阅读说明：本技术 异物侵入光纤传感网及其使用方法 (Foreign matter intrusion optical fiber sensing network and using method thereof ) 是由 任金淼 于 2021-06-15 设计创作，主要内容包括：本发明公开了一种异物侵入光纤传感网及其使用方法,异物侵入光纤传感网包括：沿着周界防护的边界布置有多个异物侵入传感器,沿着周界防护的边界铺设有多段传感光纤和供电线路,所述传感光纤和所述供电线路均与所述多个异物侵入传感器连接,所述传感光纤末端设有报警终端和无线电发射台,站端设有无线电接收站,每段传感光纤均设有段号,每个异物侵入传感器均设有序号。本发明解决了现有安防手段不能适应重要场所周界防护需要的问题。(The invention discloses a foreign matter invasion optical fiber sensing network and a use method thereof, wherein the foreign matter invasion optical fiber sensing network comprises the following components: a plurality of foreign matter invasion sensors are arranged along the boundary of perimeter protection, a plurality of sections of sensing optical fibers and power supply lines are laid along the boundary of the perimeter protection, the sensing optical fibers and the power supply lines are all connected with the foreign matter invasion sensors, the tail ends of the sensing optical fibers are provided with an alarm terminal and a radio transmitting station, a radio receiving station is arranged at the station end, each section of sensing optical fiber is provided with a section number, and each foreign matter invasion sensor is provided with a sequence number. The invention solves the problem that the existing security means can not meet the requirement of perimeter protection of important places.)

1. A foreign object intrusion optical fiber sensor network, comprising: the foreign matter intrusion detection system is characterized in that a plurality of foreign matter intrusion sensors (1) are arranged along the boundary of perimeter protection, a plurality of sections of sensing optical fibers (2) and power supply lines (3) are laid along the boundary of the perimeter protection, the sensing optical fibers (2) and the power supply lines (3) are connected with the foreign matter intrusion sensors (1), an alarm terminal (4) and a radio transmitting station (5) are arranged at the tail end of each sensing optical fiber (2), a radio receiving station (6) is arranged at the station end, each section of sensing optical fiber (2) is provided with a section number, and each foreign matter intrusion sensor (1) is provided with a sequence number;

the foreign matter invasion sensor (1) is used for detecting whether foreign matter invasion exists or not, and if the foreign matter invasion exists, an alarm optical signal (7) is generated and transmitted into the sensing optical fiber (2) and is transmitted to the alarm terminal (4) along the sensing optical fiber (2);

the alarm terminal (4) is used for performing photoelectric conversion and processing on the alarm optical signal (7) uploaded by the sensing optical fiber (2) to obtain an alarm electric signal and transmitting the alarm electric signal to the radio transmitting station (5);

the radio transmitting station (5) is used for encoding the alarm electric signal, generating a radio alarm signal with the segment number of the sensing optical fiber (2) and the serial number of the foreign matter invasion sensor (1), and transmitting the radio alarm signal;

the radio receiving station (6) is used for receiving the radio alarm signal, obtaining the segment number of the sensing optical fiber (2) and the serial number of the foreign matter invasion sensor (1) through decoding, and displaying alarm information.

2. The foreign matter invasion fiber sensor network according to claim 1, wherein the alarm terminal (4) is specifically configured to perform photoelectric conversion, amplification and comparison processing on the alarm optical signal uploaded by the sensing fiber (2) to obtain an alarm electrical signal.

3. The foreign matter invasion fiber optic sensing network according to claim 1, wherein said foreign matter invasion sensor (1) comprises: the device comprises a detection light source (10), a photoelectric detector (13), a signal processing unit (14) and an alarm light source (15), wherein the detection light source and the photoelectric detector (13) are sequentially arranged, and the photoelectric detector (13), the signal processing unit (14) and the alarm light source are sequentially connected;

when a detection light beam (11) emitted by the detection light source (10) cannot irradiate the photoelectric detector (13) due to the fact that an obstacle (12) exists on a channel where the detection light beam is located, the photoelectric detector (13) sends a state signal of an unreceived optical signal to the signal processing unit (14) for photoelectric conversion, amplification and comparison, an alarm light signal (7) is generated by the alarm light source (15) and coupled into the sensing optical fiber (2), and the alarm light signal is transmitted to the alarm terminal (4) along the sensing optical fiber (2).

