JPH10162258A - Detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a reliable system by making the whole system simple and noise-resistant. SOLUTION: A vibration detection cable 2 is connected through vibration detecting and repeating parts 3 installed by sections of a protection fence 1, and the repeating parts 3 are connected to infrared-ray sensor repeating parts 6 to transmit information on trespass activity into the fence 1 detected by the cable 2 from the repeating parts 3 to the repeating parts 6, which transmit the information. Each repeating part 6 can transmit trespasser approach information to the infrared-ray sensor repeating part 6 of the following section under projection control by the reception interruption of infrared rays by a trespasser approaching the section.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to detecting a human or animal as an object to be detected inside or outside a predetermined area such as an off-limits area or a dangerous area, or detecting an intrusion of earth and sand or falling rocks and outputting an alarm. The present invention relates to a detection system using a sensor such as a vibration detection cable or an infrared sensor.

[0002]

2. Description of the Related Art When a vibration is applied, a sensor such as a vibration detecting cable for converting the vibration energy into electric energy is disposed on, for example, a fence or a wall installed in an off-limits area, and an intruder or an intruder enters. There is a detection system which can warn of this intrusion based on an electric signal from a vibration detection cable given by the action. When the cable length of such a vibration detection cable becomes long, the electric signal transmitted in the cable is attenuated to an undetectable level, the S / N ratio is reduced, and the electric noise is relatively increased. Cannot be detected.

[0003]

Therefore, it is conceivable to divide the vibration detection area into a plurality of sections and to install a vibration detection cable for each section. A communication path for aggregating signals from the cable and a control device to control it are required, but this complicates the overall system configuration, but if the installation distance of the vibration detection cable is increased, The result is an unreliable system that is susceptible to noise.

Further, in the conventional system, detection information when an intruder or an intruder is detected is transmitted using a dedicated signal line provided separately from the vibration detection cable. However, even in such a case, there is an influence of electrical noise on the signal line, and the signal line is installed separately from the vibration detection cable, which complicates the system configuration.

[0005]

According to the present invention, a detection area is divided into a plurality of sections, an infrared sensor relay section is provided for each section, and the infrared sensor relay sections in each section receive infrared light from each other. The above-described problem is solved by a configuration characterized in that transmission of predetermined information is enabled by controlling light emission.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a detection system according to the present invention will be described in detail with reference to the drawings.
As described with reference to FIG. 1, the detection system according to the embodiment of the present invention may be used as a detection area installed along both sides along a railway line, around a building, around a large site, or the like. The protective fence 1 is divided into a plurality of sections along its longitudinal direction, and a vibration detecting cable 2 as a vibration sensor is provided for each section. The vibration detection cable basically has a conductive core wire, a piezoelectric layer, a conductive shield layer, and an insulating outer coating layer. It is configured so that it can be converted into electrical energy and output as an electrical vibration detection signal. In the vibration detection cable 2 divided and installed in this manner, the section is appropriately set to a section having a length such that the degree of attenuation of the vibration detection signal transmitted through the vibration detection cable 2 does not affect the detection of this signal. In addition, the vibration detection relay unit 3 installed in each section can relay the vibration detection signal and transmit it to the control unit 7 side. Each of the vibration detection relay units 3 is individually connected to each of the infrared sensor relay units 6 via the transmission path 4 for each corresponding section. The infrared sensor relay section 6 has an infrared sensor 5 mounted thereon, and each of the infrared sensors 5 is opposed to the protective fence 1 at a predetermined distance from the protective fence 1 at a predetermined distance. Are supported by appropriate support means. Each of the infrared sensor relay sections 6 serves as the infrared sensor 5 in the section before the section of its own.
A structure for receiving the infrared light projected from the infrared sensor, and in response to the received light, the infrared sensor
It is also equipped with a structure that can emit infrared rays toward. The control unit 7 inputs the vibration detection signal from the vibration detection relay unit 3 and the infrared signal from the infrared sensor relay unit 6 as information relating to the intrusion of the detection target into the protective fence 1 and performs a process described later based on both information. A predetermined alarm operation can be performed.

In the detection system according to the embodiment of the present invention, an area for monitoring an intruder or an intruding object with respect to the protective fence 1 is divided into a plurality of sections as described with reference to FIG. In the vibration detection cable system, the vibration detection cable 2 is connected via a vibration detection relay unit 3 for each section, and also in the infrared sensor system, each of the infrared sensor relay units 6 in each section And is connected to each of the vibration detection relay units 3 via each of the transmission paths 4.

