JP4401232B2 - Intrusion detection system - Google Patents

Description

  The present invention relates to an intrusion detection system in which intrusion into a building or site is detected by a sensor, and this sensor detection is linked to a monitoring system using an ITV camera or the like.

  In recent years, with respect to prevention and detection of intrusions into buildings and premises, there has been an interest in conventional and new systems. Intrusion detection often involves linking a detection sensor with a monitoring system for reporting and confirmation.

As the detection sensor, a vibration sensor, an infrared cut-off sensor, an electric field sensor, a mechanical tension sensor, and a state variation sensor of a monitoring image by a monitoring monitor are known.
Furthermore, an optical fiber sensor using an optical fiber has been proposed (see, for example, Patent Document 1). This sensor detects whether the optical signal emitted from the optical fiber is reflected by the detection target (whether the detection target is at a predetermined position) as the presence or absence of the reflected light.
As a monitoring system linked with a detection sensor, there are known a system for recording an image by an ITV camera and a remote monitor, a system for performing image analysis, a system for generating an alarm by an alarm device, and a radio report.
Japanese Patent Laid-Open No. 2001-296111

In the intrusion detection system, the reliability differs depending on the degree of false detection of intrusion detection due to the relationship between the sensitivity of the detection sensor and the change in the external environment in which it is installed. If the system has many false alarms, the purpose of use cannot be achieved.
In addition, the intrusion detection system needs to maintain and manage its functions in a certain state, and a system with many maintenance points has a high running cost.

For these reasons, an intrusion detection system excellent in reliability and maintenance-free is desired.
Of these, in terms of reliability, the tension sensor method, which has the greatest track record, is recommended, but the conventional tension wire type is a component due to EMI (inductive failure) for its components, external environment, and aging. There is a need for replacement, and there is a need for improvement in terms of running costs and maintenance.

For maintenance-free systems, the monitoring system using ITV cameras is a system that is not easily affected by the external environment (wind, snow, temperature and humidity, electromagnetic fields, etc.). However, if the monitoring range is wide, install many ITV cameras. These image signals need to be transmitted over a wide range of signal cables to the central monitoring room, resulting in a large-scale system configuration.
In addition, the conventional detection sensor using an optical fiber cannot identify the intrusion location.
An object of the present invention is to provide an intrusion detection system that is excellent in reliability and maintenance-free and can also specify an intrusion location.

  In order to solve the above-described problems, the intrusion detection sensor includes an optical fiber detection sensor using an FBG (fiber Bragg grating) system and / or an optical fiber using an OTDR (optical time domain reflectometry) system. Using a detection sensor, link a monitoring system with an ITV camera connected to a transmission path with a network configuration such as a LAN, and arrange the signal transmission path of the ITV camera or the like in parallel to the sensor core of an optical fiber cable used for the detection sensor. Intrusion detection system that uses the core wire used for signal transmission, and further, an intrusion detection system that links an information communication system such as an IP telephone connected to a LAN or the like through a transmission path, and has the following configuration .

(1) An intrusion detection system that links an intrusion detection device and an ITV camera monitoring system to detect an intrusion into a monitoring area,
The intrusion detection device includes an optical fiber detection sensor using an optical fiber cable laid in a monitoring area as a transmission path for an intrusion detection member and an intrusion detection signal, and a light pulse is incident on the optical fiber of the detection sensor, and reflected light due to elongation strain of the optical fiber. And an intrusion detector that obtains an intrusion detection signal from
The monitoring system uses a core wire arranged in parallel to a sensor core wire of an optical fiber cable used for the detection sensor for signal transmission, and uses this signal transmission core wire to monitor a photographed image signal and a photographing control signal of an ITV camera. It is characterized in that it is configured to transmit to / from the room ITV control device.

  (2) The ITV control device automatically controls means for generating an alarm upon detection of intrusion by the intrusion detection device, means for projecting an image taken by the ITV camera on an ITV monitor, and automatically controlling the photographing state of the ITV camera. Or a means for manual control by an operation panel.

