JPH04167096A - Intrusion detection device - Google Patents

Abstract

PURPOSE:To flexible cope with the extension and reconstruction of a building and to facilitate the construction and maintenance by propagating laser light at the periphery of an intrusion monitor area, and judging whether or not there is an intrusion and its position from whether or not the laser light extracted by respective optical units is present or not. CONSTITUTION:The laser light outputted by a laser oscillator 40 is propagated at the periphery of the building 1 through plural reflection units 10-1, 10-2, 20-1, and 20-2. The laser light in this state which is cut off by an intruder is judged by a laser photodetector 41 and an intrusion judging circuit 44 to decide the intrusion and its position. Consequently, even when the building is extended or reconstructed, that can flexibly be coped with, the construction and maintenance are facilitated, and the cost is reduced, thereby realizing high-reliability intrusion detection.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to an intrusion detection device using laser light.

(Prior Art) There are various types of intrusion detection devices. Among these, there is a fence sensor method, which includes a trap type and a vibration type. In the trap type, a stress-sensing wire is stretched around a fence set around an intrusion monitoring area, and intrusion is detected from the stress of the stress-sensing wire. In addition, the vibrating type uses a vibration sensor attached to the fence to detect intrusion from the vibration.

However, with these methods, it is easy to misidentify due to the influence of snow and wind, and maintenance is difficult due to deformation of the fence.

Next is the infrared method, in which an infrared transmitter and its receiver are installed in the area to be monitored for intrusion, and intrusion is detected by cutting off infrared rays. However, this method is expensive, has low reliability, and requires installation space.

Next, there is a microwave system, in which a microwave transmitter and its receiver are installed in the intrusion monitoring area, and intrusion is detected by cutting off the microwaves. However, this method also has the same problems as the infrared method.

Next is the CCTV system, which detects intrusions by remotely controlling an image pickup tube to project the intrusion monitoring area on a monitor television. However, this method requires a monitoring person to watch the monitor television at all times.

Furthermore, in each of the above methods, if a building in the intrusion monitoring area is expanded or remodeled, the intrusion detection system cannot be flexibly adapted to the expansion or remodeling. In this case, construction and maintenance cannot be performed easily and costs are high.

On the other hand, there is an intrusion detection device that uses laser light.

FIG. 10 is a configuration diagram of such an intrusion detection device.

A He-Ne laser oscillator 2 and a photodetector 3 are provided in a part of the building 1 serving as an intrusion detection area. Also, each corner of the building 1 has a single reflection unit 4.5.
6 is placed. The position and reflection direction of each of these reflection units 4.5.6 can be adjusted.

With this configuration, the laser beam output from the laser oscillator 2 reaches the reflection unit 4 and is reflected, and is further reflected by each reflection unit 5.6 and enters the photodetector 3. If there is an intruder in the building 1 in this state, the laser light will be blocked, so by monitoring the output of the photodetector 3, it is determined whether there is an intruder.

However, although the above device can detect the presence or absence of an intrusion from any part of the building 1, it cannot determine the intrusion location at all.

(Problems to be Solved by the Invention) As described above, when a building is expanded or modified, it cannot be flexibly responded to, and construction and maintenance are difficult and costly. Also, the location of the intrusion cannot be determined at all.

Therefore, an object of the present invention is to provide a highly reliable intrusion detection device that can flexibly respond to the expansion and modification of a building, is simple in construction and maintenance, and can reduce costs, and can further identify intrusion locations. do.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides a laser oscillator and a laser beam outputted from the laser oscillator to transmit laser light around an intrusion monitoring area using optical units arranged around the intrusion monitoring area. a laser propagation means for transmitting the laser beam to the optical unit and extracting a part of the laser beam propagated between these optical units from each optical unit; This intrusion detection device attempts to achieve the above object by including an intrusion determining means for determining the presence or absence of intrusion into an intrusion monitoring area and the location of the intrusion.

(Function) By providing such means, the laser beam output from the laser oscillator is propagated around the intrusion monitoring area by the laser propagation means by each optical unit arranged around the intrusion monitoring area.

In this state, the intrusion determination means receives a portion of the laser beams extracted from each laser beam propagated between each optical unit, and determines whether or not there is an intrusion into the intrusion monitoring area and the intrusion position based on whether or not these laser beams are received. to decide.

(Example) Hereinafter, a first example of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram of an intrusion detection device. Each optical unit shown in FIGS. 2 to 4 is used in such a device. FIG. 2 shows a multi-reflection unit 10, which has a half mirror 11 and a reflection prism 12 that are movable in the XY-axis directions and rotatable in the arrow (a) direction. However, when the laser beam is incident, this laser beam is split into two directions by the half mirror 12, one of the laser beams is sent in a direction according to the arrangement angle of the half mirror 12, and the other laser beam L2 is reflected. The laser beam is sent through the prism 1 in a direction opposite to the propagation direction of the laser beam.

