CN106643491A - Bridge micro-displacement sensing system based on double-core fiber - Google Patents
Bridge micro-displacement sensing system based on double-core fiber Download PDFInfo
- Publication number
- CN106643491A CN106643491A CN201611005575.8A CN201611005575A CN106643491A CN 106643491 A CN106643491 A CN 106643491A CN 201611005575 A CN201611005575 A CN 201611005575A CN 106643491 A CN106643491 A CN 106643491A
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- module
- core fiber
- bridge
- signal processing
- processing module
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
- G01B11/161—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
Abstract
A bridge micro-displacement sensing system based on a double-core fiber is suitable for fields of bridge health monitoring and fiber sensing. The system is composed of a measurement module and a reception module, the output end of a laser source (1) of the measurement module is connected to the input end of a phase modulator (2), the output end of the phase modulator (2) is connected with the input end of the double-core fiber (3), structural displacement signals are applied to the double-core fiber, the output end of the double-core fiber (3) is connected with the input end of a photoelectric detector (4), the output end of the photoelectric detector (4) is connected to the input end of a signal processing module (5), the output end of the signal processing module (5) is connected with the input end of a wireless emission module (6), the output end of a wireless reception module (7) is connected with the input end of a signal processing module (8), and the output end of the signal processing module (8) is connected to a display module (9) and a loudspeaker (10). The system uses the double-core fiber sensing technology, can detect displacement of a bridge structure accurately, and also has the advantages including low power consumption, electromagnetic interference resistance and environmental corrosion resistance; and the health of the bridge structure can be monitored remotely in real time, and hidden safety hazards caused by untimely health monitoring of the bridge structure can be avoided.
Description
Technical field
The present invention relates to the bridge micro-displacement sensing system of twin-core fiber, it is adaptable to the field such as bridge machinery, Fibre Optical Sensor.
Technical background
As modern society strengthens the demand of convenient traffic, transport development cause flourishes, some complex structures, across
The larger bridge of degree builds up and comes into operation in succession, during the operation of bridge, because to the detection of bridge structure not in time,
The small damage of bridge structure and dislocation displacement may produce huge potential safety hazard, also once occur all over the world in a large number because of inspection
The bridge damage event for not detecting position and occurring, massive losses are caused to economy and lives and properties, therefore people transport to bridge
The assessment of security, durability under row state is re-recognized, for the structure of the real-time safety detecting system of bridge structure
Also profound significance is had more.
At present, the detection method for bridge depends on Dynamic And Static Loads test and the site operation of testing staff is supervised
Survey, the means of its detection substantially have potential differentiation, ultrasonic pulse, GPR, infrared thermal imagery, dialysis imaging etc., but these are examined
Survey method not only needs substantial amounts of manpower and materials, and its detection sensitivity is low, poor anti jamming capability, some traditional detections knots
Structure with the elongated meeting of use time is aging must be than more serious, the factor such as abrasion and raindrop erosion can make Detection results be deteriorated.Example
Such as conventional foil gauge Electric Measurement Technology, the resistance-strain sector-meeting in its sensing arrangement is by environment temperature and humidity and wire
The impact of length, its accuracy is difficult to ensure, as the complexity of bridge structure becomes accuracy, reality big and to bridge machinery
When property will become strong, and this sensor-based system can no longer meet the requirement to bridge machinery.Accordingly, it would be desirable to a kind of new sensor-based system,
Can in real time be detected in particular circumstances for bridge, be realized inspection maintenance and the safety precaution function of bridge.
The content of the invention
The technical problem to be solved is to provide a kind of bridge micro-displacement sensing system of twin-core fiber.
Technical scheme：
A kind of bridge micro-displacement sensing system of twin-core fiber, the system is by measurement module and receiver module two parts group
Into.Measurement module is divided into the structure phase of out-hole run module and descending measurement module, out-hole run module and descending measurement module
Together.The laser source output terminal of measurement module connects the input of phase-modulator, the output termination twin-core fiber of phase-modulator
Input, microbit shifting signal is applied on twin-core fiber, the input of the output termination photodetector of twin-core fiber, light electrical resistivity survey
Survey the input of the output termination signal processing module of device, the input of the output termination wireless transmitter module of signal processing module
End.The input of the wireless receiving module output termination signal processing module of receiver module, the output termination of signal processing module
Display module and loudspeaker module.
First out-hole run module and descending measurement module are arranged in into the up direction of bridge to be detected and descending
Direction two ends, the micrometric displacement situation of real-time detection bridge structure.Incide after the phase modulated device modulation of light that light source sends double
On core fibre, when bridge structure does not occur relative micrometric displacement, interference of light wavelength will not occur wave length shift phenomenon in optical fiber.
When there is relative micrometric displacement in bridge structure, photodetector will detect the interference wave length of light and change.In real time
Optical signal becomes electric signal after photodetector, and electric signal sends into wireless transmitter module through signal processing module process,
Wireless transmitter module launches wireless signal.Wireless receiving module receives wireless signal, and by this signal output to signal transacting
Module, the signal of signal processing module output is shown by display module, in real time to the microbit of related personnel's display bridge structure
Shift one's love condition, and transmit a signal to loudspeaker module under special circumstances, loudspeaker module sends alarm signal, so as to notify correlation
Personnel.Receiver module is placed on the detection unit of bridge.In detecting system, multiple receiver modules can be configured.
