CN107044862B - Hybrid fiber optic sensing system - Google Patents
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- CN107044862B CN107044862B CN201710042561.1A CN201710042561A CN107044862B CN 107044862 B CN107044862 B CN 107044862B CN 201710042561 A CN201710042561 A CN 201710042561A CN 107044862 B CN107044862 B CN 107044862B
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- 239000000835 fiber Substances 0.000 title claims description 69
- 239000013307 optical fiber Substances 0.000 claims abstract description 153
- 230000003287 optical effect Effects 0.000 claims abstract description 48
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000005086 pumping Methods 0.000 claims abstract description 22
- 230000010287 polarization Effects 0.000 claims description 27
- 230000003068 static effect Effects 0.000 abstract description 3
- 238000000605 extraction Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 14
- 238000012544 monitoring process Methods 0.000 description 10
- 238000000034 method Methods 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 230000005540 biological transmission Effects 0.000 description 4
- 230000009977 dual effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000004927 fusion Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000012806 monitoring device Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35354—Sensor working in reflection
- G01D5/35358—Sensor working in reflection using backscattering to detect the measured quantity
- G01D5/35364—Sensor working in reflection using backscattering to detect the measured quantity using inelastic backscattering to detect the measured quantity, e.g. using Brillouin or Raman backscattering
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Abstract
The invention discloses a hybrid optical fiber sensing system, and relates to the technical field of optical fiber sensing. The sensing system comprises a laser, an optical fiber coupler, a continuous detection optical path, a pumping pulse optical path, a sensing optical fiber, a second optical fiber circulator and a control system. The output end of the laser is divided into two paths after passing through the optical fiber coupler, the first path is connected with the input end of the continuous detection optical path, the second path is connected with the input end of the pumping pulse optical path, the output end of the continuous detection optical path is connected with one input end of the second optical fiber circulator through the sensing optical fiber, the output end of the pumping pulse optical path is connected with the other input end of the second optical fiber circulator, and the output end of the second optical fiber circulator is connected with the input end of the control system. The system has low cost, and can realize the static and dynamic simultaneous extraction of the whole and partial key strain/temperature information of the structure with larger range and higher space precision.
Description
Technical Field
The invention relates to the technical field of optical fiber sensing, in particular to a hybrid optical fiber sensing system for synchronously testing stimulated Brillouin scattering by utilizing reflection/transmission of an optical fiber grating.
Background
The structural health monitoring can provide reliable data for performance evaluation, damage diagnosis and life prediction during the service period of the structure, and can also provide important parameters for design, protection and theoretical research of the structure. Based on the technical advantages of optical fiber sensing, the optical fiber Bragg grating sensing technology and the optical fiber Brillouin scattering-based sensing technology have played an important role in the field of structural health monitoring at present. In particular, in recent years, the stimulated brillouin scattering-based sensing technology (BOTDA) has greatly improved sensing range and spatial precision, and has obvious advantages compared with the sensing technology based on optical fiber self-Brillouin scattering. Fiber grating sensing technology has the unique advantages of high accuracy, multiplexing, and dynamic measurement, but can only provide discrete spatial information. In contrast, sensing techniques based on brillouin scattering of optical fibers can provide continuous information along the optical fiber over hundreds of kilometers, but with less accuracy. How to combine the two, the advantages of double technologies are fully brought into play, the overall information grasp and the local key information monitoring of the structure are synchronously realized, and the method has important significance for structural health monitoring.