  (3) An IP telephone, a LAN terminal, a wireless LAN terminal, and at least a part of an Internet communication IP-BOX can be connected to the transmission path using the signal transmission core.

  (4) The detection sensor is an optical fiber detection sensor of an FBG method or an OTDR method that lays an optical fiber on an upper part of a fence in a monitoring area and detects an intruder trying to get over the fence.

  (5) The detection sensor may be an optical fiber detection sensor based on an OTDR method or an FBG method that lays in a zigzag manner along the fence and detects an intruder trying to break the fence.

  (6) The detection sensor is locked inside the manhole cover inside the manhole cover, lays the optical fiber cable, and detects the intruder trying to open the manhole cover using the FBG method or the OTDR method. It is characterized by being a sensor.

  (7) The detection sensor is locked to the pit lid in the power / communication cable pit in the management area, the optical fiber cable is laid, and an intruder trying to open the pit lid or a small animal has broken the optical fiber cable An optical fiber detection sensor using an FBG method or an OTDR method for detecting the above.

  As described above, according to the present invention, an optical fiber detection sensor using the FBG method and / or an optical fiber detection sensor using the OTDR method is used, and a monitoring system using an ITV camera connected to the transmission line by a LAN or the like is linked to the LAN. In order to create an intrusion detection system that uses a fiber optic cable core wire that uses a transmission line such as a detection sensor, only the fiber optic cable and ITV camera are exposed to the external environment. Eliminates EMI problems and is highly reliable and maintenance-free. In addition, running costs can be greatly reduced by making maintenance free. In addition, system construction costs can be greatly reduced.

In addition, the present invention provides an intrusion detection system in which an information communication system such as an IP phone connected via a transmission line via a LAN or the like is linked, so that intrusion detection linked with a monitoring center or other monitoring mechanism can be quickly and easily performed. Therefore, the reliability of the monitoring system can be further enhanced.
In particular, in the case of an optical fiber detection sensor using the FBG method, by providing a plurality of FBGs with different reflection wavelengths on one optical fiber, intrusion detection can be performed at each location, so a single optical fiber cable can be used even in a wide monitoring area. Intrusion detection can be performed at multiple locations that specify the intrusion location.

  FIG. 1 is a schematic configuration diagram of an intrusion detection system showing an embodiment of the present invention, which detects an intruder who tries to get over a fence in a site and further detects an intruder who tries to destroy the fence. is there.

  As the detection sensors, there are provided an FBG optical fiber detection sensor 1 and an OTDR optical fiber detection sensor 2 which use an optical fiber laid in a monitoring area as an intrusion detection member and an intrusion detection signal transmission path.

  FIG. 2 illustrates in principle the optical fiber type detection sensor 1 based on the FBG method. As shown in the figure, grating portions 101 having different fiber glass refractive indexes are provided in the cross-sectional direction of the optical fiber 100 at regular intervals. The grating unit 101 resonates and reflects only the wavelength component twice the interval λL of the pulsed light incident from the optical pulse generator 103. Utilizing the fact that the wavelength of the reflected light is shifted in proportion to the amount of elongation distortion of the grating unit 101, the reflected light is derived by the half mirror 103 and further detected by the light receiver 105 through the narrow-band variable filter 104. Thus, it is possible to detect whether or not the elongation strain amount of the optical fiber exceeds a certain value from the degree of wavelength shift.

  In this embodiment, as shown in FIGS. 1 and 3, the optical fiber type detection sensor 1 is laid on the upper part of the fence, and when an intruder touches or steps on the optical fiber, the elongation distortion of the grating unit 101 in FIG. The occurrence of an intruder is detected using the fact that this appears as a wavelength shift.