Beneficial effects of the present invention：The bridge micro-displacement sensing system of twin-core fiber accurately can in time detect bridge structure
In micrometric displacement situation, based on the cognition technology of twin-core fiber, with lightweight, small volume, low in energy consumption, sensitivity is high, anti-corruption
The advantages of erosion, electromagnetism interference, high degree of automation, and system realizes bridge by the way of high-frequency wireless signals transmission data
The detection of girder construction and safe early warning, whole prealarming process is swift in response.The bridge of manual detection execution conditions difference can be prevented effectively from
Beam, because of the accident that bridge structure health detection occurs not in time.
Description of the drawings
Bridge micro-displacement sensing system structural representations of the Fig. 1 based on twin-core fiber.
Specific embodiment
Below in conjunction with the accompanying drawings the invention will be further described.
Embodiment one, is shown in Fig. 1, a kind of bridge micro-displacement sensing system of twin-core fiber, and the system is by measurement module and connects
Module two parts composition is received, the output of the lasing light emitter 1 of measurement module terminates the input of phase-modulator 2, phase-modulator 2
The input of output termination twin-core fiber 3, displacement signal is applied on twin-core fiber, the output termination photodetection of twin-core fiber 3
The input of device 4, the input of the output termination signal processing module 5 of photodetector 4, the output termination of signal processing module 5
The input of wireless transmitter module 6.The input of the output termination signal processing module 8 of the wireless receiving module 7 of receiver module,
The output termination display module 9 of signal processing module 8 and loudspeaker 10.
First out-hole run module and descending measurement module are arranged in into the up direction of bridge to be detected and descending
Direction two ends, the micrometric displacement situation of real-time detection bridge structure.Incide after the phase modulated device modulation of light that light source sends double
On core fibre, when bridge structure does not occur relative micrometric displacement, interference of light wavelength will not occur wave length shift phenomenon in optical fiber.
When there is relative micrometric displacement in bridge structure, photodetector will detect the interference wave length of light and change.In real time
Optical signal becomes electric signal after photodetector, and electric signal sends into wireless transmitter module through signal processing module process,
Wireless transmitter module launches wireless signal.Wireless receiving module receives wireless signal, and by this signal output to signal transacting
Module, the signal of signal processing module output is shown by display module, in real time to the microbit of related personnel's display bridge structure
Shift one's love condition, and transmit a signal to loudspeaker module under special circumstances, loudspeaker module sends alarm signal, so as to notify correlation
Personnel.
Light source described in the present embodiment is LED/light source, and twin-core fiber length is 4cm, and twin-core fiber cladding diameter is 125 μ
M, two core diameters are 9 μm, and the modulating frequency of phase-modulator is 100Hz.It is wirelessly transferred using 2.4G networks.
Embodiment two, is shown in Fig. 1, a kind of bridge micro-displacement sensing system of twin-core fiber, and the system is by measurement module and connects
Module two parts composition is received, the output of the lasing light emitter 1 of measurement module terminates the input of phase-modulator 2, phase-modulator 2
The input of output termination twin-core fiber 3, displacement signal is applied to twin-core fiber, the output termination photodetector 4 of twin-core fiber 3
Input, the input of the output termination signal processing module 5 of photodetector 4, the output termination of signal processing module 5 is wireless
The input of transmitter module 6.The input of the output termination signal processing module 8 of the wireless receiving module 7 of receiver module, signal
The output termination display module 9 of processing module 8 and loudspeaker 10.
First out-hole run module and descending measurement module are arranged in into the up direction of bridge to be detected and descending
Direction two ends, the micrometric displacement situation of real-time detection bridge structure.Incide after the phase modulated device modulation of light that light source sends double
On core fibre, when bridge structure does not occur relative micrometric displacement, interference of light wavelength will not occur wave length shift phenomenon in optical fiber.
When there is relative micrometric displacement in bridge structure, photodetector will detect the interference wave length of light and change.In real time
Optical signal becomes electric signal after photodetector, and electric signal sends into wireless transmitter module through signal processing module process,
Wireless transmitter module launches wireless signal.Wireless receiving module receives wireless signal, and by this signal output to signal transacting
Module, the signal of signal processing module output is shown by display module, in real time to the microbit of related personnel's display bridge structure
Shift one's love condition, and transmit a signal to loudspeaker module under special circumstances, loudspeaker module sends alarm signal, so as to notify correlation
Personnel.
Light source described in the present embodiment is wideband light source, and twin-core fiber length is 8cm, and photonic crystal cladding diameter is 125 μ
M, core diameter is 9 μm, and the modulating frequency of phase-modulator is 2000Hz.It is wirelessly transferred and adopts Zigbee network.
