Intrusion detection system

The present invention relates to an intrusion detection system in which an intrusion into a building or a 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, there has been interest in well-known and new systems for preventing and detecting intrusion into buildings and premises. 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 blocking sensor, an electric field sensor, a mechanical tension sensor, and a state variation sensor of a monitoring image by a monitoring monitor are known. Further, an optical fiber sensor using an optical fiber has been proposed (see, for example, Patent Document 1). This sensor detects whether or not the optical signal emitted from the optical fiber is reflected by the detection target (whether or not 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, a method of recording an image with an ITV camera and a remote monitor, a method of performing image analysis, a method of generating an alarm by an alarm, and a method of wirelessly reporting are known.<patcit num="1"><text>Japanese Unexamined Patent Publication No. 2001-296111</text></patcit>

<p> In the above-mentioned intrusion detection system, the reliability differs depending on the degree of intrusion detection false alarm due to the relationship between the sensitivity of the detection sensor and the change in the external environment in which the detection sensor 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 incurs a large running cost.</p><p> For the above reasons, an intrusion detection system with excellent reliability and maintenance-free is required. Of these, in terms of reliability, the tension sensor method, which has the most achievements, is recommended, but the conventional tension wire type is a component due to EMI (inductive interference), external environment, and aging for its components. It needs to be replaced, and it has been said that improvements are needed in terms of running costs and maintenance.</p><p> For maintenance-free, the ITV camera monitoring method will be a system that is not easily affected by the external environment (wind and snow, temperature and humidity, electromagnetic fields, etc.), but if the monitoring range is wide, a large number of ITV cameras will be installed. It is necessary to transmit these image signals with a signal cable laid over a wide area to the central monitoring room, which results in a large-scale system configuration. In addition, the conventional optical fiber detection sensor could not identify the intrusion location. An object of the present invention is to provide an intrusion detection system which is excellent in reliability and maintenance-free and can identify an intrusion location.</p>

<p> In order to solve the above-mentioned problems, the present invention uses an optical fiber detection sensor based on the FBG (fiber bragg grating) method or / and an optical fiber based on the OTDR (optical time domain reflection) method as the intrusion detection sensor. A detection sensor is used, and a monitoring system using an ITV camera connected to the transmission line in a network configuration such as LAN is linked, and the signal transmission line of the ITV camera is placed in parallel with the sensor core of the optical fiber cable used for the detection sensor. It is an intrusion detection system that uses the core wire to be used for signal transmission, and is also an intrusion detection system that links an information communication system such as an IP telephone connected to a LAN or the like via a transmission line. ..</p><p> (1) An intrusion detection system that detects intrusion into the monitoring area by linking an intrusion detection device and a surveillance system using an ITV camera. The intrusion detection device has an optical fiber detection sensor in which an optical fiber cable laid in a monitoring area is used as a transmission path for an intrusion detection member and an intrusion detection signal, and an optical pulse is incident on the optical fiber of the detection sensor to reflect light due to elongation distortion of the optical fiber. Consists of an intrusion detector that obtains an intrusion detection signal from The monitoring system uses core wires arranged in parallel with the sensor core wires of the optical fiber cable used for the detection sensor for signal transmission, and uses the signal transmission core wires to monitor the captured image signal and the captured control signal of the ITV camera. The feature is that it is configured to be transmitted to and from the ITV control device in the room.</p><p> (2) The ITV control device automatically controls a means for generating an alarm by detecting an intrusion by the intrusion detection device, a means for displaying a captured image of the ITV camera on an ITV monitor, and a shooting state of the ITV camera. Alternatively, it is characterized by being provided with a means for manual control by an operation panel.</p><p> (3) It is characterized in that at least a part of an IP telephone, a LAN terminal, a wireless LAN terminal, and an IP-BOX for Internet communication can be connected to a transmission line using the signal transmission core wire.</p><p> (4) The detection sensor is characterized in that an optical fiber is laid on the upper part of the fence in the monitoring area, and the optical fiber detection sensor is an FBG method or an OTDR method that detects an intruder trying to get over the fence.</p><p> (5) The detection sensor is characterized in that it is laid in a zigzag along the fence and is an optical fiber detection sensor by the OTDR method or the FBG method that detects an intruder trying to break the fence.</p><p> (6) The detection sensor is an optical fiber detection by the FBG method or the OTDR method that detects an intruder trying to open the manhole cover by laying an optical fiber cable by locking it inside the manhole cover in the pipe of the management area. It is characterized by being a sensor.</p><p> (7) The detection sensor was locked to the pit lid in the power / communication cable pit of the management area to lay the optical fiber cable, and an intruder trying to open the pit lid or a small animal damaged the optical fiber cable. It is characterized by being an optical fiber detection sensor based on the FBG method or OTDR method that detects.</p>