  FIG. 4 illustrates in principle the optical fiber type detection sensor 2 based on the OTDR method. An optical fiber has a portion with a different optical refractive index inside, and when the light passes through this portion, the light is refracted and scattered due to the difference in refractive index, and light having the same wavelength as the incident light is reflected to the incident end. Come. The detection sensor 2 uses this Rayleigh scattered light, enters the optical fiber 107 from the optical pulse generator 106, derives the Rayleigh scattered light by the half mirror 108, receives the light by the light receiver 109, and the amount and reflection time of this light. Therefore, it is possible to detect the distortion and displacement of the optical fiber, and also the disconnection position.

  In this embodiment, as shown in FIGS. 1 and 3, the optical fiber detection sensor 2 is laid in a zigzag along the fence, and when an intruder tries to break the fence, the optical fiber 107 of FIG. Detection of intruder occurrence and intrusion position by distortion, displacement or disconnection.

FIG. 3 shows the overall configuration of the intrusion detection system of the present embodiment, and each unit will be described below.
The monitoring room 3 has an ITV monitoring system as a central part, and is provided with information input / output means for detection and monitoring in cooperation with the detection sensors 1, 2 and the ITV camera.

Among these, the light detectors 4 and 5 are provided with a pulse generator for inputting a light pulse to the optical fiber type detection sensors 1 and 2, a light receiver for receiving a reflected wave from the optical fiber, and the like, as described above. A detection circuit based on the above is provided to obtain a detection output indicating that the intruder has tried to get over the fence or that the intruder has attempted to break the fence.
Since the intrusion detection device including these detection sensors 1 and 2 and the light detectors 4 and 5 uses an optical fiber as a signal transmission path, the light detectors 4 and 5 are installed in the monitoring room 3 and installed at a relatively long distance. Is possible. When the monitoring range is wide, it can be provided for each monitoring area divided into blocks.

  Next, the ITV control device 6 provided in the monitoring room 3 takes in the detection signals (including the intrusion position signal) of the photodetectors 4 and 5 as an interrupt signal through the interface 7, and further installs two units per block in the monitoring area. A monitoring video signal from the ITV camera 8 is received through the LAN, and an alarm display and its image display are performed on a plurality of ITV monitors 9.

  When receiving the intrusion detection signal from the intrusion detection device, the ITV control device 6 for linking these intrusion detection devices and the ITV equipment is optimal for each detection position in advance in order to identify the intrusion in parallel with the intrusion notification. An image is displayed on the monitor 9. As a result, the monitor can be provided with image information for making an accurate judgment on intrusion. Further, by including detection position information in the detection signal, the shooting direction of the two ITV cameras 8 is automatically directed to the detection position, and then the moving body tracking control (identification and movement of moving objects by image analysis) is performed. Even if the intruder moves from the detection position, the image on the ITV monitor 9 is not deviated.

  For example, in order to monitor the images of the ITV camera 8 installed at intervals of 200 m inside the warning area with a 14-inch monitor, a human image having a size of 2 cm or more is necessary on the screen. For this purpose, an ITV camera equipped with a zoom lens of 15 to 17 times is required. As a result, it is possible to recognize a person within a maximum monitoring distance range of 200 m. Under these conditions, the zoom and preset conditions of the ITV camera 8 are determined.

  Next, the ITV control device 6 has a function of taking in an operation signal generated by operation of a joystick or the like of the ITV operation panel 10 and controlling the ITV camera 8 (shooting direction, zoom, etc.) in accordance with this signal. With this function, it is possible to manually operate the ITV camera 8 by a supervisor when intrusion notification or the like, and to obtain a more appropriate monitor image.

  Further, the LAN that enables signal transmission between the monitoring room 3 and the ITV camera 8 at the monitoring site is used as an information transmission means, and the IP phone 11, the LAN terminal 12, the wireless LAN satellite 13, and the wireless LAN terminal 14 Communication, and also enables Internet communication through the IP-BOX 15 of the monitoring room.

