JP2006350727A - Light intrusion detection module and light intrusion detection system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for detecting the intrusion of an intruder or intruding object in an intrusion detection section. <P>SOLUTION: In a pair of erecting support for integrally forming parts erecting from a basic support 10 as shown in Fig.3(A), a light intrusion detection module is configured such that an optical fiber parallel converter A8 consisting of a fiber 6 and lens 7 is arranged at one erecting support A11 and an optical fiber parallel converter B9 is installed at another erecting support B12, and that the light exit of a light beam 1 in the converter A8 and the light receiver in the converter B9 are arranged so as to transmit and receive the light beam. By using the module, a light input unit 13 and output unit 14 of the module are connected with a light emission unit 2 and light receiver 3, respectively, by the optical fiber as shown in Fig.3(B). In such a system, when the light emission unit 2 is turned ON and the intruder intrudes in the module, the light beam 1 is intercepted and an electrical signal of intrusion detection is output from the light receiver, which achieves a light intrusion detection system. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  A light intrusion detection module that detects an intruder or an intruder using light beam blocking and a system that detects the intruder or the intruder using the module.

  As shown in FIG. 1, conventionally, a light emitter (electro-optical converter) 2 is installed in an intrusion detection space, and a light beam 1 emitted from the light emitter to the intrusion detection space is received at a detection site. (Photoelectric converter) 3 receives light, converts it into an electrical signal, and detects light blocking by ON / OFF. When it is desired to extend the section, a relay amplifier may be used as shown in FIG. See Patent Document 1

  There is an optical fiber parallel converter as a basic component constituting the light detection module of the present invention. Conventionally, as shown in FIG. 2, the optical fiber is composed of an optical fiber and a lens. The optical fiber parallel converter 8 converts the light transmitted through the optical fiber into a parallel light beam by the lens, and receives the parallel light beam. It is composed of an optical fiber parallel converter 9 that collects and guides light to each other, and is called an optical fiber collimator in pairs. Optical filters, optical isolators, optical attenuators, etc. are arranged by arranging optical functional elements such as filters, Faraday rotation elements, attenuators, etc. between the pair of optical fiber parallel converters, and controlling the passage of light beams. Basic optical parts are formed. The mechanism is composed of an optical fiber parallel converter 8, a parallel converter 9, and a light beam portion, and the three members are covered with a sheath (metal tube) 18. In addition, as shown in the figure, the optical fiber parallel converter includes a fiber and a lens as shown in the figure, and a tip spherical fiber that processes the tip of the fiber itself. The length of the optical fiber collimator is usually about several centimeters. Aiming for miniaturization. See Non-Patent Document 1.

Japanese Patent Laid-Open No. 6-6310 "Optical Information Industry and Advanced Technology" Engineering Books 1997

As shown in FIG. 1, a conventionally known interruption detection system has a light emitter 2 such as a laser installed at a detection site, and a light beam 1 emitted from the light emitter 2 to the interruption detection space is received by a light receiver 3. The light was received and converted into an electrical signal, and the presence or absence of the light beam 1 in the shielding detection section was detected based on the presence or absence of the electrical signal. In such a system, the light emitter 2 and the light receiver 3 which are active devices having a power source, a circuit, and the like are often installed on the outdoor field, and the installation cost of the power source, the location, the waterproofing, etc. It took time for "alignment work". These operations were greatly restricted by the external environment such as weather and traffic restrictions, and the costs were also increasing.
In addition, when the site is curved, the light beam goes straight, so it is necessary to individually install the light emitter 2 and the light receiver 3 along the bends. The alignment work increased and the cost increased.