4. The foreign matter invasion fiber optic sensing network according to claim 3, characterized in that the detection light source (10), the photodetector (13), the signal processing unit (14) and the alarm light source (15) are all connected with the power supply line (3).

5. The foreign matter invasion fiber optic sensing network according to claim 1, wherein said foreign matter invasion sensor (1) comprises: the device comprises two pairs of detection light sources and photodetectors which are arranged in parallel and are separated by a preset distance, and the two pairs of detection light sources and photodetectors comprise a first detection light source (10), a first photodetector (13), a second detection light source (16), a second photodetector (18), a signal processing unit (14) connected with the first photodetector (13) and the second photodetector (18), and an alarm light source (15) connected with the signal processing unit (14);

when a first detection light beam (11) emitted by the first detection light source (10) cannot irradiate the first photoelectric detector (13) due to the fact that an obstacle (12) exists on a path where the first detection light beam is located, the first photoelectric detector (13) sends a first state signal which does not receive an optical signal to the signal processing unit (14);

when a second detection light beam (17) emitted by the second detection light source (16) cannot irradiate the second photoelectric detector (18) due to the existence of the obstacle (12) on the path, the second photoelectric detector (18) sends a second state signal which does not receive the optical signal to the signal processing unit (14);

when the signal processing unit (14) receives the first state signal and the second state signal simultaneously, the size of the obstacle (12) is determined to exceed the preset distance, an alarm light signal (7) is generated through the alarm light source (15) and coupled into the sensing optical fiber (2), and the alarm light signal propagates along the sensing optical fiber (2) to the alarm terminal (4).

6. The foreign matter invasion fiber optic sensing network according to claim 5, characterized in that the first detection light source (10), the first photodetector (13), the second detection light source (16), the second photodetector (18), the signal processing unit (14) and the alarm light source (15) are all connected with the power supply line (3).

7. The foreign matter invasion fiber optic sensing network according to any one of claims 1-6, characterized in that the size of the obstacle in multiple dimensions is determined by arranging multiple pairs of detection light sources and photodetectors in said foreign matter invasion sensor (1).

8. A method for using a foreign matter invasion optical fiber sensing network, which is applied to the foreign matter invasion optical fiber sensing network according to any one of claims 1 to 7, and is characterized in that the method comprises the following steps:

s100, detecting whether foreign matters invade or not by a foreign matter invasion sensor (1), if so, generating an alarm optical signal (7), transmitting the alarm optical signal into a sensing optical fiber (2), and transmitting the alarm optical signal to an alarm terminal (4) along the sensing optical fiber (2);

s200, the alarm terminal (4) performs photoelectric conversion and processing on the alarm optical signal (7) uploaded by the sensing optical fiber (2) to obtain an alarm electric signal, and transmits the alarm electric signal to a radio transmitting station (5);

s300, the radio transmitting station (5) encodes the alarm electric signal, generates a radio alarm signal with the segment number of the sensing optical fiber (2) and the serial number of the foreign matter invasion sensor (1), and transmits the radio alarm signal;

s400, a radio receiving station (6) receives the radio alarm signal, the section number of the sensing optical fiber (2) and the serial number of the foreign matter intrusion sensor (1) are obtained through decoding, and alarm information is displayed.

9. The method of use of claim 8, further comprising:

by arranging a plurality of pairs of detection light sources and photodetectors in the foreign matter intrusion sensor (1), the dimensions of the obstacle in a plurality of dimensions are determined.

Technical Field

The invention relates to the technical field of perimeter protection of important places such as airports, high-speed rail lines, docks, highway bridges and the like, in particular to a foreign matter intrusion optical fiber sensing network and a use method thereof.

Background

With the progress of modern society, the demand for rapid and mass traffic is increasing, and the perimeter precaution of important places such as airports, high-speed rails, wharfs, highway bridges and the like becomes the key point of attention of people.

With the continuous upgrade of perimeter protection, perimeter protection has been developed from pure physical protection (fencing, glass sheets or iron thorns laid on the top of the fence or enclosure) to the current comprehensive protection system combining technical protection, physical protection and civil protection. At present, common perimeter protection comprises an electronic high-voltage fence, video monitoring, infrared detection alarm, a distributed optical fiber vibration sensing network and the like. These techniques are characterized and can be selected by one according to different needs.

