JPH0433380B2 - - Google Patents

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to an improvement in a scanning radiation detector that scans a predetermined range and detects the amount of radiation of a test object existing within the range, and further relates to More specifically, the present invention relates to a scanning radiation detector having a function of self-checking whether or not measurements are appropriate.

(Prior Art) Conventionally, radiation type detectors have been known that are capable of checking their operation. For example, in Japanese Patent Application Laid-open No. 53-68200,
A plurality of fire detectors as radiation type detectors are provided with a test light source as a check light source, and a control oscillator that controls energization of the test light source at a predetermined cycle and generates test light as a check light at a predetermined cycle, It is disclosed that an operational test is performed as a check for each fire detector by connecting it in parallel to a power supply via a common switch provided separately from the check light source of the fire detector and its control oscillator. There is.

In addition, Japanese Patent Application Laid-open No. 129894/1989 discloses a plurality of fire detectors each having a test lamp as a check light source, and a test method for generating simulated light that simulates the light generated in the event of a fire. In order to perform this test, the test lamp of each fire detector is sequentially lit after a rest period, and is equipped with a generating means for generating an intermittent response signal, and a discriminating device that receives the fire detection signal of each fire detector. A fire detector is disclosed.

(Problems to be Solved by the Invention) By the way, the system disclosed in JP-A-53-68200 is a system that checks multiple fire detectors individually, so it is difficult to check the operation of fire detectors. There are disadvantages that it requires a long time, and that the fire detector cannot perform fire detection measurements while the test light source is turned on.

Furthermore, when considered as a system, the system disclosed in JP-A-55-129894 performs operation checks while constantly detecting fire, but when focusing on individual fire detectors, This method has the drawback that the measurement period for fire detection must be used as the operation check period, and the fire detection measurement must be interrupted during the operation check interval.

(Object of the Invention) The present invention has been made in consideration of the above-mentioned circumstances, and its first object is to perform scanning radiation that can check its own operation while continuing measurement. It is in the place where the detector is provided.

A second object of the present invention is to provide a scanning radiation detector that can appropriately correct measurement results based on its own check results.

A third object of the present invention is to provide a scanning radiation detector that can determine whether or not measurements are being performed in an appropriate state based on the self-check results.

(Means for Solving the Problems) A first feature of the scanning radiation detector according to the present invention is that it includes a scanning section for scanning an object to be examined existing within a predetermined range, and the predetermined range. a light receiving section that receives emitted light from the object to be inspected within the predetermined range via the scanning section and converts it into a measurement signal; Emitting the check light so that the check light for obtaining a check signal for correcting the measurement signal is received by the light receiving part via the scanning part when the light is received by the light receiving part outside the scanning period. A scanning period by a check light source and the scanning section is defined into a measurement period for processing a measurement signal of the object to be inspected in synchronization with scanning and an interval period for processing for obtaining the check signal. The apparatus includes a definition circuit and an arithmetic processing section that corrects the measurement signal based on the check signal and calculates the radiation amount of the subject.

A second feature of the scanning radiation detector according to the present invention is that it includes a scanning unit for scanning an object to be examined within a predetermined range, and a scanning unit for scanning an object to be examined within a predetermined range; A light receiving unit that receives light through a scanning unit and converts it into a measurement signal; A calculation processing unit that calculates the radiation amount of the subject based on the measurement signal; and A processing unit that calculates the radiation amount of the subject based on the measurement signal. In order to obtain a check signal for checking, a check signal is sent to the light receiving section outside the scanning period in which the radiation light of the object to be examined existing within the predetermined range is received by the light receiving section via the scanning section. a check light source that emits the check light so that the light is received through the scanning section; and a measurement device that processes the measurement signal of the object to be inspected in synchronization with scanning during the scanning period by the scanning section. and a display circuit that determines whether or not the check signal is at a predetermined level and displays the determination result. It is in.

(Function) According to the first feature of the scanning radiation detector according to the present invention, the amount of radiation can be detected by correcting the measurement signal while continuing the measurement.

According to the second feature of the scanning radiation detector according to the present invention, it is possible to determine whether the measurement is being performed in an appropriate state based on the check signal while continuing the measurement.

(Example) Hereinafter, an example of a scanning radiation detector according to the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show the main part configuration of a scanning radiation detector for explaining an embodiment according to the first invention of the present application, and FIG. 4 shows a scanning radiation detector according to the first invention. This is a block circuit diagram of the signal processing section of a type radiation detector.
0 indicates the main body of the fire detector as a scanning radiation detector. The main body 10 includes a housing 12
, a support body 14 that rotatably supports the housing 12, and a base portion 16 that is fixed to a building structure.
It is made up of. The housing 12 has a hood 1
8, a shaft 20, and a bolt 22 are attached. The support body 14 is formed in a substantially U-shape, and the support body 1
4 has an insertion hole 24 and an arcuate guide groove 26 formed therein.

