CN213092487U - Optical fiber distributed highway side slope rockfall monitoring and early warning system - Google Patents
Optical fiber distributed highway side slope rockfall monitoring and early warning system Download PDFInfo
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- CN213092487U CN213092487U CN202021964809.3U CN202021964809U CN213092487U CN 213092487 U CN213092487 U CN 213092487U CN 202021964809 U CN202021964809 U CN 202021964809U CN 213092487 U CN213092487 U CN 213092487U
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Abstract
The utility model discloses an optic fibre distributing type highway side slope rock falling monitoring and early warning system, draw together light source module, sensing optical fiber, signal conditioning module, high-speed data acquisition card, power module and industry control computer, sensing optical fiber distributes on the side slope rock falling, light source module links to each other with sensing optical fiber one end, be used for providing narrow pulse width laser to sensing optical fiber, signal conditioning module links to each other with sensing optical fiber's the other end, signal conditioning module converts received optical signal to the signal of telecommunication, and filter and enlarge, high-speed data acquisition card connects between signal conditioning system and industry control computer, a signal for will gathering transmits to the industry control computer after carrying out AD conversion. The utility model discloses, be applied to optic fibre distributing type vibration sensing system and survey and the early warning to highway side slope falling rocks, discover falling rocks and position effectively in time, carry out the early warning to the falling rocks calamity.
Description
Technical Field
The utility model relates to a side slope rockfall monitors early warning system, specific theory is an optic fibre distributing type highway side slope rockfall monitors early warning system.
Background
In recent years, the construction of highways in mountain areas and hilly areas in China is rapidly developed, and rockfall disasters caused by slope deformation and damage become the most prominent serious disasters of the highways at present. The common highway design scheme is used, and the highway slope protection adopts labor-intensive protection modes such as mortar-laid rubble slope protection (a facing wall) and an arched water interception framework, so that the highway safety requirements cannot be met. The highway side slope rockfall protection is combined with an internet of things technology and an intelligent method, a technical method capable of carrying out real on-line monitoring and early warning on the side slope rockfall is further developed, and a detection early warning system capable of timely detecting and simultaneously giving out positioning when the rockfall falls is the development trend and urgent need of the highway side slope rockfall protection.
The optical fiber sensor has the advantages of small volume, light weight, high sensitivity, electromagnetic interference resistance, distributed measurement realization and the like, and is widely applied to the fields of industry, civilian use, military use and the like. The optical fiber distributed vibration can detect and position vibration events at any point on the sensing optical fiber, and has wide application prospects in the fields of perimeter security, early warning and monitoring of oil and gas pipelines, monitoring of communication lines, health monitoring of large structures and the like. The optical fiber distributed vibration sensing system is applied to detecting and early warning of the falling rocks on the highway slope, the falling rocks and the positions of the falling rocks can be effectively and timely found, and early warning can be carried out on the falling rocks.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is to provide an optic fibre distributing type highway side slope rockfall monitoring and early warning system is applied to optic fibre distributing type vibration sensing system and surveys and the early warning highway side slope rockfall, discovers rockfall and position effectively in time, carries out the early warning to the rockfall calamity.
Has solved technical problem, the utility model discloses the technical scheme of sampling is: an optical fiber distributed highway slope rockfall monitoring and early warning system comprises a light source module, a sensing optical fiber, a signal conditioning module, a high-speed data acquisition card, a power supply module and an industrial control computer, wherein the sensing optical fiber is distributed on the slope rockfall, the light source module is connected with one end of the sensing optical fiber and used for providing narrow pulse width laser for the sensing optical fiber, the signal conditioning module is connected with the other end of the sensing optical fiber and used for converting received optical signals into electric signals, filtering and amplifying the electric signals, the high-speed data acquisition card is connected between the signal conditioning system and the industrial control computer and used for carrying out AD conversion on the acquired signals and then transmitting the signals to the industrial control computer, and the power supply module supplies power to the light source module, the signal conditioning module.