As shown in FIG. 3 (A), the first of the solving means is that at least one pair of rising supports that form a rising integrally with the main support 10 is provided at intervals. One optical fiber parallel converter A8 comprising a fiber 6 and a lens 7 is installed on the rising support A11, and one optical fiber parallel conversion B9 is installed on the other startup support B12. The light intrusion detection module is characterized in that the light emitting part of the beam 1 and the light receiving part of the optical parallel converter B9 are arranged to transmit and receive the light beam.
Second, as shown in FIG. 3B, the optical input unit 13 and the light emitter 2 of the module, and the module light output unit 14 and the light receiver 3 are connected by optical fibers. In such a system, the light emitter 2 is turned on, and when an intruder enters the module, the light beam 1 is interrupted, and the electrical output of the light receiver is turned off to detect the presence of the intruder. Intrusion detection system. However, in the above system, when the light beam blocking time is short or when the light beam is partially blocked, the electrical output of the light receiver is detected as a pulse signal or a rectangular signal.

Advantages of the “light intrusion detection module” of the present invention (1) Conventionally, as shown in FIG. 1, it is necessary to install a light emitter and a light receiver at an intrusion detection site. The light intrusion module of the present invention can be assembled at a factory away from the detection site and installed at the site.
(2) For the above reasons, there is no optical axis alignment work on site, and the influence of the external environment such as weather and road regulations is reduced.

The effects of the “light intrusion detection system” of the present invention are as follows: (1) In the case of an intrusion detection space having a distance compared to the conventional system, this system requires a plurality of light intrusion detection modules, and is disadvantageous. Since there is no optical axis alignment work at the intrusion detection site, the interception detection system has a great effect of compensating for the disadvantages.
(2) Since it is not necessary to install the light emitter / receiver directly in the intrusion detection space, the place restrictions can be greatly reduced. In the conventional system, since the light emitter and the light receiver are active elements, it is necessary to install them mechanically and firmly in an environment-friendly place, and there are many restrictions such as power supply and ownership. The system of the present invention eliminates the disadvantages of the conventional system.
(3) In the conventional method, in the case of detection of interruption in a bending space, it is necessary to approximate the bent portion with a straight line from the straightness of the light beam, and each time a light emitter and a light receiver are installed on the site, Construction costs such as installation costs and optical axis alignment costs become enormous. This is solved by the present invention.

The effects of the multi-beam type “light intrusion detection module” of the present invention are as follows: (1) By changing from a single beam to a plurality of beams, an intruder or an obstacle can be caught in a plane, so that the single beam type light of the present invention is used. The detection accuracy is improved compared to the detection module. Compared with the conventional system, it is necessary to install as many emitters and receivers as the number of beams on the site, and it is necessary to install a single beam into multiple beams because of the above-mentioned site adjustment and site installation. It is not proportional and the disadvantages are great.
(2) The method of the present invention shown in FIG. 9 has the merit that each beam can be specified, and the conventional method and the light emitter receiver are the same, but the conventional method still solves the problem of site installation and adjustment. Not. However, FIG. 9 shows the case of a plurality of light emitters / receivers. However, as an alternative method, if a single light emitter / receiver is used in combination with multiple optical fiber branches, a plurality of light emitters / receivers are required. And not.

As shown in FIG. 3 (A), the first of the solving means is provided with at least one pair of rising supports that form a rising integrally with the main support, with one of them standing up. One optical fiber parallel converter A is installed on the lifting support A, and one optical fiber parallel converter B is installed on the other rising support B. The light beam emitting part and the optical fiber parallel conversion of the optical fiber parallel converter A are installed. The single-beam type light intrusion detection module is characterized in that the light receiving unit of the device B is arranged to transmit and receive a light beam. In addition, the optical input unit and the optical output unit are connected to the optical fiber of the optical fiber parallel converter by an optical connector, an adapter, or the like, and the optical fiber of the optical fiber parallel converter and the optical fiber for extraction are directly fused and connected. There are methods. Although FIG. 3A illustrates the case of a pair, a plurality of pairs may be used. Each light parallel converter, support, etc. also includes a waterproof structure.
As a second solution, as shown in FIG. 3B, the light input portion of the optical fiber parallel converter A of the light intrusion detection module is connected to the light emitter by an optical fiber. On the other hand, the light output unit of the optical parallel converter B and the light receiver are connected by an optical fiber. In such a system, the light-emitting device 2 is turned on, and when an intruder enters the module, the light beam 1 is cut off, and an electric signal for intrusion detection is output from the light-receiving device. .
If it is desired to extend the intrusion detection section, it can be solved by adding the module. Further, if it is desired to extend the detection section, it can be solved by adding a relay amplifier as in the prior art.