A shaft 20 fixed to the housing 12 is inserted into the insertion hole 24, and the bolt 22 passes through a guide groove 26 and is screwed onto the housing 12. It is in. The housing 12 is tilted vertically about a shaft 20 and adjusted, and is maintained at a predetermined angle with respect to the horizontal direction H by tightening bolts 22 after the adjustment.

The housing 12 is connected by a cable 28 to a signal processing section, which will be described later. As shown in an enlarged view in FIG. 2, this housing 12 includes a protective glass 34, a motor 38 for rotating a rotating mirror 36, an objective lens 40, a mirror 42, a slit plate 44 for limiting the field of view, and a relay lens 4.
6. A photoelectric conversion element 48 and an amplifier circuit 50 are built in, and an eyepiece lens 52 is provided. In addition, the code|symbol 32 is a motor for rotating the support body 10 in a horizontal direction.

The rotating mirror 36 functions as a scanning mirror that scans fires as objects to be inspected that exist within a range from short distances to long distances, and in FIG.
The range indicated by arrow A is the measurement area. Therefore, when the rotating mirror 36 scans the object to be inspected in the range indicated by the arrow A, the emitted light from the object to be inspected is guided to the photoelectric conversion element 48, and this range A corresponds to the measurement period, and the rotating mirror 36 When 36 is outside the scanning period in which the test object is scanned in the range indicated by arrow A, the check light is guided to the photoelectric conversion element 48, and this period corresponds to an interval period during which preparations for the next measurement are made. Protective glass 34, rotating mirror 36 and motor 3
8 constitutes a general scanning section. The photoelectric conversion element 48 functions as a light receiving section that receives the emitted light from the object to be tested and converts it into a measurement signal. Amplification circuit 5
0 has a function of amplifying the photoelectrically converted measurement signal. Further, the hood 18 serves to prevent the protective glass 34 from becoming dirty and to cut out external light.

As shown in FIG. 3, the housing 12 is provided with a light emitting element 54 as a check light source and a lens 56 for converting the check light emitted from the light emitting element 54 into a substantially parallel beam of light. The light emitting element 54 and lens 56 are housed in a housing 58 here, and the housing 58 is fixed to the upper part of the housing 12. The check light passes through the protective glass 34 through the through hole 60 of the hood 18, is reflected by the rotating mirror 36, and is guided to the photoelectric conversion element 48.
This check light is used to obtain a check signal for correcting a measurement signal (shown in FIG. 4), which will be described later.

A well-known rotating plate (not shown) having slits perforated in the circumferential direction is fixed to the output shaft 38a of the motor 38, and a light emitting element and a light receiving element (not shown) are mounted on the rotating plate. They are facing each other with a board in between. This rotating plate and a pair of light-emitting/light-receiving elements are used to obtain a measurement signal (see Figure 4), and this measurement signal is output once every half rotation of the rotating plate, as shown in Figure 5. It is. This synchronization signal is input to a control calculation section 62 having a function to be described later. The control calculation section 62 outputs a gate control signal based on the measurement signal. This gate control signal rises based on the rise of the synchronization signal, and falls after a certain period T. This gate control signal has a function of controlling gate control circuits 64 and 66. Here, the gate control signal is input to the gate circuit 64 as it is, and the gate control signal is inverted by the inverter circuit 68 and input to the gate circuit 66 as an inverted gate control signal.

Gate circuits 64, 66, inverter circuit 68
Together with the control calculation unit 62, the scanning period by the scanning unit is divided into a measurement period S for processing the measurement signal of the object to be examined in synchronization with the scanning and an interval period I for performing the processing for obtaining the check signal. The gate circuits 64 and 66 are connected to the amplifier circuit 5 via the cable 28.
Connected to 0. The gate circuit 64 has a function of allowing the measurement signal to pass toward the analog-to-digital converter 70 when the gate control signal is at a high level, and blocking the passage of the measurement signal when the gate control signal is at a low level. It has a function of allowing the check signal to pass toward the analog-to-digital converter 72 when the gate control signal is at a high level, and blocking the passage when the gate control signal is at a low level.

The analog-to-digital converter 70 has a function of digitally converting the measurement signal and outputting it to the control calculation section 62 as a digital measurement signal P _i , and the analog-to-digital converter 72 digitally converts the peak value of the check signal. digital check signal
It has a function of outputting data to the control calculation section 62 as _Pc . This control calculation section 62 exchanges information with a memory 74, and the memory 74 stores digital information corresponding to the peak level value of the check signal when the measurement is in a proper state. , the digital information is called out to the control calculation section 62 as the digital appropriate comparison signal _P0 every time the synchronization signal is input. The control calculation unit 62 calculates a correction coefficient _XL using the digital check signal P _c , the digital appropriate comparison signal P ₀ , and the calculation formula P _c /P ₀ , and calculates the radiation of the object to be tested from this correction coefficient _XL . This is to calculate the quantity P.