Here, the infrared sensor relay section 6 and the vibration detection relay section 3 will be described with reference to FIG. 3. The infrared sensor relay section 6 has a light receiving section 8, a microcomputer 9, and a light projecting section 10. , The vibration detection relay unit 3 is an amplifier circuit 11
, A filter 12 and a microcomputer 13. When the infrared sensor relay section 6 receives the infrared ray from the previous section side by the light receiving section 8, the microcomputer 9 drives the light projecting section 10 in response to the received light output, and
From the infrared. When a vibration detection signal is given from the vibration detection cable 2 in that section, the vibration detection relay unit 3 amplifies the signal with an amplifier circuit 11 and passes a frequency component specific to the vibration with a filter 12 to a microcomputer 13. Output. The microcomputer 13 of the vibration detection relay unit 3 is connected to the infrared sensor relay unit 6.
Is connected to the microcomputer 9 via the transmission path 4, the information such as intrusion into the protective fence 1 by the vibration detection by the vibration detection relay unit 3 is transmitted from the microcomputer 13 of the vibration detection relay unit 3 to the infrared sensor. The data is transmitted to the microcomputer 9 of the relay unit 3 via the transmission path 4. For example, if there is an intruding act between the infrared sensors 6 in the adjacent section, the infrared sensor relay unit 6 does not receive the infrared light by the light receiving unit 8, and the microcomputer 9 intrudes into the light emitting unit 10. When the vibration detection cable 2 vibrates due to an intruding action and the microcomputer 13 of the vibration detection relay unit 3 detects the vibration, the microcomputer 13 transmits the infrared sensor via the transmission path 4 to the infrared sensor. The information is transmitted to the microcomputer 9 of the relay unit 3. Then, the microcomputer 9 of the infrared sensor relay unit 3 controls the light emission of the light emitting unit 10 correspondingly. Therefore, the control unit 7 does not perform a direct intrusion such as shaking the protective fence 1, but performs an alarm in response to an intruder or an intruding object approaching the infrared sensor 5 and directly intrudes into the protective fence 1. Can respond to this alarm.

The control device 7 for performing such a control operation will be described with reference to FIG.
And a microcomputer 15 and an output device 16, and receives infrared rays from the infrared sensor
In accordance with the received light, the microcomputer 15 determines whether there is an intruder or an intruding object approaching the protection fence 1 and a warning whether there is a direct intrusion into the protection fence 1. In any case, the output device 16 can be driven to perform an alarm operation or the like.

The operation of the detection system having the above-described structure according to the embodiment of the present invention will be described with and without the intrusion of an intruder or an intruding object as a detection target into the protective fence 1. First, when there is no intruder or intruding object, each infrared sensor relay section 6 can receive infrared rays from the preceding section over all sections in the infrared sensor system, and this light reception causes the infrared sensor relay section 6 in the later section to receive the infrared rays. The infrared sensor relay unit 6 performs an infrared light receiving operation and a light emitting operation in response thereto in each section, and finally, the infrared light is incident on the control unit 7. In other words, information that there is no intruder or intruder in the section between the infrared sensor relay units 6 is transmitted to the control unit 7. In addition, since the vibration detection relay unit 3 in the vibration detection cable system does not receive the vibration detection signal from the vibration detection relay unit 3 in the previous section, the vibration detection relay unit 3 transmits the infrared sensor relay unit via the transmission path 4. Since no vibration detection signal is given to 6, the infrared sensor relay unit 6 does not perform the operation of projecting infrared rays with the vibration detection signal. It will be transmitted. As a result, the control device 7 determines that there is no intrusion into the protective fence 1 and does not output an alarm output.

First, an intruder approaches the protective fence 1 in an arbitrary first section of any of the sections, and an infrared ray from the infrared sensor 5 of the infrared sensor relay section 6 in front of the first section. Is blocked by an intruder, the first
In this section, the infrared sensor relay section 6 cannot receive the infrared light. Then, the infrared sensor relay section 6 in the first section stops emitting infrared light. As a result, the infrared sensor relay section 6 in each section stops the emission of infrared rays one after another because there is no reception of infrared rays, so that no infrared rays are incident on the control device 7. As a result, the control device 7 can detect that an intruder has approached the protective fence 1. However, in this case, since it is not possible to detect that the intruder has approached the protective fence 1 in any section, for example, the number of emitted and emitted infrared pulses is assigned to each section, for example, with a fixed short firing time. Any section i (i =
1, 2,..., N), the intruder approaches the protective fence 1 and the infrared sensor relay unit 6 in the section i is in the section i−
If the infrared ray from the first infrared ray cannot be received, the infrared ray sensor relay section 6 in the section i controls on / off of the infrared ray emitting operation to the light emitting section 10 by the microcomputer 9 so that the infrared ray pulse is emitted and emitted i times. If the i infrared pulses are transmitted to the control device 7 at the end, the control device 7 determines that the number of infrared pulses received by the light receiving section 14 is i.
5, it is possible to detect whether or not there has been an intrusion into the protection fence 1 in the section i, and to perform an alarm operation by driving the output device 15 based on the detection.