  FIG. 4 is a cross-sectional view when k is 3, which is a modification of the single-beam type light intrusion detection module described in (0010). From the figure, three optical fiber parallel converters A8 are arranged on the rising support A11, and three optical fiber parallel converters B9 are arranged on the rising support B12, and the optical parallel converters facing each other are arranged. Three pairs are combined so that A8 and parallel light converter B9 are paired. A three-beam type “light intrusion detection module” 16 is characterized in that each pair is fixed after alignment.

In the multi-beam type detection module described in (0011), when k is 3, as shown in FIG. 5, the input part of the optical parallel converter connected to the light emitter is used as the optical input of the multi-beam type light intrusion detection module. The output unit of the optical parallel converter connected to the optical receiver is referred to as a light output unit of the multi-beam type light intrusion detection module.
In the multi-beam type light intrusion detection module having the light input portions of the three light parallel converters A and the light output portions of the three light parallel converters B, one light input portion (one of the three light input portions) In the example, the first light input section) is connected to the light emitter by an optical fiber. The remaining two light input portions are connected by an optical fiber (in this example, the second light input portion and the third light input portion). On the other hand, except for the light output part (No. 1 light output part) of the light beam (A → B) from the optical fiber balanced converter A connected to the light emitter and the optical fiber toward the optical fiber balanced converter B The light output unit and the light receiver are connected by an optical fiber. A light beam (A → B) directed from the optical fiber balanced converter A connected to the light emitter to the optical fiber balanced converter B from the optical fiber balanced converter A, and a light directed from the second optical parallel converter B to the optical parallel converter A The beam (B → A), the third light beam (A → B), and the light parallel converter A and the light parallel converter B are alternately connected to the light receiver so as to pass all the light beams. Two output parts (in this example, the 1st light output part and the 2nd light output part) except the output part are connected with an optical fiber. In such a system, when the light emitter is turned on and an intruder enters the light beam of the multi-beam type light intrusion detection module, the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver. Features a light intrusion detection system.

  In the case where k described in (0011) and (0012) is 3, light in which a multi-beam type light detection module (hereinafter referred to as a three-beam type light detection module) is installed in m units (m is an integer of 2 or more) in series. The intrusion detection system will be described with reference to FIG. In FIG. 6, the light output portion of the starting three-beam optical fiber detection module (in this example, the third light output portion of the first light intrusion detection module) and the light of the next three-beam optical fiber detection module The input unit (in this example, the first optical input unit of the second light intrusion detection module) is connected by an optical fiber. The light output unit (third light output unit in this example) of the second three-beam type optical fiber detection module and the light input unit (first light input unit in this example) of the final three-beam type optical fiber detection module ) Are connected by optical fiber. Between the light emitter 2 and the light input part (first light input part in this example) of the three-beam type light detection module at the start end and the light output part (third light output in this example) of the terminal three-beam type light detection module Part) and the light receiver are respectively connected by optical fibers. In such a system, when the light emitter is turned on and an intruder in the light beam of the three light beam detection modules enters, the light beam is interrupted and an electrical signal for intrusion detection is output from the light receiver. Light intrusion detection system.

