus, it can be determined whether or not the input signal is a reset signal.

Further, the same key information is stored in the setting storage unit 111 provided in the sensor device 10 installed at the same point. Of the sensor devices 10 installed at the same point, the sensor device 10 performing the main operation transmits the encrypted reset signal, and the reset signal determination unit provided in the sensor device 10 performing the subordinate operation 112 determines whether the received signal is a reset signal based on the key information.
In addition, although MD5 encryption was shown as an example, you may use another encryption algorithm.

Next, processing of the control unit 11 provided in the sensor device 10 will be described. Here, a case where the measurement period is 1 minute and the interval measurement timer unit 115 and the internal timer unit 118 increase the timer value by 1 every 10 ms will be described as an example.
FIG. 3 is a flowchart showing processing for determining the validity of the reset signal by the reset signal determination unit 112 and the reset interval determination unit 113 of the control unit 11 in the present embodiment.

  In the control unit 11 provided in the sensor device 10, the reset signal determination unit 112 determines whether or not the wireless signal input through the wireless unit 15 is a reset signal (step S101), and until the reset signal is input. It is determined whether or not the input radio signal is a reset signal (step S101: No).

When a reset signal is input to the reset signal determination unit 112 (step S101: Yes), the reset signal determination unit 112 outputs an external reset signal to the interval determination control unit 114. The interval determination control unit 114 determines whether or not the timer value of the interval measurement timer unit 115 is the reset value “6000 (= 1 minute)” (step S102).
Here, the reset value is a value indicating a measurement period, and is a value determined in advance by a time interval at which the timer values of the interval measurement timer unit 115 and the internal timer unit 118 are changed.

When the timer value of the interval measurement timer unit 115 does not match the reset value “6000” (step S102: No), the operations of steps S105 and S106 described later are performed.
On the other hand, when the timer value of the interval measurement timer unit 115 matches the reset value (step S102: Yes), the interval determination control unit 114 reads the timer value (previous value) stored in the previous value storage unit 116, It is determined whether or not the read previous value is a reset value (step S103).

When the previous value read from the previous value storage unit 116 does not coincide with the reset value (step S103: No), the operations of steps S105 and S106 described later are performed.
On the other hand, when the previous value read from the previous value storage unit 116 matches the reset value (step S103: Yes), the interval determination control unit 114 sends an external reset signal to the internal timer unit 118 and the measured value output unit 133. Output. The internal timer unit 118 sets the timer value to 0 when an external reset signal is input. In addition, when an external reset signal is input, the measurement value output unit 133 outputs measurement information including the count value of the pulse counter unit 132 to the wireless unit 15 and sets the count value of the pulse counter unit 132 to 0 (Step S1). S104).
Thereby, the measurement part 13 starts a measurement synchronizing with an external reset signal. The internal timer unit 118 measures the elapsed time in the measurement period in synchronization with the external reset signal.

The interval determination control unit 114 stores the timer value of the interval measurement timer unit 115 in the previous value storage unit 116 (step S105), and sets the timer value of the interval measurement timer unit 115 to 0 (step S106).
As described above, each time the reset signal is received in the control unit 11 provided in the sensor device 10, the interval measurement timer unit 115 measures the period of time that has elapsed since the reset signal was received last time. When the measurement period coincides, the pulse counter unit 132 is cleared to zero. Thereby, after determining the validity of the reception interval of the received reset signal, the start of the measurement period for measuring the radiation dose can be synchronized with the received reset signal.

FIG. 4 is a flowchart showing the processing of the internal reset signal generation unit 117 included in the control unit 11 in the present embodiment.
The internal reset control unit 119 included in the internal reset signal generation unit 117 determines whether or not a predetermined time (10 ms) for changing the timer value of the internal timer unit 118 has passed (step S201). The determination is repeated until the time for changing the timer value 118 has elapsed (step S201: No).

  When the time for changing the timer value of the internal timer unit 118 elapses (step S201: Yes), the internal reset control unit 119 increases the timer value of the internal timer unit 118 by “1” (step S202), and increases the timer. It is determined whether or not the current measurement period has ended by determining whether or not the value matches the reset value “6000” (step S203).

When the timer value of the internal timer unit 118 does not match the reset value (step S203: No), the process returns to step S201.
On the other hand, when the timer value of the internal timer unit 118 matches the reset value (step S203: Yes), the internal reset control unit 119 sets the timer value of the internal timer unit 118 to 0 (step S204), and the interval measurement timer unit It is determined whether the timer value 115 matches the reset value (step S205).