When a direct intrusion into the protective fence 1 occurs, a vibration detection signal is given to the vibration detection relay unit 3 from the vibration detection cable 2. Then, the microcomputer 13 of the vibration detection relay unit 3 transmits the information to the microcomputer 9 of the infrared sensor relay unit 6 via the transmission path 4. Accordingly, the microcomputer 9 of the infrared sensor relay unit 6 controls the light emission of the light emitting unit 10 to relay the infrared light having information corresponding to the fact that the protective fence 1 has been directly invaded by the infrared sensor. The information is finally transmitted to the microcomputer 15 via the light receiving unit 14 and transmitted to the control unit 7 so that the control unit 7 can issue an alarm for the intrusion.

In the above-described embodiment of the present invention, the vibration detection relay unit 3 transmits the vibration detection signal from the vibration detection cable 2 to the infrared sensor relay unit 6 via the transmission path 4. The vibration detection relay unit 3 may transmit the vibration to the control unit 7 via the vibration detection cable 2. That is, the vibration detection cable 2 may have an information transmission function in addition to the vibration detection function.

In the above-described embodiment of the present invention, in which section the intrusion has been performed is determined by the number of infrared pulses from the infrared sensor 5 of the infrared sensor relay unit 6. Instead of the number, the determination may be made by other methods such as the pulse width of the infrared pulse or the delay time of the infrared pulse.

[0015]

As described above, according to the present invention, the following effects can be obtained.

According to the first aspect of the present invention, the detection area is divided into a plurality of sections, and an infrared sensor relay section is provided for each section. Since the transmission of predetermined information is enabled by controlling the light emission, information can be transmitted without being affected by noise even if the detection area is long, such as a railway line. It will be expensive.

According to the second aspect of the present invention, in any one of the first to fourth aspects, the arbitrary infrared sensor relay section is configured such that infrared rays from the infrared sensor relay section in an earlier section are blocked by a detection target in the arbitrary section. When no light is received, the information on the detection target can be transmitted to the infrared sensor relay section in a later section by controlling the emission of infrared rays, so that intrusion into the detection target section can be reliably detected. It is easy to take measures against intrusions such as intruders and intruders.

According to the third aspect of the present invention, the infrared sensor relay section of each section, when a detection target is present in its own section, converts the infrared ray in a form unique to the arbitrary section into the infrared section of the section thereafter. Since the light is emitted to the sensor relay unit, it is possible to detect in which section the detection target has entered, so that it is easy to take measures for the entry.

According to the fourth aspect of the present invention, a vibration detection cable is connected via a vibration detection relay section provided for each section, and each of the vibration detection relay sections is connected to an infrared sensor relay section of a corresponding section. Connected separately to each other, and transmits information about the vibration detected by the vibration detection cable from the vibration detection relay unit to the infrared sensor relay unit, and the infrared sensor relay unit transmits information about this vibration. It is convenient because actions can be transmitted via the infrared sensor relay unit.

In the detection system of the present invention having the above-described configuration, the overall configuration is simple, an infrared sensor is used, and the vibration detection cable is divided in each section. It becomes less and has excellent noise resistance.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a detection system according to an embodiment of the present invention in an on-site construction state.

FIG. 2 is an equivalent circuit diagram of the detection system of FIG.

FIG. 3 is a circuit diagram of a vibration detection relay unit and an infrared sensor relay unit of FIG. 1;

FIG. 4 is a circuit diagram of a control unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Protective fence 2 Vibration detection cable 3 Vibration detection relay part 4 Transmission path 5 Infrared sensor 6 Infrared sensor relay part 7 Control part

──────────────────────────────────────────────────続 き Continued on front page (51) Int.Cl. ⁶ Identification code FI G08B 25/01 G08B 25/01 Z

Claims (4)

[Claims] 1. A detection area is divided into a plurality of sections, and an infrared sensor relay section is provided for each section, and each of the infrared sensor relay sections in each section is controlled by receiving and transmitting infrared rays to each other. A detection system characterized in that the transmission of the information of the user is enabled. 2. An infrared sensor relay unit, when the infrared ray from the infrared sensor relay unit in an earlier section is cut off by the detection target in the arbitrary section and is not received, the infrared sensor relay unit in the later section 2. The detection system according to claim 1, wherein the information on the detection target can be transmitted to an infrared sensor relay unit by infrared light projection control. 3. The infrared sensor relay section of each section, when a detection target exists in its own section, emits infrared rays in a form specific to the arbitrary section to the infrared sensor relay sections of sections thereafter. The detection system according to claim 2, wherein the detection system emits light. 4. A vibration detection cable is connected via a vibration detection relay section installed for each section, and each of said vibration detection relay sections is individually connected to each of the infrared sensor relay sections in the corresponding section. The detection system according to any one of claims 1 to 3, wherein information on vibration detected by the detection cable is transmitted from the vibration detection relay unit to the infrared sensor relay unit, and the infrared sensor relay unit transmits information on the vibration. .