Further, the light source module comprises a laser light source 1, a laser light source 2, an optical fiber coupling acousto-optic modulator, a wave combiner and a coupler 1, the circulator, coupler 2, the branching filter, photoelectric detector 1 and photoelectric detector 2, laser source 1 is connected to the first input end of multiplexer through fiber coupling acousto-optic modulator, laser source 2 is connected to the second input end of multiplexer, the output of multiplexer is connected to the input of coupler 1, coupler 1 divides into two the tunnel with input optical signal, it is connected to an input of coupler 2 through sensing optic fibre all the way, the other end is connected to the first port of circulator, the second port of circulator is connected to another input of coupler 2, the third port of circulator is connected to the input of branching filter, photoelectric detector 1 is connected to the output of branching filter, photoelectric detector 2 is connected through sensor fiber to the output of coupler 2.
Further, the signal conditioning module includes an operational amplifier U1, an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, an operational amplifier U5, and an operational amplifier U6, an inverting input terminal of the operational amplifier U1 is connected to the photodetector 1, a non-inverting input terminal of the operational amplifier U1 is connected in parallel to a capacitor and a resistor for filtering, an output terminal of the operational amplifier U1 is connected to a non-inverting input terminal of the operational amplifier U2, an output terminal of the operational amplifier U2 is connected to an inverting input terminal of the operational amplifier U5, an inverting input terminal of the operational amplifier U3 is connected to the photodetector 2, a non-inverting input terminal of the operational amplifier U3 is connected in parallel to a capacitor and a resistor for filtering, an output terminal of the operational amplifier U3 is connected to a non-inverting input terminal of the operational amplifier U4, an output terminal of the operational amplifier U4 is connected to a non-inverting input terminal of the operational amplifier U, the output end of the operational amplifier U6 is the output end of the signal conditioning module and is connected to the high-speed information acquisition card.
Furthermore, the power supply module comprises an alternating current power supply, a rectifier bridge and a voltage conversion chip, wherein the alternating current power supply is connected to the input end of the voltage conversion chip through the rectifier bridge, and the output end of the voltage conversion chip outputs the changed voltage.
Furthermore, the high-speed information acquisition card is a PCI-9846 high-speed acquisition card, and the sampling frequency is 40 MHz.
Furthermore, the high-speed data acquisition card transmits signals to the industrial personal computer through the PCI bus.
Further, the laser light source 1 is a 1550nm laser source, and the laser light source 2 is a 1310nm laser source.
Further, a laser light source 1, a laser light source 2, an optical fiber coupling acousto-optic modulator, a wave combiner, a photoelectric detector 1 and a photoelectric detector 2 are packaged in a light source module host, the wave combiner, the coupler 1 and a circulator are packaged in a junction box 1, the coupler 2 is packaged in the junction box 2, the host is connected with the junction box 1 through a guide optical fiber, and the junction box 1 is connected with the junction box 2 through a sensing optical fiber.
The utility model has the advantages that: slope rockfall monitoring and early warning system is based on distributed optical fiber, and optic fibre distributed vibration sensing system possesses high positioning accuracy, good response real-time, can survey simultaneously and fix a position a plurality of rockfall targets, realizes 24 h real-time supervision and early warning to the full day of reality calamity.
Drawings
FIG. 1 is a schematic diagram of the present invention;
FIG. 2 is a schematic diagram of the present invention;
FIG. 3 is a schematic diagram of a light source module;
FIG. 4 is a circuit schematic of a signal conditioning module;
FIG. 5 is a circuit schematic of a power supply module;
in the figure: 1. side slope 2, sensing optical fiber 3 and rockfall.
Detailed Description
The invention will be further described with reference to the accompanying drawings and specific embodiments.
Example 1
The embodiment discloses an optical fiber distributed highway slope rockfall monitoring and early warning system, which is applied as shown in fig. 2, wherein sensing optical fibers 2 are laid on slope edges 1 on two sides of a highway, and one ends of the sensing optical fibers 2 extend to a monitoring center which is far away. When the falling rocks 3 generated by the mountain body are broken and slide on the side slope 1, the transmission optical fibers are vibrated, and the monitoring center can find the falling rocks and the positions in real time to make early warning on the falling rocks.