In the multi-beam type light penetration module described in (0013), an optical fiber detection system in the case where k is an even number will be described.
As shown in FIG. 7, when k is an even number of 4, one light input part (the first light input part in this example) of the four light input parts of the module and the light emitter are connected by an optical fiber. Has been. This optical input unit is referred to as the optical input unit of the module. On the other hand, one light input portion (fourth light input portion in this example) of the three light input portions excluding the light input portion of the module and the light receiver are connected by an optical fiber. This terminal is called an optical output unit of the module. The remaining two optical input units (second and third optical input units in this example) are connected by an optical fiber. On the other hand, as described in (0012), the first light beam (A → B), the second light beam (B → A), and the third light formed by the light input unit to which the light emitter is connected. Two pairs are selected from the four light output sections so that the light beam (A → B) and the fourth light beam (B → A) are alternately passed through all the light beams (1 in this example). No. 2, No. 2 light output part, No. 3 and No. 4 light output part), and these light output parts are connected by an optical fiber. In such a system, when an intruder enters the light beam of the multi-beam type light intrusion detection module with the light emitter turned ON, the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver. Light intrusion detection system.

In the multi-beam photodetection module described in (0014), an example is shown in which m multi-beam photodetection modules having an even number k (m is an integer of 2 or more) are installed.
As shown in FIG. 8, in the case where k is 4 and m is 3, from the first four-beam light detection module to the third four-beam light detection module, the light output unit of each light detection module And the optical input section of the next optical detection module are connected by optical fibers. One light input portion (first light input portion in this example) of the four light input portions of the light detection module at the start end and the light emitter are connected by an optical fiber. On the other hand, one light input portion (fourth light input portion in this example) of the three light input portions excluding the light input portion of the module and the light receiver are connected by an optical fiber. The remaining two light input portions are connected by an optical fiber. On the other hand, as described in (0012), the first light beam formed by the light input portion of the first light intrusion detection module connected to the light emitter and the output portion of the third light intrusion detection module. (A → B) Second light beam (B → A) formed by the output unit of the third light intrusion detection module and the light input unit of the first light intrusion detection module, and so on. Are alternately connected between the fourth light beam (B → A) formed by the first light input unit and the third light output unit connected to the light parallel converter A and the light parallel converter B. Moreover, two light output portions of the m-th light intrusion detection module (in this example, the first and second light output portions, the third and fourth light output portions) so as to pass all the light beams, Connected with optical fiber. In such a system, when an intruder enters the light beam of the multi-beam type light intrusion detection module with the light emitter turned ON, the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver. Features a light intrusion detection system.

When the k-beam type (k is an integer) photodetection module described in (0010) and (0011) is installed in m units (m is an integer), k light emitters, and k light receivers are installed. An example of a light intrusion detection system will be described.
As shown in FIG. 9, when k is 4 and m is 3, the light output part of the four-beam type light detection module at the start and the light input part of the second light detection module are respectively connected by optical fibers. The light output units and the input units of the second and third light detection modules are connected by optical fibers, respectively. Each optical input unit at the start end and the four light emitters are connected by optical fibers, respectively, and the optical output unit of the end photodetecting module and the four light receivers are connected by optical fibers, respectively. In such a system, when four light emitters are turned on and an intruder enters the light beam of any of the multi-beam type light intrusion detection modules, some or all of the light beams are blocked and enter from the light receiver. An optical intrusion detection system, wherein an electrical signal for detection is output. The method described above is for k light emitters and k light receivers. However, as an alternative method, one light emitter is distributed by an optical fiber k-branch, and one light receiver is optically connected. A method of collecting light with a fiber k branching device is also included in the present invention.

  FIG. 10 shows an embodiment. Three light intrusion modules 16 having a length (L) of 0.5 m and a rising height (H) of 0.1 m are appropriately installed in series, and these are connected by two 0.1 m optical cords 15. Each connected. Set the 1.3 micron light emitter 2 and light receiver 3, and each 1m optical cord 15 with the light input part of the first light intrusion detection module and the light output part of the third light intrusion detection module Connected to. Verification was performed by placing an intruder 19 having a height and width of 0.2 m on the second light intrusion detection module. As a result, the difference in light output level between when the intruder was placed and when it was removed was measured, and the measurement limit was 50 db or more. From this figure, it was confirmed that the system operates normally.