Of these, IP phone 11 is connected to a connection port installed near the route of the monitoring area with a VoIP telephone using a modular cord, so that it is possible to call not only the monitoring room but also the monitoring center and system design company for patrol monitoring, etc. In addition, it is possible to support specialist engineers in system maintenance work. Similarly, the LAN terminal 12 has a built-in LAN (TCP / IP) and is connected to the connection port of the IP phone 11, thereby enabling transmission / reception of information from the location to a monitoring center, a security company, or the like. The wireless LAN terminal 14 can transmit and receive information via the wireless LAN satellite 13 installed near the route of the monitoring area, and is used for transmission and reception of maintenance information, monitoring information, and measurement information attached to the original operation of the intrusion detection system. To do.
As a connection port for connecting the IP phone 11 and the LAN terminal 12 to the LAN, for example, as shown in FIG. 1, a network BOX provided for each ITV camera can be used.

  In the system configuration as described above, the detection sensors 1 and 2, the ITV camera 8, the IP phone 11, etc. are connected to the monitoring room 3, the monitoring center, and other systems via the Internet to detect images, data, and detection. Information such as signals and audio signals is transmitted. In this embodiment, an optical fiber used for detection of intrusion by the detection sensors 1 and 2 is used as a transmission path for these information. Therefore, as an optical fiber cable used for the detection sensors 1 and 2, as shown in FIG. 5, in addition to the detection optical fiber core FD, the signal transmission core FS is arranged in parallel or individually in the optical fiber cable F. An optical fiber cable having a plurality of core wires is used, and the optical fiber cable is laid on the fence upper surface or the fence surface as shown in FIGS.

  Thereby, the optical fiber cable can use the core line FD as an optical transmission path for intrusion detection, and can use the core line FS as a LAN information transmission path in the ITV camera 8, the IP phone 11, or the like. This is advantageous in that the ITV camera and the IP phone are installed at a relatively long distance near the monitoring area, and it is not necessary to install a dedicated transmission line, and the reliability and maintenance-free of the intrusion detection system are improved. .

In the embodiment, the FBG type optical fiber detection sensor 1 and the OTDR type optical fiber detection sensor 2 are provided as detection sensors. However, when the monitoring area is a concrete wall or the like, only one of these sensors is provided. The installed intrusion detection system.
In the embodiment, the optical fiber detection sensor 1 may be an OTDR system, and the optical fiber detection sensor 2 may be an FBG system.

  The above embodiments show a case where an intruder detecting system that detects an intruder trying to get over the fence in the site and further detects an intruder trying to destroy the fence is installed. A system that detects the intrusion or destruction of humans and animals (small animals such as mice) via a manhole for power sewers and a power / communication cable pit can be constructed, or a system with an additional detection function can be constructed. .

FIG. 6 shows a detection sensor used for this intrusion detection system. FIG. 6 (a) shows a side sectional view of the manhole. An intruder opens the manhole cover 20 and enters a pipe rod (sewage, water, sinus, joint groove, etc.) 21 from that portion, and monitors it. 1 shows a configuration of a detection sensor for detecting an invasion into an area. An optical fiber cable 22 according to the FBG method or the OTDR method is laid along a pipe rod 21, and the optical fiber cable 22 is connected to a tension mechanism 23 or The holder 24 is locked inside the manhole cover 20.
With this configuration, when an intruder intentionally opens the manhole cover 20, an alarm detected on the monitoring room 3 side due to distortion or breakage of the optical fiber cable 22, and a photographed image of the manhole cover position by the ITV camera 8 can be obtained.

FIG. 6B shows a side cross-sectional view and a cross-sectional view of the power / communication cable pit for detecting that a person or a small animal tries to destroy the power / communication cable 25 in the cable pit. The configuration of the detection sensor is shown. The optical fiber cable 27 according to the FBG method or the OTDR method is laid along the cable pit 26, and the optical fiber cable 27 is locked inside the pit lid 29 by a holder 28 or the like.
With this configuration, when an intruder intentionally opens the pit cover 29, an alarm detected on the monitoring room 3 side due to distortion or breakage of the optical fiber cable 27, and a photographed image of the manhole cover position by the ITV camera 8 can be obtained. Further, when a small animal such as a mouse breaks the optical fiber cable 27, the breakage position can be detected from the reflected waves from the intrusion detectors 4 and 5 on the monitoring room 3 side even if the pit cover 29 is not opened. .