Next, FIG. 3 shows a multi-reflection unit 20 having another configuration, in which a half mirror 21 and a reflection mirror 22 are arranged at different angles. These mirrors 21 and 22 are movable in the XY-axis directions and rotatable in the directions of arrows (b) and (c). However, when the laser beam is incident, this laser beam is split into two directions by the half mirror 21, one of which, the laser beam L3, is sent in a direction according to the arrangement angle of the half mirror 12, and the other laser beam L4 is reflected. The laser beam is reflected by the mirror 22 and sent in a direction different from the propagation direction of the laser beam.

Next, FIG. 4 shows a single reflection unit 30, which is composed of a reflection prism 31.

Returning to Figure 1, building 1 has four sides A1BSC.
,D. A He-Ne laser oscillator 40 and a laser light detector 41 are provided at a corner formed by each side A1D of this building 1. Further, a plurality of reflection units 10-1 are arranged at the corners formed by each side ASB of the building 1, and a plurality of reflection units 10-1 are arranged at the corners formed by each side B, , C.
-2 is placed. Furthermore, each side ASB of building 1
, a plurality of reflection units 20-1, 20-2 are arranged at each corner of each side CSD. Each single reflection unit 4 is located at the corner of each side A and D of the building 1.
2.43 is located.

The laser light detector 41 includes multiple reflection units 10-1.
It has a function of receiving each laser beam from 20-1 and each single reflection unit 42, 43 and converting it into an electric signal. Specifically, it is composed of a phototransistor, a PSD, a quadrant detector, and the like.

The intrusion determination circuit 44 has a function of receiving electrical signals from the laser light detector 41 and determining the presence or absence of an intruder and the position of the intrusion based on whether or not a laser beam is received.

With this configuration, the laser light a output from the laser oscillator 40 propagates along the side A of the building 1 and enters the multiple reflection unit 10-1. This multiple reflection unit 1
0-1 branches the laser beam a into two directions, outputs one of the laser beams along the side B of the building 1, and sends the other laser beam g to the laser beam detector 41.

One laser beam propagates along the side B of the building 1 and enters the multiple reflection unit 10-2. This multiple reflection unit 10-2 branches the laser beam into two directions, outputs one of the laser beams C along the side C of the building 1, and outputs the other laser beam f in the propagation direction of the laser beam. return. This laser beam f enters a plurality of reflection units 20-1, is split into laser beams h1 to j by a half mirror 21 and a reflection mirror 22, and is sent to a laser beam detector 41.

The laser light C propagates along the side C of the building 1 and enters the multiple reflection unit 20-2. This multiple reflection unit 20-2 branches the laser beam C into laser beams d and e using a half mirror 21 and a reflection mirror 22. and,
These laser beams d and e are each sent to a single reflection unit 42.
．． 43 and enters the laser photodetector 41.

The propagation path of the laser beam is as explained above,
FIG. 5 schematically shows this propagation path.

The laser light detector 41 is a multiple reflection unit 10-1.20
-1 and each single reflection unit 42, 43 are received and converted into electrical signals. These electrical signals are sent to an intrusion judgment circuit 44, and this intrusion judgment circuit 4
4 receives these electric signals and outputs each laser beam gs hs i
The presence or absence of an intruder and the position of the intruder are determined from the presence or absence of light reception of sdse.

×: Light blocked ○: Light received The above table shows the intrusion position judgment logic stored in the intrusion judgment circuit 44. For example, when there is an intruder on side A of the building 1 and the laser beam a is blocked, each laser beam g s h s t enters the laser light detector 41.
The light reception level of s d Se is all "0". Thereby, the intrusion determination circuit 44 determines that there is an intruder on side A of the building 1.

Further, if there is an intruder on side C of the building 1 and the laser light C is blocked, the light reception level of each laser light d and e entering the laser light detector 41 becomes "0".

Thereby, the intrusion determination circuit 44 determines that there is an intruder on side C of the building 1. Further, if there is an intruder on side A of the building 1 and the laser light g is blocked, only the light reception level of the laser light g that enters the laser light detector 41 becomes "0". As a result, the intrusion determination circuit 44 detects the side A of the building 1.
determines that there is an intruder.

In this way, in the first embodiment, the laser oscillator 4
0 to each plurality of reflection units 10-
1.10-2.20-1.20-2, the laser beam is propagated around the building 1, and in this state, the intruder blocks the laser beam, which is judged by the laser light detector 41 and the intrusion judgment circuit 44, and the intruder is detected. Since the structure is configured to determine the presence or absence of the intrusion and the position of the intrusion, even if the building 1 is expanded or remodeled, each optical unit 10-
1, 10-2, . . . can be freely arranged according to the shape of the building 1 and can be handled flexibly, and there is no need for electrical wiring, so there is no need for construction work.

Moreover, since each optical unit 10-1, 10-2, . . . has a simple structure, maintenance is easy and costs can be reduced. Moreover, the installation space can be reduced. Furthermore, it is possible to determine not only whether there is an intrusion but also the location of the intrusion.