  The light intrusion detection module and the detection system of the present invention are used to detect intrusion into a train track in the transportation industry, safety devices such as revolving doors and automatic opening / closing shutters in the construction industry, and safety devices by mounting on a fender of an automobile industry car There is a possibility of use in various fields.

It is explanatory drawing of the conventional light intrusion detection system. It is sectional drawing which shows the usage example of the conventional optical parallel converter. It is sectional drawing which shows the structure of this invention light intrusion detection module, and explanatory drawing of the light intrusion detection system using this module. It is sectional drawing which shows the structure of the multi-beam type | mold optical intrusion detection module of this invention. It is explanatory drawing of the optical intrusion detection system using the odd-numbered beam type light intrusion detection module of this invention. It is explanatory drawing of the optical intrusion detection system which uses multiple units | sets of the odd-numbered beam type light intrusion detection modules of this invention. It is explanatory drawing of the optical intrusion detection system using the even-stage beam light intrusion detection module of this invention. It is explanatory drawing of the optical intrusion detection system which uses multiple units | sets of the even-stage beam light intrusion detection module of this invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of a light intrusion detection system using a plurality of multi-beam type light intrusion detection modules of the present invention and a plurality of light emitters / light receivers. It is an Example for verifying operation | movement of the light intrusion detection system using the three light intrusion detection modules of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Light beam 2 Light emitter 3 Light receiver 4 Relay amplifier 5 Metal cord 6 Optical fiber 7 Lens 8 Optical fiber parallel converter A (In the text, it is abbreviated as optical parallel converter A)
9 Optical fiber parallel converter B (abbreviated as optical parallel converter B in the text)
10 Core support 11 Launch support A
12 Startup support B
13 Optical input unit 14 Optical output unit 15 Optical cord (optical fiber)
16 Light Intrusion Detection Module 17 Multi-beam Type Light Intrusion Detection Module 18 Sheath 19 Intruder or Intruder

Claims (12)