However, the existing perimeter protection technology is insufficient for unattended situations such as high-speed railway lines and highway bridges in Chongshan mountains. Most of the perimeter protection technologies are single-point detection, are suitable for short-distance detection, and have difficulty in forming a long-distance sensing network. In the distributed optical fiber vibration sensing network, the optical fiber is used as a sensor and a transmission element, can detect vibration at a long distance, and is tried on a high-speed rail at present, but the detection result depends on a complex calculation process of a signal at the tail end of the optical fiber, the calculation process is influenced by impurities in the optical fiber and factors such as the temperature and the pressure of the optical fiber, especially the vibration caused by environmental noises such as wind noise, rain noise, horn noise and the like cannot be distinguished, so that a high false alarm rate exists, and the distributed optical fiber vibration sensing network is not practically used. In addition, the distributed optical fiber vibration sensing network is only sensitive to optical fiber vibration, and once catastrophe such as debris flow and falling rocks is not changed any more, the sensing network does not give an alarm any more.

The security of the high-speed rail line is taken as an example for explanation, and other important places can refer to the example. High-speed railway lines often need to pass through dangerous places where debris flow and landslide are easy to occur, tunnel passing is common when the high-speed railway lines pass through mountainous areas, and due to rain or geological activities, once severe conditions such as debris flow, landslide or collapse and top rockfall occur in the tunnels, the train safety is seriously influenced. At present, when a train passes through an unmanned area, problems are found mainly by means of visual observation of train operators under many conditions, the train has low running speed and longer reaction time in the past, the running speed of the high-speed rail is high at present, safety protection must be carried out by means of technical means instead of manpower, and particularly, due to the fact that the high-speed rail is long in line and unattended, technical means which are high in reliability and economical and practical are particularly needed for achieving the purpose.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a foreign matter invasion optical fiber sensing network and a using method thereof, and solves the problem that the existing security means cannot meet the requirement of perimeter protection of important places.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a foreign object intrusion optical fiber sensing network comprising: the foreign matter intrusion detection system comprises a plurality of foreign matter intrusion sensors, a plurality of sections of sensing optical fibers and power supply lines are laid along the boundary of perimeter protection, the sensing optical fibers and the power supply lines are connected with the foreign matter intrusion sensors, an alarm terminal and a radio transmitting station are arranged at the tail ends of the sensing optical fibers, a radio receiving station is arranged at the station end, each section of sensing optical fiber is provided with a section number, and each foreign matter intrusion sensor is provided with a serial number;

the foreign matter invasion sensor is used for detecting whether foreign matter invades, and if so, an alarm optical signal is generated and transmitted to the sensing optical fiber and is transmitted to the alarm terminal along the sensing optical fiber;

the alarm terminal is used for performing photoelectric conversion and processing on the alarm optical signal uploaded by the sensing optical fiber to obtain an alarm electrical signal and transmitting the alarm electrical signal to the radio transmitting station;

the radio transmitting station is used for encoding the alarm electric signal, generating a radio alarm signal with the sensing optical fiber section number and the foreign matter invasion sensor serial number and transmitting the radio alarm signal;

and the radio receiving station is used for receiving the radio alarm signal, obtaining the sensing optical fiber section number and the foreign matter invasion sensor serial number by decoding, and displaying alarm information.

Further, the foreign matter invades the optical fiber sensing network, and the alarm terminal is specifically configured to perform photoelectric conversion, amplification and comparison processing on the alarm optical signal uploaded by the sensing optical fiber to obtain an alarm electrical signal.

Further, the foreign object intrusion optical fiber sensor network as described above, the foreign object intrusion sensor includes: the system comprises a detection light source, a photoelectric detector, a signal processing unit and an alarm light source, wherein the detection light source and the photoelectric detector are sequentially arranged, and the photoelectric detector, the signal processing unit and the alarm light source are sequentially connected;

when the detection light beam emitted by the detection light source cannot irradiate the photoelectric detector due to the existence of the obstacle on the path where the detection light source is located, the photoelectric detector sends a state signal without receiving an optical signal to the signal processing unit for photoelectric conversion, amplification and comparison processing, an alarm optical signal is generated by the alarm light source and coupled into the sensing optical fiber, and the alarm optical signal is transmitted to the alarm terminal along the sensing optical fiber.