As shown in fig. 1, the system includes a light source module, a sensing fiber, a signal conditioning module, a high-speed data acquisition card, a power supply module and an industrial control computer, wherein the sensing fiber is distributed on the falling rocks on the side slope, the light source module is connected with one end of the sensing fiber and used for providing narrow-pulse-width laser to the sensing fiber, the signal conditioning module is connected with the other end of the sensing fiber and used for converting received optical signals into electrical signals and filtering and amplifying the electrical signals, the high-speed data acquisition card is connected between the signal conditioning system and the industrial control computer and used for transmitting the acquired signals to the industrial control computer after AD conversion, and the power supply module supplies power to the light source module, the signal conditioning module, the high-speed. In this embodiment, the light source module, the signal conditioning module, the high-speed data acquisition card, the power supply module, and the industrial control computer are installed in a main control cabinet, and the main control cabinet is disposed in a monitoring center.
In various technical solutions of the optical fiber distributed vibration sensing system, the phase-sensitive OTDR has higher positioning accuracy and unique technical advantages of being capable of detecting and positioning a plurality of simultaneous vibration events, and has been increasingly emphasized in recent years. The optical path principle is shown in fig. 3, the light source module includes a laser light source 1, a laser light source 2, an optical fiber coupling acousto-optic modulator (AOM shown in the figure), a multiplexer (WDM 1 shown in the figure), a coupler 1, a circulator, a coupler 2, a wave splitter (WDM 2 shown in the figure), a photodetector 1 and a photodetector 2, the laser light source 1 is connected to a first input end of the wave combiner through the optical fiber coupling acousto-optic modulator, the laser light source 2 is connected to a second input end of the wave combiner, an output end of the wave combiner is connected to an input end of the coupler 1, the coupler 1 divides an input optical signal into two paths, one path is connected to one input end of the coupler 2 through a transmission optical fiber, the other end is connected to a first port of the circulator, a second port of the circulator is connected to another input end of the coupler 2, a third port of the circulator is connected to an input end of the wave splitter, the output end of the wave separator is connected with the photoelectric detector 1, and the output end of the coupler 2 is connected with the photoelectric detector 2 through the sensor optical fiber.
In this embodiment, the laser light source 1 is a 1550nm laser source, and the laser light source 2 is a 1310nm laser source.
In this embodiment, a laser light source 1, a laser light source 2, an optical fiber coupling acousto-optic modulator, a wave combiner, a photoelectric detector 1, and a photoelectric detector 2 are packaged in a light source module host, the wave combiner, the coupler 1, and a circulator are packaged in a junction box 1, the coupler 2 is packaged in a junction box 2, the host is connected with the junction box 1 through a guide optical fiber, and the junction box 1 is connected with the junction box 2 through a sensing optical fiber.
When the optical fiber circulator works, laser emitted by the light source is modulated into pulse light and then is injected into the sensing optical fiber through the circulator. When the pulse light propagates in the sensing optical fiber, back-scattered light is generated at each position in the optical fiber, and the back-scattered light propagates along the direction opposite to the direction of the detection pulse light, and is received by the photoelectric detector after passing through the circulator again. The detector detects a back Rayleigh scattering curve with the abscissa as time and the ordinate as light intensity, and each point in the curve represents the back Rayleigh scattering light intensity at the corresponding position in the sensing optical fiber.
The main difference between phase sensitive OTDR and conventional OTDR is: the high-coherence light source is used for replacing a wide-spectrum light source used in the traditional OTDR, so that the interference effect between back Rayleigh scattering light is enhanced, and the sensitivity to phase change is enhanced. Thus, the back rayleigh scattering curve of a phase sensitive OTDR will exhibit a significant interference pattern. When no vibration event occurs on the sensing optical fiber, the backward Rayleigh scattering curve is kept unchanged; however, when a certain point of the sensing optical fiber is affected by external vibration, due to the strain effect and the elasto-optic effect, the length and the refractive index of the optical fiber at the position are changed, so that the phase of light transmitted at the position is changed, and finally, due to the interference effect, the light intensity of the back rayleigh scattering curve at the corresponding position is changed. Subtracting the back Rayleigh scattering curves before and after the occurrence of the vibration event to obtain a difference curve on which an obvious peak appears, wherein a functional relation exists between the peak position tau and the position l of the occurrence of the vibration event, and detecting and positioning the vibration time according to the functional relation.
