JPH0133876B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intrusion monitoring device for detecting intruders in specific areas that require monitoring, such as oil plants, power generation substations, and bank premises, and particularly relates to improving the reliability of intrusion detection. .

This type of intrusion monitoring device has a configuration in which multiple sensors are installed outside or around a specific area including the outdoors to detect intrusion, and a display device that is activated by the signals from these sensors is installed in the monitoring room. There are many.

Sensors used for such purposes include those called light beam intrusion sensors that generate a signal indicating intrusion when the light beam is interrupted;
There are devices called vibration-sensing intrusion sensors that detect the vibrations of a fence set up in a specific area.

By the way, these sensors are selected so that they are not easily affected by weather conditions such as wind, rain, or snowfall, but even so, if snow accumulates up to the position of the light beam, or if the fence vibrates due to strong winds, these sensors may The sensor will malfunction.

However, with conventional intrusion monitoring devices, even if a malfunction of a sensor is predicted, there is no appropriate means to deal with it. I was in a situation where I had to rush. This not only increases security guard fatigue, but if this happens repeatedly, there is a risk that a real intrusion may be judged as a malfunction.
This had the disadvantage that the response was delayed.

The present invention has been made in order to eliminate the above-mentioned drawbacks, and by adding a means to substantially prohibit the operation of the sensor under conditions where the sensor is expected to malfunction, it is possible to improve the reliability of intrusion detection. The purpose of the present invention is to provide an intrusion monitoring device that can significantly improve performance and reduce the stress on security guards.

Hereinafter, one embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an example of the arrangement of sensors of an intrusion monitoring device according to the present invention, and shows buildings 1a, 1b and 1.
A fence 3 supported by pillars 2 is stretched around a monitoring area (also referred to as a specific area) including c. In reality, there are entrances and exits and places where it is almost impossible to enter and exit, but these are omitted to simplify the explanation. The monitoring area has an irregular rectangular shape as shown in the figure, and light beam type intrusion sensors (hereinafter referred to as light beam sensors) 4 are arranged at each corner of the outside of the fence 3, and the pillars 2 are A vibration sensing type intrusion sensor (hereinafter referred to as vibration sensing sensor) 7 is attached to each of them. In this case, a pair of light beam sensors 4 is provided for each of zones A, B, C, and D that are visible outside the fence 3.

Figure 2 is an enlarged perspective view showing the arrangement of each sensor when looking at the C zone from the outside.
A vibration detection sensor 7 is attached to the upper end of each of the C zones, and a light beam transmitter 5 is installed on the right side of the C zone in the drawing (hereinafter, ``in the drawing'' is omitted).
On the left side of the C zone, a light beam sensor 4b including a light beam receiving section 5R and a light beam transmitting section 6S is provided.

As shown in FIG. 3, the vibration sensing sensor includes a pair of electrodes that are filled with mercury 7b up to approximately the middle of the glass bulb 7a, and that penetrate through the glass bulb 7a and have their tips close to the mercury surface. 7c and 7d are used, and all the columns attached to the other columns except the left end column are connected in series.
Both ends thereof are connected to a power source via a current detection element (not shown) or the like. In this case, a capacitor (not shown) is connected between both ends to prevent malfunction due to slight vibrations of the fence 3.

On the other hand, the light beam transmitter 5S and the light beam receiver 5R are provided at a position relatively close to the ground, and transmit and receive the light beam 5L substantially parallel to the ground, and the light beam transmitter 6S and the light beam receiver 6
R is provided above and relatively far from the ground, and transmits and receives a light beam 6L that is substantially parallel to the ground.

By the way, this light beam and fence 3 are
They are separated by a suitable distance L as shown.

Next, FIG. 4 shows an example of the configuration of a circuit for inhibiting the operation of an intrusion sensor in the intrusion monitoring device according to the present invention.

The operation prohibition circuit of this intrusion sensor is
Manual switch 11, 12, 1 corresponding to the zone
3, OR circuit 14, 15, 16, AND circuit 17,
18, 20, a timer 19, and a display device 21a, of which, at the input end of the OR circuit 14, a light beam receiver near the ground (corresponding to 5R in FIG. 2) and a manual switch 11 are connected to the OR circuit 14. 15
The input end of the OR circuit 16 is connected to a light beam receiver (corresponding to 6R in FIG. 2) located away from the ground and the manual switch 12, and the input end of the OR circuit 16 detects the current flowing through the vibration sensor 7. element (hereinafter referred to as
vibration detection sensor) and manual switch 13
are connected to each other. Also, AND circuit 1
Manual switches 11, 12 and 1 are connected to the input terminal of 7.
3 is connected. Further, the input terminal of the AND circuit 18 is connected to the output terminals of the OR circuits 14 and 15, respectively, and the output terminal of the AND circuit 18 is connected to the input terminal of the AND circuit 20 via a timer 19. In addition, an OR circuit 16 and an AND circuit 17
The output terminal of is also connected to the input terminal of the AND circuit 20,
The output terminal of this AND circuit 20 is connected to the intrusion indicator 21a of the A zone.