Further, the foreign matter invades the optical fiber sensing network, and the detection light source, the photoelectric detector, the signal processing unit and the alarm light source are all connected with the power supply circuit.

Further, the foreign object intrusion optical fiber sensor network as described above, the foreign object intrusion sensor includes: the system comprises two pairs of detection light sources and photodetectors which are arranged in parallel and separated by a preset distance, and a light source controller, wherein the two pairs of detection light sources and photodetectors comprise a first detection light source and a first photodetector, a second detection light source and a second photodetector, a signal processing unit connected with the first photodetector and the second photodetector, and an alarm light source connected with the signal processing unit;

when a first detection light beam emitted by the first detection light source cannot irradiate the first photoelectric detector due to the fact that an obstacle exists on a path where the first detection light source is located, the first photoelectric detector sends a first state signal which does not receive an optical signal to the signal processing unit;

when a second detection light beam emitted by the second detection light source cannot irradiate the second photoelectric detector due to the existence of the obstacle on the path where the second detection light source is located, the second photoelectric detector sends a second state signal which does not receive the optical signal to the signal processing unit;

when the signal processing unit receives the first state signal and the second state signal simultaneously, the size of the obstacle is determined to exceed the preset distance, an alarm light signal is generated by the alarm light source and coupled into the sensing optical fiber, and the alarm light signal is transmitted to the alarm terminal along the sensing optical fiber.

Further, the first detection light source, the first photodetector, the second detection light source, the second photodetector, the signal processing unit and the alarm light source are all connected to the power supply line.

Further, the foreign matter invasion optical fiber sensing net as described above determines the size of the obstacle in a plurality of dimensions by arranging a plurality of pairs of detection light sources and photodetectors in the foreign matter invasion sensor.

The invention also provides a use method of the foreign matter invading optical fiber sensing network, which is applied to the foreign matter invading optical fiber sensing network and comprises the following steps:

s100, detecting whether foreign matters invade by a foreign matter invasion sensor, if so, generating an alarm optical signal, transmitting the alarm optical signal into a sensing optical fiber, and transmitting the alarm optical signal to an alarm terminal along the sensing optical fiber;

s200, the alarm terminal performs photoelectric conversion and processing on the alarm optical signal uploaded by the sensing optical fiber to obtain an alarm electrical signal and transmits the alarm electrical signal to a radio transmitting station;

s300, the radio transmitting station encodes the alarm electric signal, generates a radio alarm signal with the sensing optical fiber segment number and the foreign matter invasion sensor serial number, and transmits the radio alarm signal;

s400, the radio receiving station receives the radio alarm signal, obtains the sensing optical fiber segment number and the foreign matter invasion sensor serial number through decoding, and displays alarm information.

Further, the use method as described above, further includes:

by arranging a plurality of pairs of detection light sources and photodetectors in the foreign matter invasion sensor, the dimensions of the obstacle in a plurality of dimensions are determined.

The invention has the beneficial effects that: the foreign matter invasion sensor can be arranged at a proper place according to the requirement, and a proper detection means is selected, so that the sensor has the characteristics of flexibility and diversity; the alarm optical signal generated by the foreign matter invading sensor is coupled into the sensing optical fiber, the optical fiber only needs to receive the optical signal and then transmit the optical signal, the optical fiber does not have the function of the sensor like the optical fiber vibration sensing, and the sensing and the transmission are carried out separately, thereby being beneficial to optimizing the design and avoiding the interference; the sensing optical fiber is adopted to transmit information and the power supply line is adopted to transmit energy, so that the sensing network is simple, reliable and anti-interference; the whole network technology is mature, economical and practical.

Drawings

Fig. 1 is a schematic structural diagram of an optical fiber sensor network for intrusion of foreign objects according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a foreign object intrusion sensor according to an embodiment of the present invention;

fig. 3 is a schematic structural view of another sensor for intrusion of foreign matter according to an embodiment of the present invention;

fig. 4 is a schematic flow chart of a method for using a foreign object intruding into an optical fiber sensor network according to an embodiment of the present invention.