In this embodiment, the signal conditioning module converts the received optical signal into an electrical signal, and performs filtering and amplification, and the circuit schematic diagram is as shown in fig. 4, and includes an operational amplifier U1, an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, an operational amplifier U5, and an operational amplifier U6, an inverting input terminal of the operational amplifier U1 is connected to the photodetector 1, a non-inverting input terminal of the operational amplifier U1 is connected in parallel to a capacitor and a resistor for filtering, an output terminal of the operational amplifier U1 is connected to a non-inverting input terminal of the operational amplifier U2, and an output terminal of the operational amplifier U2 is connected to an inverting input terminal of the operational amplifier U. The inverting input end of the operational amplifier U3 is connected with the photoelectric detector 2, the non-inverting input end of the operational amplifier U3 is connected with a capacitor and a resistor which are used for filtering in parallel, the output end of the operational amplifier U3 is connected with the non-inverting input end of the operational amplifier U4, the output end of the operational amplifier U4 is connected with the non-inverting input end of the operational amplifier U5, the output end of the operational amplifier U5 is connected with the non-inverting input end of the operational amplifier U6 through the resistor, and the output end of the operational amplifier U6 is the output end of the signal conditioning module.
As shown in fig. 5, the power supply module includes an ac power supply, a rectifier bridge, and a voltage conversion chip, the ac power supply is connected to the input end of the voltage conversion chip through the rectifier bridge, the output end of the voltage conversion chip outputs the changed voltage, the power supply module supplies power to other modules, and the working stability of the power supply module is a precondition for the normal operation of the whole system.
In the implementation, the high-speed information acquisition card is a Linghua PCI-9846 high-speed acquisition card, the sampling frequency is 40 MHz, the requirement of the positioning precision of the system is met, the onboard 512M memory provides good data storage depth for the system, and the real-time requirement of the system is met. The high-speed data acquisition card transmits signals to the industrial control computer through the PCI bus.
Slope rockfall monitoring and early warning system is based on distributed optical fiber, and optic fibre distributed vibration sensing system possesses high positioning accuracy, good response real-time, can survey simultaneously and fix a position a plurality of rockfall targets, realizes 24 h real-time supervision and early warning to the full day of reality calamity.
The foregoing description is only for the basic principles and preferred embodiments of the present invention, and modifications and substitutions made by those skilled in the art according to the present invention belong to the protection scope of the present invention.
Claims (8)
1. The utility model provides an optic fibre distributing type highway side slope rockfall monitoring and early warning system which characterized in that: the sensor comprises a light source module, a sensing optical fiber, a signal conditioning module, a high-speed data acquisition card, a power supply module and an industrial control computer, wherein the sensing optical fiber is distributed on a side slope rockfall, the light source module is connected with one end of the sensing optical fiber and used for providing narrow-pulse-width laser for the sensing optical fiber, the signal conditioning module is connected with the other end of the sensing optical fiber and used for converting received optical signals into electric signals, filtering and amplifying the electric signals, the high-speed data acquisition card is connected between the signal conditioning system and the industrial control computer and used for transmitting the acquired signals to the industrial control computer after AD conversion, and the power supply module supplies power to the light source module, the signal conditioning module, the.
2. The optical fiber distributed highway slope rockfall monitoring and early warning system according to claim 1, characterized in that: the light source module comprises a laser light source 1, a laser light source 2, an optical fiber coupling acousto-optic modulator AOM, a wave combiner WDM1, a coupler 1, a circulator, a coupler 2, a wave splitter WDM2, a photoelectric detector 1 and a photoelectric detector 2, the laser light source 1 is connected to a first input end of a combiner WDM1 through an optical fiber coupling acousto-optic modulator AOM, the laser light source 2 is connected to a second input end of a combiner WDM1, an output end of the combiner WDM1 is connected to an input end of a coupler 1, the coupler 1 divides an input optical signal into two paths, one path is connected to one input end of the coupler 2 through a sensing optical fiber, the other end of the path is connected to a first port of a circulator, a second port of the circulator is connected to the other input end of the coupler 2, a third port of the circulator is connected to an input end of a wave splitter 2, an output end of the wave splitter WDM2 is connected with a photoelectric detector 1, and an output end of the coupler 2 is connected with the photoelectric detector 2 through a sensor.