On the other hand, circuits having the same configuration as those described above are provided corresponding to the B zone, C zone, and D zone, respectively, and the intrusion indicators for each zone are shown as 21b, 21c, and 21d, respectively.

Next, each zone will be provided with
The output terminal of the OR circuit 14 is connected to the input terminal of the counter 22, the output terminal of the OR circuit 15 is connected to the input terminal of the counter 23, and the output terminal of the OR circuit 16 is connected to the input terminal of the counter 22.
4 input terminals, respectively. These counters 22 to 24 output an "H" signal when two or more of their four inputs become "H", and reset buttons 25, 26 and 27 are provided at their output terminals, respectively. It is connected.

On the other hand, common to the above zones A to D, a first weather condition detection device consisting of a snow sensor 41, constant setting switches 42 and 43, and comparators 44 and 45;
It is equipped with a second weather condition detection device consisting of an anemometer 51, constant setting switches 52, 53, and comparators 54, 55, and manual switches 32, 33, 34, and further includes signals of this weather condition detection device and the manual switch. AND to add as an operation prohibition signal
It includes a circuit 28 and OR circuits 29, 30, 31, and 39.

Here, the comparator 44 of the first weather condition detection device
A snow sensor 41 and a constant setting switch 42 are connected to the input terminal of the comparator 45, and a snow sensor 41 and a constant setting switch 43 are connected to the input terminal of the comparator 45. An anemometer 51 and a constant setting switch 52 are connected to the input terminal of the comparator 54, and an anemometer 51 and a constant setting switch 52 are connected to the input terminal of the comparator 55.
and constant setting switch 53 are connected. Further, the output end of the comparator 45 and the output end of the comparator 55 are respectively connected to the input end of the OR circuit 39.

On the other hand, the input terminal of the OR circuit 29 includes a manual switch 32, an output terminal of a comparator 44, and reset buttons 25 and 2.
6 and the output ends of the OR circuit 39 are connected to each other, and the output ends of the OR circuit 29 are connected to the above-mentioned A to D.
It is connected to the input end of an OR circuit 14 provided corresponding to the zone. Also, at the input terminal of the OR circuit 30, a manual switch 33, a reset button 26 and a
The output end of the OR circuit 39 is connected, and the output end is connected to the OR
It is connected to the input end of the circuit 15. moreover,
The input terminal of the OR circuit 31 is connected to the manual switch 34, the reset button 31, and the output terminal of the comparator 55, and the output terminal is connected to the input terminal of the OR circuit 16 provided corresponding to the above-mentioned zones A to D. has been done.

Note that the output terminals of the OR circuits 29, 30, and 31 are
It is connected to an input end of an AND circuit 28, and an output end of this AND circuit 28 is connected to an input end of an AND circuit 20 provided corresponding to the above-mentioned zones A to D.

Next, when any sensor detects an intrusion based on the output signal of the AND circuit 20 provided corresponding to each zone A to D, an OR circuit 35 is reset to notify the intrusion by sound. Button 3
6, R-S flip-flop 37 and bell 38
The output terminal of the AND circuit 20 is connected to the input terminal of the OR circuit 35, and the output terminal of the OR circuit 35 is connected to the S input terminal of the R-S flip-flop 37. ing. Further, a reset button 36 is connected to the R input terminal of the R-S flip-flop 37, and a bell 38 is connected to its Q output terminal.

The operation of the intrusion monitoring device configured as described above is as follows.
This will be explained in order by giving specific examples such as occurrence of intrusion and weather conditions.

(A) The lifeguard does not operate the manual switch, and
If there is an intrusion from Zone C under weather conditions where there is no risk of the sensor malfunctioning.

First, when a person approaches the fence 3, the light beams 5L and 6L emitted from the light beam sensors 4a and 4b installed in front of it are blocked, and the signals _C1 and _C2 become "H" for a short time. become,
As a result of being applied to the AND circuit 18 via the OR circuits 14 and 15, a signal that becomes “H” for a short time is applied to the timer 19. This timer 19 is
The "H" signal continues to be output at least for the time required for a person to climb up the fence 3 after blocking the light beam.