Detailed Description

In order to make the technical problems solved, the technical solutions adopted, and the technical effects achieved by the present invention clearer, the technical solutions of the embodiments of the present invention will be further described in detail with reference to the accompanying drawings.

An embodiment of the present invention provides a foreign object intrusion optical fiber sensor network, as shown in fig. 1, including: a plurality of foreign matter invasion sensors 1 are arranged along the boundary of perimeter protection, a plurality of sections of sensing optical fibers 2 and power supply lines 3 are laid along the boundary of the perimeter protection, the sensing optical fibers 2 and the power supply lines 3 are connected with the foreign matter invasion sensors 1, the tail ends of the sensing optical fibers 2 are provided with alarm terminals 4 and radio transmitting stations 5, the station ends are provided with radio receiving stations 6, each section of sensing optical fiber 2 is provided with a section number, and each foreign matter invasion sensor 1 is provided with a sequence number. The foreign matter invasion sensor 1 is used for detecting whether a foreign matter invades, and if so, an alarm optical signal 7 is generated and transmitted into the sensing optical fiber 2 and is transmitted to the alarm terminal 4 along the sensing optical fiber 2. The alarm terminal 4 is used for performing photoelectric conversion and processing on the alarm optical signal 7 uploaded by the sensing optical fiber 2 to obtain an alarm electrical signal, and transmitting the alarm electrical signal to the radio transmitting station 5, wherein the processing comprises amplification and comparison processing. The radio transmitting station 5 is used for coding the alarm electric signal, generating a radio alarm signal with the number of the sensing optical fiber 2 section and the number of the foreign object invasion sensor 1, and transmitting the radio alarm signal. And the radio receiving station 6 is used for receiving a radio alarm signal, obtaining the segment number of the sensing optical fiber 2 and the serial number of the foreign object intrusion sensor 1 through decoding, and displaying alarm information.

In the embodiment of the invention, the tail end of the sensing optical fiber 2 is connected with an alarm terminal 4, an alarm optical signal 7 transmitted from the sensing optical fiber 2 is subjected to photoelectric conversion in the alarm terminal 4, and an alarm electric signal 8 with the serial number of the foreign matter invasion sensor 1 is obtained through amplification and comparison by an electronic circuit. The radio transmitting station 5 is connected with the alarm terminal 4, and the alarm electric signal 8 is coded in the radio transmitting station 5 to generate a radio alarm signal 9 with the number of the sensing optical fiber 2 section and the number of the foreign object intrusion sensor 1 and then is emitted. The radio receiving station 6 is located in a working room with a person on duty, and after receiving the coded radio alarm signal 9, the radio receiving station 6 knows which optical fiber and which sensor alarm through decoding, and displays alarm information to remind the working personnel to check and process. In fact, the work of radio transmission and reception can also be solved by directly connecting the station-end working room through a wired cable, and the work is not as flexible as a wireless transceiving mode.

By adopting the foreign matter invasion optical fiber sensing network, the foreign matter invasion sensor can be arranged in a proper place according to the requirement, and a proper detection means is selected, so that the foreign matter invasion optical fiber sensing network has the characteristics of flexibility and diversity; the alarm optical signal generated by the foreign matter invading sensor is coupled into the sensing optical fiber, the optical fiber only needs to receive the optical signal and then transmit the optical signal, the optical fiber does not have the function of the sensor like the optical fiber vibration sensing, and the sensing and the transmission are carried out separately, thereby being beneficial to optimizing the design and avoiding the interference; the sensing optical fiber is adopted to transmit information and the power supply line is adopted to transmit energy, so that the sensing network is simple, reliable and anti-interference; the whole network technology is mature, economical and practical. The invention is particularly suitable for perimeter protection of long lines and unattended places.