When the timer value of the interval measurement timer unit 115 matches the reset value (step S205: Yes), the process returns to step S201.
On the other hand, when the timer value of the interval measurement timer unit 115 does not match the reset value (step S205: No), the internal reset control unit 119 sets the timer value of the internal timer unit 118 to 0 and outputs the internal reset signal. Generated and output to the measured value output unit 133. When the internal reset signal is input from the internal reset control unit 119, the measurement value output unit 133 outputs measurement information including the count value of the pulse counter unit 132 to the radio unit 15, and sets the count value of the pulse counter unit 132 to 0. (Step S206).
Hereinafter, the internal reset control unit 119 repeats the operations of steps S201 to S206.

  As described above, in the control unit 11 provided in the sensor device 10, the internal reset control unit 119 determines whether or not the current measurement period has ended based on the timer value of the internal timer unit 118. Further, it is determined whether or not the time elapsed after receiving the reset signal from the timer value of the interval measurement timer unit 115 coincides with the measurement period. As a result of these determinations, if the current measurement period ends and the time elapsed since the reception of the reset signal is longer or shorter than the measurement period, it is determined that the reset signal could not be received correctly, and autonomously An internal reset signal is output to the measured value output unit 133.

  When there are a plurality of sensor devices 10 that perform main operation by the operations of the reset interval determination unit 113 and the internal reset signal generation unit 117 included in the control unit 11 described above, and a plurality of reset signals are transmitted at different timings, It becomes impossible to correctly measure the radiation dose for each predetermined measurement period, and it is possible to prevent erroneous measurement. Further, even when there is no sensor device 10 that performs main system operation and no reset signal is transmitted, the internal reset signal generation unit 117 generates the internal reset signal, so that the radiation dose for each predetermined measurement period can be obtained. Measurement can be continued.

  Next, an operation example when replacing the sensor device 10 will be specifically described. Here, the case where the existing sensor device 10a and the information collecting device 20 are operated and the sensor device 10a is replaced with a newly installed sensor device 10b will be described as an example. In this case, the main operation of the sensor device 10a is set.

FIG. 5 is a schematic diagram illustrating an operation example when the sensor device 10 according to the present embodiment is replaced.
At time t1, in addition to the sensor device 10a and the information collection device 20, a new sensor device 10b is installed at the same measurement point as the sensor device 10a. Here, a slave operation is set in the sensor device 10b.

At time t2, a reset signal is transmitted from the sensor device 10a. At this time, the sensor device 10b receives the reset signal, but does not synchronize the measurement period according to the determination of the reset interval determination unit 113.
At time t3, a reset signal is transmitted from the sensor device 10a. At this time, the sensor device 10b receives the reset signal and synchronizes the start of the measurement period. Thereby, the timing which starts the measurement period of the sensor apparatus 10a and the sensor apparatus 10b continues synchronizing with the reset signal transmitted from the sensor apparatus 10a. That is, the measurement periods of the sensor devices 10a and 10b continue to be synchronized.
Note that the measurement information transmitted from the sensor device 10b between time t1 and time t3 is discarded because it is not synchronized with the measurement information of the sensor device 10a.

At time t4, the operation of the sensor device 10a is stopped and removed from the measurement point. From this time point, the sensor device 10b operates by the internal timer unit 118.
At time t5, the main system operation is set in the sensor device 10b. At this time, the timer value of the internal timer unit 118 and the timer included in the reset signal generation unit 120 are synchronized. Thereby, the sensor apparatus 10b transmits a reset signal with the same period as the period when the sensor apparatus 10a transmitted the reset signal.

As described above, when exchanging from the sensor device 10a to the sensor device 10b, the sensor devices 10a and 10b are operated at the same time, and the measurement period is synchronized to measure the radiation dose. The measurement can be continued and the sensor device 10 can be replaced without causing an erroneous measurement.
In the operation example shown in FIG. 5, the case where the operation mode information of the sensor device 10b is switched to the main operation at time t5 has been described. However, the operation by the internal timer unit 118 is continued without switching to the main operation. You may do it.

As described above, in the radiation measurement system 1, the pulse counter unit 132 is cleared to zero and the generated reset signal is transmitted by the reset signal generated by the sensor device 10 performing the main system operation. Then, the sensor device 10 that performs the secondary operation clears the pulse counter unit 132 to zero by the reset signal received from the sensor device 10 that performs the main operation. Thereby, the start of the measurement period which measures a radiation dose can be synchronized.
Thus, when the existing sensor device 10 is replaced, the existing sensor device 10 is operated in the main system, and the newly installed sensor device 10 is operated in the main system. Then, after synchronizing the start of the measurement period between the existing sensor device 10 and the newly installed sensor device 10, the existing sensor device 10 is removed, so that a period during which no measurement is performed (missing) The sensor device 10 can be exchanged without causing a measurement period) or a period in which measurement is repeated.