The calculation formula is P=X _L ·P _i .

The amount of radiation is displayed on the display 76 as a measurement result. In FIG. 4, reference numeral 78 is an operating section for scanning the control calculating section 62 to control the posture of the main body section 62 and other controls.

According to this device, since the check light is guided to the photoelectric conversion element 48 through the protective glass 34, a decrease in the amount of emitted light due to dirt on the protective glass can be corrected. In addition, since the check light is guided to the photoelectric conversion element 48 as a parallel light beam, the position where the image is formed on the photoelectric conversion element 48 becomes constant, which improves the accuracy of the check detection position of the scanning radiation detector itself. , reliability can be improved.

FIG. 6 shows the main part configuration of a scanning radiation detector for explaining an embodiment according to the second invention of the present application, and FIG. 7 shows a scanning radiation detector according to the second invention. This figure shows a block circuit diagram of the signal processing section of the device, and the same components as in the first embodiment are given the same reference numerals, and only the different structures will be explained.

In the embodiment according to the second invention, the light emitting element 54 and the lens 56 are provided separately and independently from the housing 12. The light emitting element 54 and lens 56 are used to obtain a check signal for checking whether the measurement is being performed in an appropriate state. The measurement signal and check signal are input to comparative examples 80 and 82 via gate circuits 64 and 66, respectively. comparison circuit 80,
82 receives reference signals ' and ' from reference signal generators 84 and 86, respectively. As shown in FIG. 5, the reference signal generator 84 generates a reference level _K1 corresponding to the fire level, which is set high when scanning a short distance and becomes lower as the distance increases. Has a function. Comparison circuit 8
0 outputs a fire discrimination output when the level of the measurement signal is higher than the reference signal level _K1 , so fire detection can be performed with the same level of sensitivity regardless of the distance to the fire. The reference signal generator 86 has a function of generating a reference signal' which changes into three reference levels _K2 corresponding to the highest, middle, and lowest levels of the reference signal' every time the interval period passes. On the other hand, the control calculation circuit 62 controls the brightness corresponding to the reference level K ₂ generated by the reference signal generator 86 (the higher the reference level K ₂ is, the brighter the object is as a nearby object;
If it is low, it is dark as it is a distant object) and the light emitting element 54
lights up. The comparison circuit 82 outputs a check appropriate signal when the peak level of the check signal is higher than the reference level _K2 , and outputs an inappropriate check signal when the peak level of the check signal is inappropriate.

Whether the measurement is appropriate or not is determined by a check appropriate signal and a check inappropriate signal from the control calculation unit 62.
is displayed on the display 76 by the control calculation unit 62, and each time the determination output is input to the control calculation unit 62, whether or not there is a fire is displayed on the display 76. .

According to this, the light emitting element 54 and the lens 56
Since these are provided separately and independently from the housing 12, it is possible to self-check changes in the posture of the housing 12. Furthermore, since the check light is guided to the photoelectric conversion element 48 through the protective glass 34, it is possible to check whether the protective glass 34 is dirty to the extent that it is not suitable for measurement.

Further, the reference signal 'of the reference signal generator 86 changes to three levels corresponding to the highest, middle, and lowest levels of the reference signal', and the light emitting element 54 corresponds to the reference level K ₂ of this reference signal'. Since the light is lit at a certain brightness, operation checks can be performed in accordance with the fire detection situation.

In addition, in the embodiment of the scanning radiation amount detector according to the second invention, the light emitting element 54 and the lens 56
Although the housing 58 for storing the above is provided separately from the housing 12, the housing 58 may be attached to the upper part of the housing 12 as in the scanning radiation amount detector according to the first invention. can. In addition, in the case of a separate and independent structure, the check light is guided to the rotating mirror 36 through the through hole 60, but instead of providing the through hole 60, the part where the through hole 60 is provided is covered with a transparent cover. , the check light shines onto the protective glass 3 from within the opening angle of the hood at a location that avoids the measurement area A.
It is also possible to adopt a configuration in which the light is incident on the rotating mirror 36 through 4.

In the above embodiment, the check is performed at each interval period, but the check may be performed at predetermined intervals or at a desired time.

In the above embodiments, a case where a scanning radiation detector is used as a fire detector has been described, but this scanning radiation detector can also be used as a heat material detector or a heat material position detector. By comparing the measurement signal and the check signal, the detection accuracy of the detector can be checked, and it can also be used to determine when to maintain the heat material detector and heat material position detector.