Embodiment three, is shown in Fig. 1, a kind of bridge micro-displacement sensing system of twin-core fiber, and the system is by measurement module and connects
Module two parts composition is received, the output of the lasing light emitter 1 of measurement module terminates the input of phase-modulator 2, phase-modulator 2
The input of output termination twin-core fiber 3, displacement signal is applied to twin-core fiber, the output termination photodetector 4 of twin-core fiber 3
Input, the input of the output termination signal processing module 5 of photodetector 4, the output termination of signal processing module 5 is wireless
The input of transmitter module 6.The input of the output termination signal processing module 8 of the wireless receiving module 7 of receiver module, signal
The output termination display module 9 of processing module 8 and loudspeaker 10.
First out-hole run module and descending measurement module are arranged in into the up direction of bridge to be detected and descending
Direction two ends, the micrometric displacement situation of real-time detection bridge structure.Incide after the phase modulated device modulation of light that light source sends double
On core fibre, when bridge structure does not occur relative micrometric displacement, interference of light wavelength will not occur wave length shift phenomenon in optical fiber.
When there is relative micrometric displacement in bridge structure, photodetector will detect the interference wave length of light and change.In real time
Optical signal becomes electric signal after photodetector, and electric signal sends into wireless transmitter module through signal processing module process,
Wireless transmitter module launches wireless signal.Wireless receiving module receives wireless signal, and by this signal output to signal transacting
Module, the signal of signal processing module output is shown by display module, in real time to the microbit of related personnel's display bridge structure
Shift one's love condition, and transmit a signal to loudspeaker module under special circumstances, loudspeaker module sends alarm signal, so as to notify correlation
Personnel.
Light source described in the present embodiment is LD light sources, and twin-core fiber length is 5cm, and twin-core fiber cladding diameter is 125 μm,
Core diameter is 9 μm, and the modulating frequency of phase-modulator is 1000Hz.It is wirelessly transferred using 900Mhz networks
The light source of the present invention can use the multi wave length illuminating source of C, L, O, E wave band, and twin-core fiber length can be according to reality
Applicable situation is chosen, and the device for being used is commercial devices.The above be only to present pre-ferred embodiments specifically
It is bright, and protection scope of the present invention is not limited to the above, those skilled in the art can be right according to the bright thought of we
The present invention carries out various modifications and modification, and these should belong to protection scope of the present invention.
Claims (1)
1. a kind of bridge micro-displacement sensing system based on twin-core fiber, the system is characterized in that：System by measurement module and
Receiver module two parts are constituted, and the input of output termination phase-modulator (2) of the lasing light emitter (1) of measurement module, phase place is adjusted
The input of output termination twin-core fiber (3) of device (2) processed, microbit shifting signal is applied on twin-core fiber, and twin-core fiber (3) is defeated
Go out to terminate photodetector (4) input, the input of output termination signal processing module (5) of photodetector (4), signal
The input of output termination wireless transmitter module (6) of processing module (5), the output of the wireless receiving module (7) of receiver module
The input of termination signal processing module (8), output termination display module (9) of signal processing module (8) and loudspeaker (10).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611005575.8A CN106643491A (en) | 2016-11-15 | 2016-11-15 | Bridge micro-displacement sensing system based on double-core fiber |
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|---|---|---|---|
| CN201611005575.8A CN106643491A (en) | 2016-11-15 | 2016-11-15 | Bridge micro-displacement sensing system based on double-core fiber |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201964883U (en) * | 2010-10-12 | 2011-09-07 | 中国神华能源股份有限公司 | System for monitoring state of railroad bridge |
| CN102607425A (en) * | 2012-03-19 | 2012-07-25 | 武汉理工大学 | Steel rail or bridge displacement monitoring device for fiber Bragg grating transformation ring |
| CN202886666U (en) * | 2012-07-11 | 2013-04-17 | 中国船舶重工集团公司第七一五研究所 | Special optical cable used for monitoring steel rail deformation |
| CN103278098A (en) * | 2013-06-06 | 2013-09-04 | 合肥工业大学 | Ultra-precision micro-displacement sensing system and processing method based on double-FBG suspended type probe structure |
| CN104960550A (en) * | 2015-06-25 | 2015-10-07 | 北京交通大学 | Unmanned watching system for railway on-site operation protection based on double-core optical fiber interferometer |
-
2016
- 2016-11-15 CN CN201611005575.8A patent/CN106643491A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201964883U (en) * | 2010-10-12 | 2011-09-07 | 中国神华能源股份有限公司 | System for monitoring state of railroad bridge |
| CN102607425A (en) * | 2012-03-19 | 2012-07-25 | 武汉理工大学 | Steel rail or bridge displacement monitoring device for fiber Bragg grating transformation ring |
| CN202886666U (en) * | 2012-07-11 | 2013-04-17 | 中国船舶重工集团公司第七一五研究所 | Special optical cable used for monitoring steel rail deformation |
| CN103278098A (en) * | 2013-06-06 | 2013-09-04 | 合肥工业大学 | Ultra-precision micro-displacement sensing system and processing method based on double-FBG suspended type probe structure |
| CN104960550A (en) * | 2015-06-25 | 2015-10-07 | 北京交通大学 | Unmanned watching system for railway on-site operation protection based on double-core optical fiber interferometer |
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Application publication date: 20170510 |