<p> As described above, according to the present invention, an optical fiber detection sensor by the FBG method or / and an optical fiber detection sensor by the OTDR method are used, and a monitoring system by an ITV camera connected to a transmission line by LAN or the like is linked to these, and further, LAN. Since the intrusion detection system uses the core wire of the optical fiber cable used for the detection sensor, only the optical fiber cable and the ITV camera are exposed in the external environment. It solves the problem of EMI, has excellent reliability, and is maintenance-free. In addition, the running cost can be significantly reduced by making it maintenance-free. In addition, the system construction cost can be significantly reduced.</p><p> Further, in order to provide an intrusion detection system in which an information communication system such as an IP telephone connected to a transmission line by LAN or the like is linked, the present invention quickly and easily performs intrusion detection in which information is linked with a monitoring center or another monitoring mechanism. This makes it possible to further improve the reliability of the monitoring system. In particular, when using an optical fiber detection sensor using the FBG method, by providing multiple FBGs with different reflection wavelengths on one optical fiber, intrusion detection can be performed for each location, so even in a wide monitoring area, a single optical fiber cable can be used. Intrusion detection can be performed at multiple locations where the intrusion location is specified.</p>

FIG. 1 is a schematic configuration diagram of an intrusion detection system showing an embodiment of the present invention, which is a system that detects an intruder trying to get over a fence on the premises and further detects an intruder trying to destroy the fence. is there.

As the detection sensor, an optical fiber detection sensor 1 by the FBG method and an optical fiber detection sensor 2 by the OTDR method, in which the optical fiber laid in the monitoring area is used as the transmission path of the intrusion detection member and the intrusion detection signal, are provided.

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

In the present 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 portion 101 of FIG. 2 is obtained. And this appears as a wavelength shift to detect the occurrence of an intruder.

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

In the present 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. 4 is installed. Detects the occurrence and intrusion position of intruders by distortion / displacement or disconnection.

FIG. 3 shows the overall configuration of the intrusion detection system of the present embodiment, and each part 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 detection sensors 1 and 2 and an ITV camera.

Of these, the photodetectors 4 and 5 are provided with a pulse generator that injects an optical pulse into the optical fiber type detection sensors 1 and 2 and a light receiver that receives the reflected wave from the optical fiber, as described above, and further receives a light receiving signal. A detection circuit based on the above is provided to obtain a detection output of an intruder trying to get over the fence or an intruder trying to destroy the fence. Since the intrusion detection device consisting of these detection sensors 1 and 2 and the photodetectors 4 and 5 uses an optical fiber as a signal transmission path, the photodetectors 4 and 5 are installed in the monitoring room 3 and laid over a relatively long distance. Is possible. Further, when the monitoring range becomes wide, it is possible to provide each block-divided monitoring area.

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 interrupt signals through the interface 7, and further installs two units per block in the monitoring area. The surveillance video signal from the ITV camera 8 is received through the LAN, and an alarm is displayed and its image is displayed on a plurality of ITV monitors 9.

When the ITV control device 6 for linking these intrusion detection devices and ITV equipment receives an intrusion detection signal from the intrusion detection device, it is optimal for each detection position in advance to identify the intrusion in parallel with the intrusion notification. Display the image on monitor 9. As a result, the observer can be provided with image information for making an appropriate judgment on intrusion. In addition, by including the detection position information in the detection signal, the shooting direction of the two ITV cameras 8 is automatically directed to the detection position, and the subsequent moving object tracking control (identification and movement of moving objects by image analysis) (Direction detection) does not deviate from the image on the ITV monitor 9 even if an intruder moves from the detection position.

For example, in order to monitor the images of ITV cameras 8 installed at intervals of 200 m inside the caution area with a 14-inch monitor, a person image with a size of 2 cm or more is required on the screen. For that purpose, an ITV camera equipped with a 15 to 17x zoom lens is required. This enables person recognition within a monitoring distance of up to 200 m. These conditions determine the zoom and preset conditions for the ITV camera 8.

Next, the ITV control device 6 has a function of taking in an operation signal generated by an operation of the joystick or the like of the ITV operation panel 10 and controlling the ITV camera 8 (shooting direction, zoom, etc.) according to this signal. This function enables the monitor to manually operate the ITV camera 8 when notifying an intrusion, and enables more accurate monitor image acquisition.

Furthermore, using LAN as an information transmission means that enables signal transmission between the monitoring room 3 and the ITV camera 8 at the monitoring site, the inside and outside of the IP phone 11, LAN terminal 12, wireless LAN satellite 13 and wireless LAN terminal 14 Communication is possible, and Internet communication is possible through IP-BOX15 in the monitoring room.