  The optical fiber cables 22 and 27 in FIG. 6 have the same configuration as that shown in FIG. 5 so that the core wire FD is used as an optical transmission path for intrusion detection and the core wire FS is used as the ITV camera 8. It can be used as a LAN information transmission path in the IP phone 11 or the like.

The schematic block diagram of the intrusion detection system which shows embodiment of this invention. FIG. 3 is a principle explanatory view of an FBG type detection sensor in the embodiment. The whole block diagram of the intrusion detection system by the detection sensor and ITV camera in embodiment. FIG. 3 is a diagram illustrating the principle of an OTDR detection sensor according to an embodiment. Sectional drawing which shows the core wire structure of the optical fiber cable in embodiment. Sectional drawing which shows the structure of the detection sensor for manhole tambours and cable pits in embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Optical fiber detection sensor by FBG method 2 Optical fiber detection sensor by OTDR method 3 Monitoring room 4, 5 Intrusion detector 6 ITV control device 8 ITV camera 9 ITV monitor 10 ITV operation panel 11 IP phone 12 LAN terminal 13 Wireless LAN satellite 14 Wireless LAN Terminal 15 IP-BOX
20 Manhole cover 21 Tube 22, 27 Optical fiber cable 25 Power / communication cable 29 Pit cover

Claims (7)

An intrusion detection system that links an intrusion detection device and an ITV camera monitoring system to detect intrusion into a monitoring area,
The intrusion detection device includes an optical fiber detection sensor using an optical fiber cable laid in a monitoring area as a transmission path for an intrusion detection member and an intrusion detection signal, and a light pulse is incident on the optical fiber of the detection sensor, and reflected light due to elongation strain of the optical fiber. And an intrusion detector that obtains an intrusion detection signal from
The monitoring system uses a core wire arranged in parallel to a sensor core wire of an optical fiber cable used for the detection sensor for signal transmission, and uses this signal transmission core wire to monitor a photographed image signal and a photographing control signal of an ITV camera. An intrusion detection system configured to transmit data to an ITV control device in a room.   The ITV control device includes a means for generating an alarm upon detection of intrusion by the intrusion detection device, a means for projecting an image taken by the ITV camera on an ITV monitor, and an automatic control or operation panel for the photographing state of the ITV camera. The intrusion detection system according to claim 1, further comprising a manual control unit.   3. The transmission path using the signal transmission core wire enables connection of at least part of an IP telephone, a LAN terminal, a wireless LAN terminal, and an Internet communication IP-BOX. Intrusion detection system.   4. The optical sensor according to claim 1, wherein the detection sensor is an optical fiber detection sensor based on an FBG method or an OTDR method that detects an intruder trying to climb over the fence by laying an optical fiber on the fence in the monitoring area. The intrusion detection system according to any one of the above.   The optical sensor according to any one of claims 1 to 3, wherein the detection sensor is an optical fiber detection sensor based on an OTDR method or an FBG method that detects an intruder trying to break the fence by laying in a zigzag manner along the fence. The intrusion detection system according to claim 1.   The detection sensor is an FBG or OTDR optical fiber detection sensor that detects an intruder trying to open the manhole cover by laying an optical fiber cable in the tube of the management area and locked inside the manhole cover. The intrusion detection system according to any one of claims 1 to 3.   The detection sensor detects that an intruder trying to open the pit cover or a small animal has broken the fiber optic cable by laying the optical fiber cable in the power / communication cable pit in the management area. The intrusion detection system according to any one of claims 1 to 3, wherein the intrusion detection system is an optical fiber detection sensor using an FBG method or an OTDR method.

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