3. The optical fiber distributed highway slope rockfall monitoring and early warning system according to claim 2, characterized in that: the signal conditioning module comprises an operational amplifier U1, an operational amplifier U2, an operational amplifier U3, an operational amplifier U4, an operational amplifier U5 and an operational amplifier U6, wherein the inverting input end of the operational amplifier U1 is connected with the photoelectric detector 1, the non-inverting input end of the operational amplifier U1 is connected with a capacitor C1 and a resistor R1 which are used for filtering in parallel, the output end of the operational amplifier U1 is connected with the non-inverting input end of the operational amplifier U2, the output end of the operational amplifier U2 is connected with the inverting input end of the operational amplifier U5, the inverting input end of the operational amplifier U3 is connected with the photoelectric detector 2, the non-inverting input end of the operational amplifier U3 is connected with a capacitor C2 and a resistor R2 which are used for filtering in parallel, the output end of the operational amplifier U3 is connected with the non-inverting input end of the operational amplifier U4, the output end of the operational amplifier U, The R10 is connected to the positive input end of the operational amplifier U6, and the output end of the operational amplifier U6 is the output end of the signal conditioning module and is connected to the high-speed information acquisition card.
4. The optical fiber distributed highway slope rockfall monitoring and early warning system according to claim 1, characterized in that: the power supply module comprises an alternating current power supply, a rectifier bridge and a voltage conversion chip, wherein the alternating current power supply is connected to the input end of the voltage conversion chip through the rectifier bridge, and the output end of the voltage conversion chip outputs the changed voltage.
5. The optical fiber distributed highway slope rockfall monitoring and early warning system according to claim 1, characterized in that: the high-speed information acquisition card is a PCI-9846 high-speed acquisition card, and the sampling frequency is 40 MHz.
6. The optical fiber distributed highway slope rockfall monitoring and early warning system according to claim 1, characterized in that: the high-speed data acquisition card transmits signals to the industrial control computer through the PCI bus.
7. The optical fiber distributed highway slope rockfall monitoring and early warning system according to claim 2, characterized in that: the laser light source 1 is a 1550nm laser source, and the laser light source 2 is a 1310nm laser source.
8. The optical fiber distributed highway slope rockfall monitoring and early warning system according to claim 2, characterized in that: the laser light source 1, the laser light source 2, the optical fiber coupling acousto-optic modulator AOM, the wave combiner WDM1, the photoelectric detector 1 and the photoelectric detector 2 are packaged in a light source module host, the wave splitter WDM2, the coupler 1 and the circulator are packaged in a junction box 1, the coupler 2 is packaged in the junction box 2, the host is connected with the junction box 1 through a guide optical fiber, and the junction box 1 is connected with the junction box 2 through a sensing optical fiber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021964809.3U CN213092487U (en) | 2020-09-10 | 2020-09-10 | Optical fiber distributed highway side slope rockfall monitoring and early warning system |
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| CN202021964809.3U CN213092487U (en) | 2020-09-10 | 2020-09-10 | Optical fiber distributed highway side slope rockfall monitoring and early warning system |
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| CN213092487U true CN213092487U (en) | 2021-04-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114220284A (en) * | 2021-12-13 | 2022-03-22 | 四川路桥建设集团交通工程有限公司 | Expressway monitoring method, system, computer equipment and computer readable storage medium |
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2020
- 2020-09-10 CN CN202021964809.3U patent/CN213092487U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114220284A (en) * | 2021-12-13 | 2022-03-22 | 四川路桥建设集团交通工程有限公司 | Expressway monitoring method, system, computer equipment and computer readable storage medium |
| CN114220284B (en) * | 2021-12-13 | 2023-08-08 | 四川路桥建设集团交通工程有限公司 | Highway monitoring method, system, computer equipment and computer readable storage medium |
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