Next, when the person climbs on the fence, the fence 3 vibrates, and the vibration sensor 7 captures this, and the signal C ₃ becomes "H" and is applied to the AND circuit 20 via the OR circuit 16.

In this state, the output of the AND circuit 20 changes to "H", which causes the display 21c to operate and indicate that there has been an intrusion into the C zone.

On the other hand, since the output of the AND circuit 20 is also applied to the S terminal of the R-S flip-flop 37 via the OR circuit 35, this is set
works.

At this point, the security guard presses the reset button 36 and presses the
-S When the flip-flop 37 is reset, the bell 38 will stop ringing, and then the security guard will rush to the spot and remove the intruder.

Note that the timer 19 assumes that an intrusion has occurred only when both the light beam sensor and the vibration sensor operate, and if either one operates, it is treated as a malfunction. It is set to an appropriate value depending on the distance L (FIG. 1) from the fence.

(B) When the sensor closest to the ground among the light beam sensors in the A zone fails under conditions where there is no risk of the sensor malfunctioning.

In this case, when the security guard closes the manual switch 11 corresponding to the A zone, an "H" signal is applied to the OR circuit 14. By this,
Optical beam sensor off the ground and fence 3
Intrusion detection is performed using a vibration sensor attached to the In other words, if there is an intrusion, a signal will be sent.
A ₂ and A ₃ become "H", and the same intrusion monitoring as described above is performed.

(C) When there is a lot of snowfall If there is snowfall, the snowfall sensor 41 detects this and applies a signal corresponding to the amount of snowfall to the comparator 44. On the other hand, the constant setting switch 42 applies a signal with a level corresponding to the position of the optical beam sensor near the ground to the comparator 44, and the comparator 44 compares the two, and when the value of the snow sensor 41 is large, the signal is "H". ” signal is output. By this A~D
The output of the OR circuit 14 provided corresponding to the zone becomes "H". Thus, operation of the light beam sensor and the vibration sensing sensor away from the ground is prohibited.

Further, the constant setting switch 43 applies a signal of a level corresponding to the position of the light beam sensor away from the ground to the comparator 45, and when the snow falls close to the level of this light beam sensor, the output of the comparator 45 becomes "H". "become. This signal is OR circuit 3
9 and 30, it is added to the OR circuit 15 provided corresponding to zones A to D. Thus,
The operation of both the upper and lower optical beam sensors is prohibited. Note that when the amount of snowfall becomes small, pressing the reset button 25 or 26 will return to the original state.

(D) When the wind is strong The constant setting switch 52 applies a signal to the comparator 54 at a level corresponding to the wind speed at which the optical beam sensor 4 is predicted to malfunction, and the constant setting switch 53 applies a signal to the comparator 54 when the vibration detection sensor 7 is A signal at a level corresponding to the wind speed predicted to cause a malfunction is applied to the comparator 55. Therefore, when the output signal of the anemometer 51 exceeds the output level of the constant setting switch 52, the output of the comparison circuit 54 becomes "H" and this signal corresponds to zones A to D via OR circuits 39 and 30. OR set as
Since it is added to circuit 15, operation of the light beam sensor away from the ground is prohibited. Also,
The output signal of the anemometer 51 is the constant setting switch 53
When the output level of the comparison circuit 55 is exceeded, the output of the comparison circuit 55 becomes "H", and this signal is applied via the OR circuit 31 to the OR circuit 16 provided corresponding to the A to D zones, thereby controlling the operation of the vibration sensor. is prohibited.

In this case, the output level of the constant setting switch 52 is higher than the output level of the constant setting switch 53, and when the comparator 54 outputs an "H" level signal, the output of the comparator 54 is also "H", As a result, intrusion detection is performed only by the light beam sensor close to the ground.

(E) When intrusion monitoring is canceled due to extremely bad weather conditions or special circumstances.

When the weather conditions are extremely bad, all the outputs of the weather condition detection device become "H", so the outputs of the OR circuits 29, 30, and 31 all become "H". Therefore, the output of the AND circuit 28 is “H”
and is set up corresponding to zones A to D.
The output of the AND circuit 20 is held at "L" and intrusion monitoring is stopped.

Furthermore, when intrusion monitoring is not to be performed due to special circumstances, intrusion monitoring is stopped in the same manner as described above by closing manual switches 32, 33, and 34.

(F) In the event of unforeseen circumstances, and (B) ~
If a condition not discovered under paragraph (D) occurs.

When multiple sensors operate, the counters 22, 2
3 and 24 operate, and their output becomes "H".
This inhibits sensor operation.

Although the present invention has been described above with reference to a preferred embodiment, the present invention is not limited to this embodiment, and may adopt various configurations shown below, for example.