  Further, in the radiation measurement system 1 according to the embodiment of the present invention, since the encrypted information is used as the reset signal, the sensor device 10 performing the slave operation erroneously resets the noise signal or the radio signal from another system. It is possible to prevent the signal from being determined as a signal and starting measurement in the next measurement period. Further, even in a situation where there is a signal that disturbs the measurement, it can be determined whether or not the received signal is a correct reset signal, so that the measurement period of the sensor device 10 can be measured without performing an erroneous measurement. Start can be synchronized.

  Further, in the radiation measurement system 1 according to the embodiment of the present invention, when there are a plurality of sensor devices 10 that perform a main operation due to erroneous setting of operation mode information, a reset signal that the sensor device 10 that performs a subordinate operation receives After determining whether or not the time interval for receiving the signal coincides with the measurement period, the start of the measurement period is synchronized. Thereby, there are a plurality of sensor devices 10 that transmit a reset signal, and even if the reset signal is received at an interval shorter than the measurement period, it is possible to prevent measurement during a period shorter than the measurement period.

In the radiation measurement system 1 according to the embodiment of the present invention, since the operation state information is included in the measurement information and transmitted, the information collection device 20 includes a plurality of sensor devices 10 installed at the same measurement point. It can be determined whether or not they are operating synchronously.
Specifically, when “operation by the internal timer unit 118” is set in the operation state information included in the received measurement information, the sensor device 10 that has transmitted the measurement information is synchronized with the other sensor devices 10. It can be determined that it is not. At this time, when there is a sensor device 10 that is not operating in synchronization with other sensor devices 10, the information collection device 20 may output information for notifying the measurer of an error.

The sensor device 10 is not limited to being replaced, and a plurality of sensor devices 10 may be installed and operated at the same measurement point. At this time, one of the plurality of sensor devices 10 is set to perform a main operation, and the other sensor device 10 is set to perform a subordinate operation. Thereby, the sensor apparatus 10 can be multiplexed and it can prevent that missing measurement arises from a failure.
Further, a plurality of information collection devices 20 may be installed and operated at the same measurement point. Thereby, the information collection apparatus 20 can be multiplexed and the reliability of the radiation measurement system 1 can be improved. In addition, the information collecting apparatus 20 can be replaced without causing any missing measurement.

  Further, the reset value indicating the measurement period may be set within a certain range according to the accuracy of measuring the time of the interval measurement timer unit 115, the internal timer unit 118, and the like. For example, when the measurement period is 1 minute, the interval measurement timer unit 115 and the internal timer unit 118 change the timer value every 10 ms, and an error of ± 50 ms per minute occurs, the range of the reset value is Depending on the setting, it may be set to 5995 to 6005 to make each determination. Further, a margin may be taken and the reset value range may be set to 5990-6010.

Further, in the present embodiment, the case where the wireless unit 15 transmits when measurement information is input has been described. Not limited to this, the wireless unit 15 may transmit the measurement information after a predetermined time has elapsed since the measurement information was input. Thereby, when the sensor apparatus 10 and the information collection apparatus 20 communicate by the TDMA method, it is possible to prevent measurement information from being transmitted from each sensor apparatus 10 in synchronization with the reset signal. Can stably receive measurement information.
Communication between the sensor device 10 and the information collection device 20 may be performed by a CDMA method, an FDMA method, or the like.

  In the present embodiment, the wireless unit 15 receives a wireless signal at the timing of transmitting measurement information, and detects whether or not it interferes with transmission of measurement information by another sensor device 10. Good. When the interference is detected, the measurement information may be transmitted again after a randomly set waiting time has elapsed. Thereby, it is possible to prevent signals transmitted from the plurality of sensor devices 10 from interfering with each other and prevent the information collecting device 20 from receiving measurement information correctly, and to stably receive measurement information.

  In the present embodiment, the configuration in which the reset signal is an encrypted pattern has been described. However, the present invention is not limited to this, and a predetermined pattern may be used for the reset signal, and it may be determined whether the received radio signal is a reset signal based on whether the pattern matches the pattern.

  Further, in the present embodiment, when different radiation doses are measured between the plurality of sensor devices 10 installed at the same measurement point, any radiation dose is determined as a measurement result based on the operation state information included in the measurement information. The measurement information totaling unit 22 may select whether to do so. For example, the measurement value of the sensor device 10 performing the main system operation may be selected as an effective value. Moreover, when sensor ID is provided in the order with which the sensor apparatus 10 was manufactured, the measurement information totaling part 22 may be made to select the radiation dose measured by the new sensor apparatus 10 based on sensor ID. .

  Moreover, in this embodiment, although the structure which the sensor apparatus 10 which performs main | systematic operation | movement transmits a reset signal was shown, you may make it the information collection apparatus 20 produce | generate and transmit a reset signal. In addition, the radiation measurement system 1 may be provided with a device that records accurate time, and the device may generate and transmit a reset signal.