For example, the entire foreign object intrusion optical fiber sensing network is composed of a plurality of optical fibers connected end to end, each of which is coded with a segment number, and only one of which is shown in fig. 1. The foreign matter intrusion sensor 1 is disposed along the periphery in plural numbers, each of which is numbered. The foreign matter invasion sensor 1 obtains energy by a power supply line 3, and if the invasion of foreign matters is sensed, an alarm optical signal 7 with a sequence number is generated and transmitted to a sensing optical fiber 2 with a special structure. Of course, if the requirement on the accuracy of the alarm position is not high, only a simple alarm optical signal 7 without a serial number can be sent. The alarm terminal 4 at the end of the sensing optical fiber 2 processes the alarm optical signal 7 through photoelectric conversion, amplification, comparison and the like, generates an alarm electrical signal 8 and transmits the alarm electrical signal to the radio transmitting station 5, and the radio transmitting station 5 generates a radio alarm signal 9 with a segment number and a serial number after coding and transmits the radio alarm signal. After receiving the radio alarm signal 9, the radio receiving station 6 in the working room of the person on duty knows which optical fiber and which sensor the alarm is at through decoding, and displays the alarm information to remind the working personnel to check and process.

As an alternative embodiment, the foreign matter intrusion sensor 1 includes: the device comprises a detection light source 10 and a photoelectric detector 13 which are sequentially arranged, and a photoelectric detector 13, a signal processing unit 14 and an alarm light source 15 which are sequentially connected, wherein the detection light source 10, the photoelectric detector 13, the signal processing unit 14 and the alarm light source 15 are all connected with a power supply line 3.

In this implementation manner, when the detection light beam 11 emitted by the detection light source 10 cannot irradiate the photodetector 13 due to the existence of the obstacle 12 on the path, the photodetector 13 sends a status signal of the unreceived light signal to the signal processing unit 14 for photoelectric conversion, amplification and comparison, and then the alarm light source 15 generates the alarm light signal 7, couples the alarm light signal into the sensing optical fiber 2, and transmits the alarm light signal to the alarm terminal 4 along the sensing optical fiber 2. The foreign matter invasion sensor 1 adopts technologies such as infrared correlation, laser correlation or laser radar, and generates an alarm light signal when detecting that foreign matter invades in a certain space.

As shown in fig. 2, at a distance from the sensing fiber 2, a detection light source (laser or light emitting diode) 10 emits a detection light beam 11 to irradiate a photodetector 13. If there is an obstacle 12 on the path of the detection beam 13, the photodetector 13 will not receive the optical signal, and after the status is processed by photoelectric conversion, amplification, comparison, etc. of the signal processing unit 14, the alarm light signal 7 is generated on the alarm light source 15, and the alarm light signal 7 is coupled into the sensing fiber 2 and propagates along the sensing fiber. If there is no obstacle in the path of the probe beam 13, there is no alarm light signal 7. The detection light source 10, the photoelectric detector 13, the signal processing unit 14 and the alarm light source 15 all obtain electric energy from the power supply line 3.

By implementing the alternative embodiment, the light intensity of the alarm light signal 7 can be made different according to the distance between the foreign matter invasion sensor 1 and the end of the sensing optical fiber 2, so as to compensate the light loss in the transmission process.

As another alternative embodiment, the foreign matter invasion sensor 1 includes: the two pairs of detection light sources and photodetectors which are arranged in parallel and are separated by a preset distance comprise a first detection light source 10, a first photodetector 13, a second detection light source 16, a second photodetector 18, a signal processing unit 14 connected with the first photodetector 13 and the second photodetector 18, and an alarm light source 15 connected with the signal processing unit 14. The first detection light source 10, the first photoelectric detector 13, the second detection light source 16, the second photoelectric detector 18, the signal processing unit 14 and the alarm light source 15 are all connected with the power supply line 3.

In this implementation manner, when the first detection light beam 11 emitted by the first detection light source 10 cannot irradiate the first photodetector 13 due to the existence of the obstacle 12 on the path, the first photodetector 13 sends the first state signal that does not receive the optical signal to the signal processing unit 14. When the second detection light beam 17 emitted by the second detection light source 16 cannot irradiate the second photodetector 18 due to the existence of the obstacle 12 on the path, the second photodetector 18 sends a second status signal that does not receive the optical signal to the signal processing unit 14. When the signal processing unit 14 receives the first status signal and the second status signal at the same time, the alarm light signal 7 is generated by the alarm light source 15 and coupled into the sensing fiber 2, and propagates along the sensing fiber 2 to the alarm terminal 4.