Of these, the IP phone 11 connects a VoIP specification telephone to a connection port installed near the path of the monitoring area with a modular cord, and enables calls not only to the monitoring room but also to the monitoring center and system design company during patrol monitoring, etc. It also enables the support of professional engineers in system maintenance work. Similarly, the LAN terminal 12 has a built-in LAN (TCP / IP) and connects to the connection port of the IP telephone 11 to enable transmission / reception of information from that location to a monitoring center, a security company, or the like. In addition, the wireless LAN terminal 14 enables transmission and reception of information via the wireless LAN satellite 13 installed near the path 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 telephone 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 above system configuration, the detection sensors 1 and 2, the ITV camera 8, the IP phone 11, etc. are used to detect images, data, and detection between the monitoring room 3 and the monitoring center, as well as other systems via the Internet. Information such as signals and voice signals is transmitted. As a transmission path for this information, in the present embodiment, an optical fiber used for intrusion detection by the detection sensors 1 and 2 is used. Therefore, as an optical fiber cable used for the detection sensors 1 and 2, as shown in FIG. 5, in addition to the optical fiber core wire FD for detection, the core wire FS for signal transmission is arranged in parallel or individually in the optical fiber cable F. Alternatively, or use an optical fiber cable with multiple cores, lay the optical fiber cable on the top of the fence or on the fence surface as shown in Fig. 1 and Fig. 3.

As a result, the optical fiber cable can use the core wire FD as an optical transmission line for intrusion detection and the core wire FS as a LAN information transmission line in the ITV camera 8 and the IP phone 11. This is convenient for installing ITV cameras and IP phones at a relatively long distance near the monitoring area, eliminating the need for a dedicated transmission line, and improving the reliability and maintenance-free of the intrusion detection system. ..

In the embodiment, the case where the optical fiber detection sensor 1 by the FBG method and the optical fiber detection sensor 2 by the OTDR method are provided as the detection sensors, but when the monitoring area is a concrete wall or the like, only one of these sensors is used. It is said to be an installed intrusion detection system. Further, 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 embodiment shows a case where the intrusion detection system detects an intruder trying to get over the fence on the site and further detects an intruder trying to destroy the fence, but it is laid inside and outside the site. It is possible to build a system that detects the intrusion or destruction of people or animals (small animals such as rats) through a manhole for sewage channels or a cable pit for power supply / communication, or a system with an additional detection function. ..

Figure 6 shows the detection sensor used in this intrusion detection system. (A) of FIG. 6 shows a side sectional view of the manhole, in which an intruder opens the manhole cover 20 and enters the pipe (sewage, clean water, cave, utility tunnel, etc.) 21 from that part and monitors it. The configuration of the detection sensor for detecting an attempt to enter the area is shown, and the above-mentioned FBG method or OTDR method optical fiber cable 22 is laid along the pipe 21, and the optical fiber cable 22 is used as the tension mechanism 23 or the tension mechanism 23. Lock the inside of the manhole cover 20 with the holder 24. With this configuration, when an intruder intentionally opens the manhole cover 20, it is possible to obtain 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.

(B) of FIG. 6 shows a side cross-sectional view and a cross-sectional view of the power / communication cable pit, and is used to detect a person or a small animal trying to destroy the power / communication cable 25 in the cable pit. The configuration of the detection sensor is shown, and the optical fiber cable 27 by 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 with a holder 28 or the like. With this configuration, when an intruder intentionally opens the pit lid 29, it is possible to obtain 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. Further, when a small animal such as a mouse damages the optical fiber cable 27, the damaged position can be detected on the monitoring room 3 side from the reflected waves of the intrusion detectors 4 and 5 even if the pit lid 29 cannot be 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 can be used as an optical transmission line for intrusion detection and the core wire FS can be used as the ITV camera 8. It can be used as a LAN information transmission line for IP phones 11 and the like.

<figref num="1">The schematic block diagram of the intrusion detection system which shows embodiment of this invention.</figref><figref num="2">The principle explanatory view of the FBG type detection sensor in an embodiment.</figref><figref num="3">The overall configuration diagram of the intrusion detection system by the detection sensor and the ITV camera in the embodiment.</figref><figref num="4">The principle explanatory view of the detection sensor of the OTDR method in embodiment.</figref><figref num="5">FIG. 5 is a cross-sectional view showing a core wire configuration of an optical fiber cable according to an embodiment.</figref><figref num="6">The cross-sectional view which shows the structure of the detection sensor for the manhole tambor and the cable pit in embodiment.</figref>

Code description

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 controller 8 ITV camera 9 ITV monitor 10 ITV control panel 11 IP phone 12 LAN terminal 13 Wireless LAN satellite 14 Wireless LAN terminal 15 IP-BOX 20 manhole cover 21 Ditch 22, 27 fiber optic cable 25 Power / communication cable 29 Pit lid