(1) When an intrusion occurs, based on the output signal of the AND circuit 20, the location where the intrusion occurred is automatically displayed using an ITV, and this is recorded on a VTR.

(2) Record the location of the intrusion using a printer.

(3) When an intrusion occurs, the zone of occurrence is memorized, the intrusion is displayed based on this memorized value, and the memory is reset after appropriate processing is performed.

(4) The intrusion sensor may be an electric field type, a magnetic field type, a type based on image pattern recognition, a vibration sensor buried under the ground, a type using ultrasonic waves, etc., and the operation prohibition device must also be compatible with these types. Use.

(5) Detect weather conditions such as hail, rain, etc. in addition to snow and wind.

(6) As a display device, a suitable image may be projected on a CRT, or other display means may be used.

(7) The signal processing performed by the logic circuit shown in FIG. 4 is processed using a computer.

(8) Instead of snow sensors and anemometers, use data directly transmitted from weather stations.

(9) Instead of comparing the values of the snow sensor and anemometer with a comparator, use one that has a structure that outputs a signal when a certain value is exceeded.

(10) The insertion position of the manual switch is not limited to the position shown in FIG. 4, but may be inserted into the power supply circuit of the sensor, for example.

(11) When an entrance/exit is established in a specific area, it is possible to detect whether the person passing through the entrance is authorized to enter or exit, and to take measures to prevent the authorized person from being considered an intruder. take lessons.

(12) The optical beam sensors are not limited to two levels, upper and lower, but may be one level or three levels, depending on the importance of monitoring.

As described above, the intrusion monitoring device of the present invention detects an intruder into a specific area using a vibration sensing sensor and a plurality of light beam sensors that transmit and receive parallel light beams at different heights from the ground. At the same time, by providing a prohibition means that prohibits the operation of each sensor according to the level of weather conditions such as wind force and snowfall that is predicted to cause intrusion detection by each sensor to malfunction, it is possible to use sensors according to the level of weather conditions. Not only can this greatly improve the reliability of intrusion detection, but also significantly reduce the stress on security personnel.Especially when it is snowing, it is possible to monitor intrusions sequentially from optical beam sensors located above and below the ground depending on the snow level. Therefore, it is possible to select and utilize a light beam sensor according to the snow level.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the arrangement of sensors in an embodiment of an intrusion monitoring device according to the present invention, FIG. 2 is an enlarged perspective view showing the arrangement of sensors in the same embodiment, and FIG. FIG. 4 is a sectional view showing the structure of the main elements of the same embodiment, and FIG. 4 is a circuit diagram showing the structure of the signal processing section of the same embodiment. 1a, 1b, 1c: building, 2: pillar, 3: fence, 4: light beam type intrusion sensor, 7: vibration sensing type intrusion sensor, 11, 12, 13, 32, 33,
34: Manual switch, 14, 15, 16, 29,
30, 31, 35, 39: OR circuit, 17, 1
8, 20, 28: AND circuit, 19: Timer, 2
1a, 21b, 21c, 21d: display device, 2
2, 23, 24: counter, 25, 26, 27,
36: Reset button, 37: R-S flip-flop, 38: Bell, 41: Snow sensor, 42,4
3, 52, 53: Constant setting switch, 44, 4
5, 54, 55: Comparator, 51: Anemometer.

Claims (1)

[Claims] 1. As a sensor for detecting an intruder into a specific area including outdoors, a vibration sensor installed on a fence in the specific area, and a vibration sensor installed at a predetermined distance around the fence at a height above the ground. a plurality of light beam sensors that transmit and receive parallel light beams at different positions, and an operation that substantially prohibits the operation of each of these sensors depending on the weather condition level at which each of the sensors is predicted to malfunction. An intrusion monitoring device characterized by comprising: prohibition means. 2. The intrusion monitoring device according to claim 1, wherein a plurality of said sensors are arranged around a specific area, and a plurality of said operation inhibiting means are provided corresponding to each of these sensors. 3. The operation prohibition means includes a weather condition detection device that detects weather conditions such as snowfall amount and wind speed, and generates an operation prohibition signal when the weather conditions exceed a predetermined level, and a device that manually generates an operation prohibition signal. an intrusion monitor according to claim 1 or 2, further comprising a manual switch that generates an operation prohibition signal, and prohibits the operation of the sensor when either the weather condition detection device or the manual switch generates an operation prohibition signal. Device. 4. The intrusion monitoring device according to claim 1, wherein the sensor is provided for each zone obtained by dividing a specific area into a plurality of zones, and a plurality of the operation prohibiting means are provided corresponding to each of these zones.