  In this embodiment, the reset signal generation unit is configured to output the generated reset signal to the internal timer unit 118, the measurement value output unit 133, and the radio unit 15. However, the reset signal generation unit outputs only the radio unit 15, The internal timer unit 118 and the measured value output unit 133 may be reset by receiving the reset signal transmitted from the station by the wireless unit 15 of the own station.

  Moreover, you may make it change the operation mode information memorize | stored in the setting memory | storage part 111 of the sensor apparatus 10 in this embodiment with a radio signal. For example, by transmitting a control signal including information for changing the operation mode information and the sensor ID, the operation of the sensor device 10 having the same sensor ID transmitted is changed from the main operation to the sub operation, The operation may be changed from the slave operation to the master operation.

  The sensor device 10 described above may have a computer system inside. In this case, the process performed by the control unit 11 described above is stored in a computer-readable recording medium in the form of a program, and the above process is performed by the computer reading and executing the program. . Here, the computer-readable recording medium means a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Alternatively, the computer program may be distributed to the computer via a communication line, and the computer that has received the distribution may execute the program.

  Further, the sensor device 10 may count the number of reset signals that come at regular intervals and the number of external reset signals by the internal timer unit 118, and may treat the clock signal that functions as a clock.

  DESCRIPTION OF SYMBOLS 1 ... Radiation measurement system 10, 10a, 10b ... Sensor apparatus, 11 ... Control part, 13 ... Measurement part, 15 ... Radio | wireless part, 20 ... Information collection apparatus, 21 ... Radio | wireless part, 22 ... Measurement information totaling part, 111 ... Setting memory 112, reset signal determination unit 113, reset interval determination unit 114, interval determination control unit 115, interval measurement timer unit 116, previous value storage unit 117, internal reset signal generation unit 118, internal Timer unit, 119 ... Internal reset control unit, 120 ... Reset signal generation unit, 131 ... Radiation detection unit, 132 ... Pulse counter unit, 133 ... Measurement value output unit

Claims (4)

A measurement unit that measures the radiation dose, a wireless unit that receives a reset signal indicating the start of a period for measuring the radiation dose, and a measurement that indicates the radiation dose measured by the measurement unit when the wireless unit receives the reset signal A plurality of sensor devices including a control unit that transmits information to the wireless unit and causes the measurement unit to start measuring radiation dose in the next period;
An information collecting device that receives measurement information transmitted from the sensor device and totals the received measurement information;
Comprising
At least one of the plurality of sensor devices or the information collection device transmits the reset signal at the start of a measurement period that is a predetermined period;
The reset signal is encrypted with a predetermined secret key,
The control unit stores information indicating the secret key in advance, and includes a reset signal determination unit that determines whether the received signal is a reset signal based on the secret key, and the reset signal determination The unit prepares in advance what pattern the next reset signal is, and determines whether the signal is a reset signal by determining whether the prepared pattern matches the received signal, When the signal received by the reset signal determination unit is determined to be a reset signal, the measurement unit transmits measurement information through the radio unit, and the measurement unit starts measurement of radiation in the next period. It shall be the radiological measurement system. When the reset signal is input through the wireless unit, the control unit includes an interval measurement timer unit that measures a time elapsed since the reset signal was previously input, and a period measured by the interval measurement timer unit. When the measurement period coincides, the measurement information obtained by the measurement unit is transmitted to the radio unit, and the measurement of the radiation dose in the next measurement period is started by the measurement unit. The radiation measurement system according to claim 1 . The control unit has an internal timer unit that measures a time elapsed since the measurement unit started measuring the radiation dose , and detects that the measurement period has ended by the internal timer unit; and When the reset signal is not input through the radio unit, the measurement unit obtains the measurement information obtained by the measurement unit through the radio unit and causes the measurement unit to start measuring radiation in the next measurement period. radiation measurement system of any crab according to claim 1 or claim 2. The control unit provided in a newly installed sensor device among the plurality of sensor devices,
When a reset signal is input through the wireless unit, an interval measurement timer unit that measures the time that has elapsed since the reset signal was previously input, and the time that has elapsed since the measurement unit started measuring the radiation dose And an internal timer unit
When an existing sensor device to be exchanged among the plurality of sensor devices transmits a reset signal, when the period measured by the interval measurement timer unit matches the measurement period, The measurement information obtained by the measurement unit is transmitted to the radio unit, and the measurement unit starts measurement of radiation dose in the next measurement period,
When the existing sensor device stops transmitting the reset signal, when the internal timer unit detects that the measurement period has ended, the measurement information obtained by the measurement unit is transmitted through the wireless unit. The radiation measurement system according to claim 1, wherein the measurement unit starts measurement of radiation in the next measurement period.