Currently, researchers have conducted active research on this problem, and some research results are achieved. For example, the patent 'full-scale distributed and local high-precision collinear optical fiber sensing method' (application number: ZL 200810064168.3) proposes to integrate BOTDA (R) and FBG demodulators by adopting an optical switch or coupler to form a new monitoring system. The patent 'bottom plate stress monitoring device and method based on Brillouin optical time domain reflection type optical fiber sensing and optical fiber grating sensing' (application number: ZL201220426263. X) and 'FBG-BOTDA combined sensor detection method of pipe pile driving into soil layer' (publication 201310397789.4) adopt similar schemes. The application of two fiber optic sensing technologies simultaneously to power transmission lines, tunnels, FRP and concrete beam prestress loss monitoring is also reported in literature (Journal of Lightwave Technology, 2013, 31:1559-1565;Structural Health Monitoring, 2010, 9:341-346;International Journal of Distributed Sensor Networks, 2012;Structural Control and Health Monitoring, 2014, 21:317-330), respectively. The scheme and the application are that the BOTDA (R) and FBG demodulator dual systems are adopted, so that single-fiber sharing is realized. Wherein the optical switching scheme cannot achieve simultaneous testing of both. In the scheme of the coupler, BOTDR and FBG demodulators can be tested simultaneously by simply designing, and mutual interference between optical signals cannot be generated; however, in the simultaneous testing process of the BOTDA and the FBG, as the BOTDA is a double-end testing system, the detection light of the BOTDA enters the FBG demodulator, so that the signal-to-noise ratio of the demodulation system is reduced, and the peak searching is inaccurate or even impossible. By adopting the double systems, the monitoring cost is increased, and the technology fusion in the true sense is not realized. The patent 'distributed optical fiber sensor for monitoring the whole and partial strain of the engineering structure' (application number: 201110069430.5) adopts a single-system single-fiber technical scheme, so that the system is compatible with the optical fiber grating and the Brillouin time domain reflection technology, and the system cost is reduced. The scheme can be used as the fusion of the BOTDR technology and the FBG sensing technology based on single-ended measurement, and compared with the sensing technology based on stimulated Brillouin scattering of the optical fiber, the sensing distance and the space testing precision of the FBG sensing technology are greatly limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing a hybrid optical fiber sensing system capable of simultaneously acquiring the whole structural information with larger range and higher space precision and the static and dynamic information of a local key position.
In order to solve the technical problems, the invention adopts the following technical scheme: a hybrid fiber optic sensing system, characterized by: the laser comprises a laser, an optical fiber coupler, a continuous detection optical path, a pumping pulse optical path, a sensing optical fiber, a second optical fiber circulator and a control system, wherein the output end of the laser is divided into two paths after passing through the optical fiber coupler, the first path is connected with the input end of the continuous detection optical path, the second path is connected with the input end of the pumping pulse optical path, the output end of the continuous detection optical path is connected with one input end of the second optical fiber circulator through the sensing optical fiber, the output end of the pumping pulse optical path is connected with the other input end of the second optical fiber circulator, and the output end of the second optical fiber circulator is connected with the input end of the control system.
The further technical proposal is that: the continuous detection light path comprises a second optical fiber polarization controller, a second photoelectric modulator, a first optical fiber circulator, an optical fiber grating, a second optical fiber amplifier and a polarization scrambler. An output end of the optical fiber coupler is connected with an input end of the second optical fiber polarization controller, an output end of the second optical fiber polarization controller is connected with an input end of the second photoelectric modulator, an output end of the second photoelectric modulator is connected with an input end of the first optical fiber circulator, the fiber bragg grating is connected with the other input end of the first fiber circulator, the output end of the first fiber circulator is connected with the input end of the second fiber amplifier, the output end of the second fiber amplifier is connected with the input end of the polarization scrambler, and the output end of the polarization scrambler is connected with one end of the sensing fiber.
The further technical proposal is that: the pump pulse optical path comprises a first optical fiber polarization controller, a first electro-optical modulator, a third optical fiber polarization controller, a third electro-optical modulator, a pulse generator and a first optical fiber amplifier, wherein one output end of the optical fiber coupler is connected with one input end of the first optical fiber polarization controller, one output end of the first optical fiber polarization controller is connected with one input end of the first electro-optical modulator, one output end of the first electro-optical modulator is connected with one input end of the third optical fiber polarizer, one output end of the third optical fiber polarizer is connected with one input end of the third electro-optical modulator, one output end of the pulse generator is connected with the other input end of the third electro-optical modulator, one output end of the third electro-optical modulator is connected with one input end of the first optical fiber amplifier, and one output end of the first optical fiber amplifier is connected with one input end of the second optical fiber circulator.
The further technical proposal is that: the control system comprises a third optical fiber circulator, an optical fiber F-P filter, a sawtooth wave generator, a first photoelectric detector, a band-pass filter, a second photoelectric detector and a signal acquisition and controller, wherein the output end of the second optical fiber circulator is connected with the input end of the third optical fiber circulator, one output end of the third optical fiber circulator is connected with one input end of the optical fiber F-P filter, the output end of the sawtooth wave generator is connected with the other input end of the optical fiber F-P filter, the output end of the optical fiber F-P filter is connected with one input end of the signal acquisition and controller through the first photoelectric detector, the other output end of the third optical fiber circulator is connected with the input end of the band-pass filter, the output end of the band-pass filter is connected with the other input end of the signal acquisition and controller through the second photoelectric detector, and one control output end of the signal acquisition and controller is connected with sawtooth waves of the sawtooth wave generator.