In actual operation, the intrusion sensor 1 is prone to false triggering when detecting a single point, and for this reason, it is usually necessary to set a limit that an object has a certain size to alarm. Here, a two-way probe is taken as an example for explanation, as shown in fig. 3. In the first path of detector, at a distance from the sensing fiber 2, a detection light source (laser or light emitting diode) 10 emits a detection light beam 11 to irradiate a photoelectric detector 13. If there is an obstruction 12 in the path of the probe beam 11, no optical signal will be received by the photodetector 13. In the second path of detector which is separated from the first path of detector by a certain distance, a detection light source (laser or light emitting diode) 16 emits a detection light beam 17 at a certain distance away from the sensing optical fiber 2, and the detection light beam irradiates a photoelectric detector 18. If there is an obstruction 12 in the path of the probe beam 17, no optical signal will be received by the photodetector 18. The state of both the photodetector 13 and the photodetector 18 is transmitted to the signal processing unit 14. If neither the photodetector 13 nor the photodetector 18 receives a signal, that is, the size of the obstacle 12 is larger than the interval between the two detectors, the signal processing unit 14 enables the alarm light source 15 to generate the alarm light signal 7, and the alarm light signal 7 is coupled into the sensing optical fiber 2. If there is no obstacle in the path of the probe beam 11 and the probe beam 17 or if the obstacle 12 is so small that it blocks only one of the detectors, the signal processing unit 14 does not cause the warning light source 15 to generate the warning light signal 7. The detection light source 10 and the detection light source 16, the photoelectric detector 13 and the photoelectric detector 18, the signal processing unit 14 and the alarm light source 15 all obtain electric energy from the power supply line 3. The foreign matter intrusion sensor 1 thus warns only of the intrusion of foreign matter having a size greater than a certain limit.

The size problem of only one dimension of the invading foreign body is solved by adopting two paths of detectors. If three-way or four-way detectors are used, at least one of which is arranged at a higher position, the problem of the size of the two dimensions of the horizontal length and the vertical height of the invaded foreign matter can be solved. In actual work, the multi-channel detectors can be flexibly arranged according to needs.

It should be noted that the perimeter protection of the high-speed rail line is taken as an example for description, and the perimeter protection is also applicable to the perimeter protection of important places such as airports, high-speed rail lines, docks, and highway bridges in principle.

The embodiment of the present invention further provides a method for using a foreign object intruding optical fiber sensor network, which is applied to the aforementioned foreign object intruding optical fiber sensor network, and as shown in fig. 4, the method includes:

s100, detecting whether foreign matters invade by a foreign matter invasion sensor, if so, generating an alarm optical signal, transmitting the alarm optical signal into a sensing optical fiber, and transmitting the alarm optical signal to an alarm terminal along the sensing optical fiber;

s200, the alarm terminal performs photoelectric conversion and processing on the alarm optical signal uploaded by the sensing optical fiber to obtain an alarm electrical signal and transmits the alarm electrical signal to the radio transmitting station;

s300, the radio transmitting station encodes the alarm electric signal, generates a radio alarm signal with a sensing optical fiber section number and a foreign matter invasion sensor serial number, and transmits the radio alarm signal;

s400, the radio receiving station receives the radio alarm signal, obtains the sensing optical fiber segment number and the foreign object invasion sensor serial number through decoding, and displays alarm information.

Specifically, the dimensions of the obstacle in multiple dimensions may be determined by arranging a plurality of pairs of detection light sources and photodetectors in the foreign matter invasion sensor.

By adopting the use method of the foreign matter invasion optical fiber sensing network, the foreign matter invasion sensor can be arranged in a proper place according to the requirement, and a proper detection means is selected, so that the foreign matter invasion optical fiber sensing network has the characteristics of flexibility and diversity; the alarm optical signal generated by the foreign matter invading sensor is coupled into the sensing optical fiber, the optical fiber only needs to receive the optical signal and then transmit the optical signal, the optical fiber does not have the function of the sensor like the optical fiber vibration sensing, and the sensing and the transmission are carried out separately, thereby being beneficial to optimizing the design and avoiding the interference; the sensing optical fiber is adopted to transmit information and the power supply line is adopted to transmit energy, so that the sensing network is simple, reliable and anti-interference; the whole network technology is mature, economical and practical. The invention is particularly suitable for perimeter protection of long lines and unattended places.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include such modifications and variations.