  At least one pair of rising supports that form a rising integrally with the main support is provided at a distance, and one optical fiber parallel converter A is provided on one rising support A and the other is provided on the other. One optical fiber parallel converter B is installed on the rising support B of the optical fiber, and the light beam emitting part of the optical fiber parallel converter A and the light receiving part of the optical fiber parallel converter B are arranged so as to transmit and receive the light beam. A single-beam type light intrusion detection module, characterized in that   At least one pair of rising supports that form a rising integrally with the main support is provided at an interval, and one rising support A has k (an integer of 2 or more) light. The fiber parallel converter A has k optical fiber parallel converters B installed on the other rising support B, and corresponds to the light beam output portions of the first to kth optical fiber parallel converters A. A multi-beam type light intrusion detection module characterized in that the light receiving portions of the first to k-th optical fiber parallel converter B are arranged to transmit and receive light beams, respectively.   The light input part and the light emitter of the optical fiber parallel converter A of the light intrusion detection module according to claim 1 are connected by an optical fiber, while the light output part and the light receiver of the optical fiber parallel converter B are connected. In this system, when the light emitter is turned on and an intruder enters the light beam of the light intrusion detection module, the light beam is interrupted and the light detector detects the intrusion detection electricity. A light intrusion detection system characterized in that a signal is output.   The light intrusion detection module according to claim 1 has m (m is an integer of 2 or more) units, and the light output portion and the light input portion of each light intrusion detection module are connected by optical fibers, respectively, A light emitter is connected to the light input portion of the light intrusion detection module, and a light receiver is connected to the light output portion of the terminal light intrusion detection module via an optical fiber. A light intrusion detection system characterized in that when an intruder enters one of the light beams, the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver.   3. The multi-beam type light intrusion module according to claim 2, wherein k is an odd number of 3 or more, and one light input part of the light input parts of the k light parallel converters A of the module is used as a light intrusion detection module. 2 of the (k−1) optical input units excluding the optical input unit are connected by an optical fiber, while the optical input unit from the optical parallel converter A is connected. If one of the (k-1) light output portions excluding the light output portion of the light parallel converter B that receives the light beam is the light output portion of the light intrusion detection module, the light parallel converter A outputs the light parallel light. Starting from the first light beam (A → B) going to the converter B, then the second light beam (B → A) going from the light parallel converter B to the light parallel converter A, and so on, the light parallel conversion Each light beam is converted into an optical parallel converter A until it reaches the kth light beam (A → B) toward the device B. Two of the (k−1) light output units are connected by an optical fiber so as to alternately propagate between the optical parallel converters B, and the light emitter is an optical input of the light intrusion detection module. And the optical receiver are connected to the optical output unit of the light intrusion detection module through optical fibers. In such a system, the light emitter is turned on and an intruder enters the light beam of the multi-beam type light intrusion detection module. In this case, the light intrusion detection system is characterized in that the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver.   The odd-numbered multi-beam type light intrusion detection modules each having an odd number of k of 3 or more according to claim 2 are installed in m units, and each light is transmitted from the first light intrusion detection module to the mth light detection module. The light output portions of the k light parallel converters B of the intrusion detection module and the light input portions of the k light parallel converters A of the next light intrusion detection module are connected by optical fibers, respectively. Of the k light parallel converters A of the light intrusion intelligence module, one light input section and the light emitter are connected by an optical fiber, and the remaining (k-1) light input sections. Two of them are connected by optical fibers, respectively, while the light parallel converter A of the first light intrusion detection module connected to the light emitter by the optical fiber from the m-th light intrusion detection module. The first light beam (A → B) going to the optical parallel converter B A light beam (B → A) from the light row converter B of the mth light intrusion detection module to the light parallel converter A of the first light intrusion detection module, and so on. Each light beam reaches the first light parallel converter A and the mth light parallel converter until reaching the kth light beam (A → B) toward the connected mth light parallel converter B. The light receivers of the m-th (terminal) light intrusion detection module are configured so that the light parallel converters B of the (k−1) light parallel converters B are connected to the light parallel converters B. Two of the light output units are each connected by an optical fiber, and in such a system, when an intruder enters the light beam of the multi-beam type light intrusion detection module by turning on the light emitter, The light beam is blocked and an electrical signal for intrusion detection is output from the receiver. Light intrusion detection system that.   The multi-beam type light intrusion module according to claim 2, wherein k is an odd number of 3 or more, and the module is installed in m (integer of 2 or more) units. One light input part of the light input part is used as a light input part of the light intrusion detection module, and the light output part of the light parallel converter B of the module that receives the light beam emitted from the light input part is excluded (k−). 