The further technical proposal is that: and the sensing optical fiber is provided with an optical fiber grating array.
The further technical proposal is that: the fiber grating array comprises more than two fiber gratings.
The beneficial effects of adopting above-mentioned technical scheme to produce lie in: the continuous detection light path, the pumping pulse light path and the sensing optical fiber form a stimulated Brillouin scattering light path based on double-end measurement; meanwhile, the pumping pulse light path is pulse broadband light and can be used as a main light source of the fiber bragg grating array, and when the optical power of the pumping pulse light path in certain wave bands is lower than that of the continuous detection light path, the continuous detection light provides a light source for the fiber bragg grating array; the dual light sources increase the system stability and expand the use bandwidth of the fiber bragg gratings in the sensing optical fibers, thereby improving the multiplexing quantity.
The optical fiber grating array is subjected to wavelength selection by a post-optical fiber F-P filter, so that the problem that the signal to noise ratio is reduced or signals are annihilated due to the fact that light of a continuous detection light path or a pumping pulse light path directly enters a first photoelectric detector in the double-end measurement process is avoided.
The transmission light of the fiber grating array based on the continuous detection light path and the reflection light of the fiber grating array based on the pumping pulse light path are coupled and enter the first photoelectric detector at the same time, and at the moment, the signal acquisition and controller has two control modes of maximum light intensity detection and minimum light intensity detection.
In summary, the sensing system can effectively reduce the system cost by synchronously measuring the reflection/transmission of the fiber bragg grating and the single-system single fiber of the stimulated brillouin scattering signal of the fiber. Through the design of an optical system, static and dynamic simultaneous extraction of the whole and partial key strain/temperature information of the structure with a larger range and higher spatial precision can be realized.
Drawings
FIG. 1 is a schematic block diagram of a hybrid fiber optic sensing system according to an embodiment of the present invention;
wherein: 1. the laser 2, the fiber coupler 3, the continuous detection light path 31, the second fiber polarization controller 32, the second photoelectric modulator 33, the first fiber circulator 34, the fiber grating 35, the second fiber amplifier 36, the scrambler 4, the sensing fiber 41, the fiber grating 5, the pump pulse light path 51, the first fiber polarization controller 52, the first electro-optic modulator 53, the third fiber polarization controller 54, the third electro-optic modulator 55, the pulse generator 56, the first fiber amplifier 6, the second fiber circulator 7, the control system 71, the third fiber circulator 72, the fiber F-P filter 73, the sawtooth wave generator 74, the first photoelectric detector 75, the band-pass filter 76, the second photoelectric detector 77, and the signal acquisition and controller.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
As shown in fig. 1, an embodiment of the present invention discloses a hybrid fiber sensing system, which includes a laser 1, a fiber coupler 2, a continuous detection optical path 3, a sensing optical fiber 4, a pump pulse optical path 5, a second fiber circulator 6, and a control system 7. The output end of the laser 1 is divided into two paths after passing through the optical fiber coupler 2, the first path is connected with the input end of the continuous detection optical path 3, the second path is connected with the input end of the pumping pulse optical path 5, the output end of the continuous detection optical path 3 is connected with one input end of the second optical fiber circulator 6 through the sensing optical fiber 4, the output end of the pumping pulse optical path 5 is connected with the other input end of the second optical fiber circulator 6, and the output end of the second optical fiber circulator 6 is connected with the input end of the control system 7.
Preferably, the laser 1 is a narrow linewidth laser. The sensing optical fiber 4 is provided with an optical fiber grating array, and the optical fiber grating array comprises more than two optical fiber gratings 41.
Further, as shown in fig. 1, the continuous detection optical path includes a second fiber polarization controller 31, a second photoelectric modulator 32, a first fiber circulator 33, a fiber grating 34, a second fiber amplifier 35, and a scrambler 36. An output end of the optical fiber coupler 2 is connected with an input end of the first optical fiber polarization controller 31, an output end of the second optical fiber polarization controller 31 is connected with an input end of the second optical-electrical modulator 32, an output end of the second optical-electrical modulator 32 is connected with an input end of the first optical fiber circulator 33, the optical fiber grating 34 is connected with another input end of the first optical fiber circulator 33, an output end of the first optical fiber circulator 33 is connected with an input end of the second optical fiber amplifier 35, an output end of the second optical fiber amplifier 35 is connected with an input end of the scrambler 36, and an output end of the scrambler 36 is connected with one end of the sensing optical fiber 4.