Next, a second embodiment of the present invention will be described with reference to the configuration diagram of FIG. 6.

A laser oscillator 5 is installed at the corner of each side E%H of the building 50.
1 and a laser photodetector 52 are provided. Further, a plurality of reflection units 10-3 and 10-4 are arranged at each corner of each side E and H1 of the building 50 and each side E and F, respectively. A single reflection unit 30 is arranged at a corner of each side GSH of the building 50.

With this configuration, the laser beam output from the laser oscillator 50 propagates along the side E of the building 50 and enters the multiple reflection unit 10-3.

This multiple reflection unit 10-3 branches the laser beam k into two directions, outputs one of the laser beams g along the side F of the building 50, and outputs the other laser beam m in the propagation direction of the laser beam. return. As a result, the laser light m is transmitted to the laser light detector 52.
incident on .

One laser beam g propagates along the side F of the building 50 and enters the multiple reflection unit 10-4.

This multiple reflection unit 10-4 branches the laser beam Ω into two directions, outputs one of the laser beams n along the side G of the building 50, and outputs the other laser beam 0 in the propagation direction of the laser beam g. return. This laser beam 0 is reflected by the half mirror 12 of the multiple reflection unit 10-3 and enters the laser beam detector 52.

Further, one laser beam n propagates along the side G of the building 50 and is reflected by the single reflection unit 30. Then, this reflected laser light p is reflected by each half mirror 12 of each of the plurality of reflection units 10-4 and 10-3 and enters the laser light detector 52.

In this state, for example, if there is an intrusion on the side E of the building 50 and the laser beam k is blocked, all the laser beams m, o, p entering the laser light detector 52 are blocked. Further, when the laser beam n is blocked by an intrusion on the side G of the building 50, the laser beam p entering the laser light detector 52 is blocked. Accordingly, the presence or absence of an intruder and the intrusion position thereof are determined based on the presence or absence of the laser beams m1o and p that are incident on the laser light detector 52.

As described above, according to the second embodiment, the same effects as those of the first embodiment can be achieved. Moreover, in the second embodiment, each of the laser beams m and oSp on the return path is replaced by each laser beam k on the outgoing path.
By propagating it close to zDsn, the laser light o1p can be blocked by, for example, entering the side F of the building 50. This makes it easy to determine the intrusion position.

Note that the present invention is not limited to the above embodiments, and may be modified without changing the gist thereof. For example, the entire intrusion detection device may be configured as shown in FIG.

Each optical unit as shown in FIGS. 2 to 4 is arranged around the monitored objects 60, 61.
It is being propagated around 62. Further, each of the plurality of reflection units 64, 65 has a function of sending each laser beam from the monitoring object 60, 61 to the laser light detector 66, and also sending it to the next monitoring object 61, 62.

With this configuration, it is possible to monitor intrusion into each monitoring target 60, 61, and 62.

Further, the propagation of the laser light to the laser light detector 41 may be converted into an electrical signal by a photoelectric conversion element 70 and sent to the intrusion determination circuit 44, for example, as shown in FIG. 8, without passing through each optical unit. Further, in this case, the light may be sent to the laser light detector 41 using the optical fiber 71.

Furthermore, the laser beam may be propagated so that the intrusion detection position can be performed above the building 1.

[Effects of the Invention] As described in detail above, the present invention can flexibly respond to the expansion and modification of buildings, is simple in construction and maintenance, and reduces costs, and is highly reliable in that it can identify intrusion locations. A sexual intrusion detection device can be provided.

[Brief explanation of the drawing]

1 to 5 show a first intrusion detection device according to the present invention.
FIG. 1 is a diagram for explaining an embodiment, and FIG. 1 is a configuration diagram;
Figures 2 to 4 are configuration diagrams of the optical unit, Figure 5 is a schematic diagram of the laser beam path, Figure 6 is a configuration diagram of the second embodiment of the device of the present invention, and Figure 7 is the construction of the intrusion detection device. FIGS. 8 and 9 are diagrams showing modifications, and FIG. 10 is a configuration diagram of a conventional device. 1.50...Building, 10-1.10-2゜10-3
．． 10-4...Multiple reflection unit, 20-1.20-
2... Multiple reflection unit, 30... Single reflection unit, 40.51... Laser oscillator, 41.52...
Laser photodetector, 42.43...single reflection unit,
44...Intrusion judgment circuit. Applicant's representative Patent attorney Takehiko Suzue Figure 2 I0 Figure 3 Light Figure 4 Figure 5 h Figure 9 Figure 10

Claims (1)

[Claims] a laser oscillator, and a laser beam output from the laser oscillator that propagates around the intrusion monitoring area by each optical unit disposed around the intrusion monitoring area, and propagates from each optical unit between these optical units. a laser propagation means for extracting a part of the laser beam, and receiving each laser beam extracted from each of the optical units, and determining whether or not there is an intrusion into the intrusion monitoring area and the position of the intrusion based on whether or not these laser beams are received. An intrusion detection device characterized by comprising an intrusion determination means.