1) If one of the light output portions is the light output portion of the light intrusion detection module, the light output portion of each light intrusion detection module and the light input portion of the next light intrusion detection module are connected by an optical fiber. The light input part of the first light intrusion detection module is connected to the light emitter, and the light output part of the mth light intrusion detection module is connected to the light receiver by an optical fiber. Excluding the light input part of the first light intrusion detection module k-1) Two of the light input units are connected by an optical fiber, and the light parallel conversion from the light parallel converter A of the light input unit of the first light intrusion detection module is performed. The second light beam (B → A) starting from the first light beam (A → B) going to the device B and then going from the mth light parallel converter B to the first light parallel converter A The light beams are converted into the first light parallel converter A and the mth light parallel conversion until reaching the kth light beam (A → B) toward the mth light parallel converter B. Two of the (k−1) optical output units excluding the mth optical output unit are connected by an optical fiber so as to alternately propagate between the devices B, and in such a system, When an intruder enters the light beam of the multi-beam type light intrusion detection module with the light emitter turned on, the light beam is blocked and the light receiver Light intrusion detection system characterized by electrical signals et intrusion detection is output.   The multi-beam type light intrusion detection module according to claim 2, wherein k is 2, and the optical output portions of the two optical parallel converters B of the module are connected by an optical fiber. A light emitter is connected to the light input section of one of the light parallel converters A, and a light receiver is connected to the light input section of the other light parallel converter A via an optical fiber. In such a system, the light emitter is turned on. Thus, when an intruder enters the light beam of the multi-beam type light intrusion detection module, the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver.   3. The multi-beam type light intrusion module according to claim 2, wherein k is an even number equal to or greater than 4, and one light input portion and light emitter of the light input portions of the k light parallel converters A of the module are light One of the (k−1) light input units excluding the light input unit is connected by a fiber and is connected to the light receiver by an optical fiber, and the remaining (k−2). Each of the two optical input units is connected by an optical fiber, and the first light beam (A →) directed from the optical parallel converter A connected to the one-way light emitter to the optical parallel converter B. B), then the k-th light beam (B → B) going from the parallel converter B to the optical parallel converter A (B → A), and so on. → Until A), each light beam propagates alternately between the light parallel converter A and the light parallel converter B. Two of the light output sections of the k light parallel converters B are connected by an optical fiber. In such a system, the light emitter is turned on to enter the light beam of the multi-beam type light intrusion detection module. A light intrusion detection system characterized in that when a person enters, the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver.   3. The multi-beam type light intrusion detection module having an even number k according to claim 2, wherein there are m (m is an integer of 2 or more) multi-beam type light intrusion detection modules. From the detection module to the mth light detection module, the light output of the k light parallel converters B of each light intrusion detection module and the light of the k light parallel converters A of the next light intrusion detection module The input sections are each connected by an optical fiber, and one light input section of the k light parallel converters A of the light intrusion intelligence module at the start end and the light emitter are connected by an optical fiber. Of the (k-1) light input units excluding the light input unit, one light input unit and the light receiver are connected by an optical fiber, and the remaining (k-2) light beams Two of the input sections are each connected by optical fiber. From the first light beam (A → B) from the optical parallel converter A of the first light intrusion detection module connected to the optical device to the optical parallel converter B of the mth light intrusion detection module Connected to the light receiver such as the light beam (B → A) from the light row converter B of the mth light intrusion detection module to the light parallel converter A of the first light intrusion detection module. Each light beam alternates between the first optical parallel converter A and the m-th optical parallel converter B until reaching the k-th optical beam (B → A) toward the optical parallel converter A. In the system, two of the light output units of the k light parallel converters B of the m-th (terminal) light intrusion detection module are respectively connected by optical fibers. Light beam of multi-beam type light intrusion detection module with light emitter turned on If the intruder has entered the light beam is blocked, the light intrusion detection system characterized by electrical signals of intrusion detection from the light receiver are output.   3. The multi-beam optical detection module according to claim 2, wherein the light input units and light emitters of k (k is an integer) optical parallel converter A are connected by an optical fiber, while k light parallels are connected. The light output unit of the converter B and the light receiver are connected by an optical fiber. In such a system, the light emitter is turned on and an intruder enters the light beam of any of the multi-beam type light intrusion detection modules. In some cases, the light intrusion detection system is characterized in that part or all of the light beam is blocked and an electrical signal for intrusion detection is output from the light receiver.   The multi-beam type light intrusion detection module having an integer of k equal to or greater than 2 according to claim 2 is installed in m (m is an integer greater than or equal to 2) units. Up to the m-th multi-beam type light intrusion detection module, the light output part of each light parallel converter B of each multi-beam type light detection module and each light parallel converter A of the next multi-beam type light detection module. The optical input unit is connected by an optical fiber, and the optical input unit of the optical parallel converter A of the first optical detection module and the light emitter are connected by optical fibers, respectively, so that the mth optical detection is performed. The light output section of the optical parallel converter B of the module and the light receiver are connected by optical fibers, respectively, and the light emitter is turned on in such a system to enter the light beam of any multi-beam type light intrusion detection module. Part of the person The light beam of Beth is blocked, an optical intrusion detection system characterized by electrical signals of intrusion detection from the light receiver are output.

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