Further, as shown in fig. 1, the pump pulse optical path 5 includes a first fiber polarization controller 51, a first electro-optic modulator 52, a third fiber polarization controller 53, a third electro-optic modulator 54, a pulse generator 55, and a first fiber amplifier 56. One output end of the optical fiber coupler 2 is connected to an input end of the first optical fiber polarization controller 51, an output end of the first optical fiber polarization controller 51 is connected to an input end of the first electro-optical modulator 52, an output end of the first electro-optical modulator 52 is connected to an input end of the third optical fiber polarizer 53, an output end of the third optical fiber polarizer 53 is connected to an input end of the third electro-optical modulator 54, an output end of the pulse generator 55 is connected to another input end of the third electro-optical modulator 54, an output end of the third electro-optical modulator 54 is connected to an input end of the first optical fiber amplifier 56, and an output end of the first optical fiber amplifier 56 is connected to an input end of the second optical fiber circulator 6.
Further, as shown in fig. 1, the control system 7 includes a third fiber circulator 71, a fiber F-P filter 72, a sawtooth generator 73, a first photodetector 74, a filter 75, a second photodetector 76, and a signal acquisition and controller 77. The output end of the second optical fiber circulator 6 is connected to the input end of the third optical fiber circulator 71, one output end of the third optical fiber circulator 71 is connected to one input end of the optical fiber F-P filter 72, the output end of the sawtooth wave generator 73 is connected to the other input end of the optical fiber F-P filter 72, the output end of the optical fiber F-P filter 72 is connected to one input end of the signal acquisition and controller 77 via the first photodetector 74, the other output end of the third optical fiber circulator 71 is connected to the input end of the band-pass filter 75, the output end of the band-pass filter 75 is connected to the other input end of the signal acquisition and controller 77 via the second photodetector 76, and one control output end of the signal acquisition and controller 77 is connected to the control end of the sawtooth wave generator 73.
The pump pulse light path 5 provides pulse broadband light, mainly covers 1510 nm-1600 nm wave bands, and can be used as a main light source of the fiber bragg grating array 41; in the wavelength band 1460 nm-1510 nm, the optical power of the pump pulse optical path 5 is lower than that of the continuous detection optical path 3, and the continuous detection optical path provides a light source for the fiber grating array 41; the dual light sources increase the system stability and expand the bandwidth of the fiber bragg grating in the sensing fiber 4, thereby improving the multiplexing quantity. Meanwhile, in order not to interfere with the detection of the stimulated Brillouin scattering signal of the optical fiber, the wavelength of the optical fiber grating should avoid the vicinity of 1550 nm; further, to obtain a better signal-to-noise ratio, the fiber grating wavelength should avoid the vicinity of the optical power intersection point of the pump pulse optical path 5 and the continuous detection optical path 3, and comprehensive consideration can be preferably given to 1460 nm-1515 nm band, 1525nm-1545nm, 1555nm-1575nm and 1585 nm-1600 nm.
The filter 75 is a band-pass filter, and the bandwidth is preferably 1545nm-1555nm, and the band-pass filter is used for introducing the reflected light and the transmitted light of the fiber bragg grating array 41 into the fiber F-P filter 72 through one output end of the third fiber circulator 71 for wavelength selection; the light passing through the band-pass filter 75 enters the second photodetector 76 as a detection end of the stimulated brillouin scattering.
The optical fiber grating array 41 is subjected to wavelength selection by the post-optical fiber F-P filter 72, so that the problem that the signal to noise ratio is reduced or signals are annihilated due to the fact that light emitted by the continuous detection light path 3 or the pumping pulse light path 5 directly enters the first photoelectric detector 74 in the double-end measurement process is avoided.
The transmitted light of the fiber grating array 41 based on the continuous detection light path 3 and the reflected light of the fiber grating array 41 based on the pumping pulse light path 5 are coupled and enter the first photoelectric detector 74 at the same time, and at the moment, the signal acquisition and controller 77 has two control modes of maximum light intensity detection and minimum light intensity detection, and both ensure a better signal to noise ratio.