Furthermore, this scanning radiation detector can also be used for checking positional deviations and detecting vibrations in industrial robots.

(Effects of the Invention) As explained above, according to the first invention of the present application, it is possible to detect the radiation amount while continuing the measurement and adding correction to the measurement signal.

According to the second invention of the present application, it is possible to determine whether or not the measurement is being performed in an appropriate state based on the check signal while continuing the measurement.

Further, the first invention and the second invention have an effect that an operation check can be performed while continuing measurement.

[Brief explanation of drawings]

FIG. 1 is an external view showing the overall structure of a scanning radiation detector according to the first invention of the present application, FIG. 2 is a perspective view showing an enlarged internal structure thereof, and FIG. 3 is a sectional view thereof. FIG. 4 is a block circuit diagram of a signal processing section of a scanning radiation detector according to the first invention;
FIG. 5 is a timing diagram of the signal processing unit according to the first invention and the second invention, and FIG. 6 is a cross section showing the main part of the scanning radiation detector according to the second invention of the present application. 7 are block circuit diagrams of a signal processing section of a scanning radiation detector according to the second invention. 12...Housing, 18...Hood, 34...
... Protective glass, 36 ... Rotating mirror, 38 ... Motor, 48 ... Photoelectric conversion element, 54 ... Light emitting element, 56 ... Lens, 58 ... Housing, 62
... Arithmetic processing unit, 64, 66 ... Gate circuit, 7
6...Display device,...Measurement signal,...Check signal, S...Measurement period, I...Interval period.

Claims (1)

[Claims] 1. A scanning unit for scanning an object to be examined existing within a predetermined range; and a scanning unit for receiving emitted light from the object to be examined existing within the predetermined range through the scanning unit. a light receiving section that converts the measurement signal into a measurement signal; and a correction processing of the measurement signal when outside a scanning period in which emitted light from a test object existing within the predetermined range is received by the light receiving section via the scanning section. a check light source that emits a check light so that the check light for obtaining a check signal is received by the light receiving section via the scanning section; a definition circuit defining a measurement period for processing a measurement signal to be tested and an interval period for processing for obtaining the check signal; and correcting the measurement signal based on the check signal; A scanning radiation detector comprising: an arithmetic processing section that arithmetic-processes the radiation amount of the object to be inspected; 2. The scanning unit includes a rotating mirror for scanning;
and a protective glass disposed in front of the rotating mirror, wherein the check light emitted from the check light source passes through the protective glass, is reflected by the rotating mirror, and is guided to the light receiving section. A scanning radiation detector according to claim 1. 3. The scanning radiation detector according to claim 1, wherein the light flux of the check light is a substantially parallel light flux. 4 a scanning unit for scanning a test object existing within a predetermined range; and a light receiving unit for receiving emitted light from the test target existing within the predetermined range via the scanning unit and converting it into a measurement signal. a calculation processing section that calculates the radiation amount of the subject based on the measurement signal; and a calculation processing section that calculates the radiation amount of the subject based on the measurement signal; The light receiving section is configured to receive check light at the light receiving section during a period outside of a scanning period in which emitted light from an object to be inspected existing in the test object is received by the light receiving section via the scanning section. A check light source that emits a check light, and a scanning period by the scanning unit, a measurement period for processing a measurement signal of the object to be inspected in synchronization with scanning, and an interval period for processing for obtaining the check signal. and a display circuit that determines whether or not the check signal is at a predetermined level and displays whether or not the measurement is being performed in an appropriate state based on the determination result. Scanning radiation detector with. 5. The scanning unit includes at least a rotating mirror housed in a housing for scanning, and a protective glass disposed in the housing in front of the rotating mirror, and the check light source is configured to emit light from the check light source. 4. The scanning type scanning device according to claim 4, wherein the scanning type device is attached to the housing so that the check light transmitted through the protective glass is reflected by the rotating mirror and guided to the light receiving section. Radiation detector. 6. The scanning section includes at least a rotary mirror housed in the housing for scanning, and a protective glass disposed in the housing in front of the rotary mirror, and the check light source emits the check light. Claim 4, characterized in that the light beam is installed separately and independently with respect to the housing so that the light beam passes through the protective glass, is reflected by the rotating mirror, and is guided to the light receiving section. Scanning radiation detector. 7. Claims 4 to 6, characterized in that the light flux of the check light is a substantially parallel light flux.
A scanning radiation detector according to any one of the following clauses. 8. The check light source sequentially emits check light whose intensity corresponds to the distance to the subject, and the predetermined level is set sequentially according to the intensity of the check light. A scanning radiation detector according to claim 4.