Claims (6)
1. A hybrid fiber optic sensing system, characterized by: the device comprises a laser (1), an optical fiber coupler (2), a continuous detection optical path (3), a sensing optical fiber (4), a pumping pulse optical path (5), a second optical fiber circulator (6) and a control system (7), wherein the output end of the laser (1) is divided into two paths after passing through the optical fiber coupler (2), the first path is connected with the input end of the continuous detection optical path (3), the second path is connected with the input end of the pumping pulse optical path (5), the continuous detection optical path comprises a first optical fiber circulator (33) and an optical fiber grating (34), the optical fiber grating (34) is connected with the other input end of the first optical fiber circulator (33), the pumping pulse optical path (5) comprises a first optical fiber amplifier (56), the output end of the continuous detection optical path (3) is connected with one input end of the second optical fiber circulator (6) through the sensing optical fiber (4), the output end of the pumping pulse optical path (5) is connected with the other input end of the second optical fiber circulator (6), and the output end of the pumping pulse optical path (5) is connected with the control system (7);
the wavelength of the fiber grating avoids the vicinity of 1550nm, and simultaneously avoids the vicinity of the optical power intersection point of the pumping pulse optical path (5) and the continuous detection optical path (3); the wavelength of the fiber bragg grating is 1525nm-1545nm and 1555nm-1575nm;
the control system (7) comprises a third optical fiber circulator (71), an optical fiber F-P filter (72) and a band-pass filter (75), wherein the band-pass filter is arranged on the filter (75), the band width is 1545nm-1555nm, the output end of the second optical fiber circulator (6) is connected with the input end of the third optical fiber circulator (71), one output end of the third optical fiber circulator (71) is connected with one input end of the optical fiber F-P filter (72), and the other output end of the third optical fiber circulator (71) is connected with the input end of the band-pass filter (75).
2. The hybrid fiber optic sensing system of claim 1, wherein: the continuous detection optical path comprises a second optical fiber polarization controller (31), a second photoelectric modulator (32), a second optical fiber amplifier (35) and a scrambler (36), wherein one output end of the optical fiber coupler (2) is connected with the input end of the second optical fiber polarization controller (31), the output end of the second optical fiber polarization controller (31) is connected with the input end of the second photoelectric modulator (32), the output end of the second photoelectric modulator (32) is connected with one input end of the first optical fiber circulator (33), the output end of the first optical fiber circulator (33) is connected with the input end of the second optical fiber amplifier (35), the output end of the second optical fiber amplifier (35) is connected with the input end of the scrambler (36), and the output end of the scrambler (36) is connected with one end of the sensing optical fiber (4).
3. The hybrid fiber optic sensing system of claim 1, wherein: the pumping pulse optical path (5) comprises a first optical fiber polarization controller (51), a first electro-optic modulator (52), a third optical fiber polarization controller (53), a third electro-optic modulator (54) and a pulse generator (55); one output end of the optical fiber coupler (2) is connected with the input end of the first optical fiber polarization controller (51), the output end of the first optical fiber polarization controller (51) is connected with one input end of the first optical fiber modulator (52), the output end of the first optical fiber modulator (52) is connected with the input end of the third optical fiber polarizer (53), the output end of the third optical fiber polarizer (53) is connected with one input end of the third optical fiber modulator (54), the output end of the pulse generator (55) is connected with the other input end of the third optical fiber modulator (54), the output end of the third optical fiber modulator (54) is connected with the input end of the first optical fiber amplifier (56), and the output end of the first optical fiber amplifier (56) is connected with one input end of the second optical fiber circulator (6).
4. The hybrid fiber optic sensing system of claim 1, wherein: the control system (7) (7) comprises a sawtooth wave generator (73), a first photoelectric detector (74), a second photoelectric detector (76) and a signal acquisition and control device (77), wherein the output end of the sawtooth wave generator (73) is connected with the other input end of the optical fiber F-P filter (72), the output end of the optical fiber F-P filter (72) is connected with one input end of the signal acquisition and control device (77) through the first photoelectric detector (74), the output end of the filter (75) is connected with the other input end of the signal acquisition and control device (77) through the second photoelectric detector (76), and one control output end of the signal acquisition and control device (77) is connected with the control end of the sawtooth wave generator (73).
5. The hybrid fiber optic sensing system of claim 1, wherein: the laser (1) is a narrow linewidth laser.
6. The hybrid fiber optic sensing system of claim 5, wherein: the fiber grating array includes two or more fiber gratings (41).
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