CN103162724A - Optical fiber grating sensor demodulation instrument and method based on dynamic scanning - Google Patents
Optical fiber grating sensor demodulation instrument and method based on dynamic scanning Download PDFInfo
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Abstract
The invention relates to a technology of demodulation of optical fiber gratings, in particular to an optical fiber grating sensor demodulation instrument and an optical fiber grating sensor demodulation method based on dynamic scanning and aims to solve the problems that the demodulation speed and the demodulation accuracy in the conventional optical fiber grating demodulation technology are low, and the conventional demodulation instrument is inconvenient to use and high in using cost and has a narrow application range. The demodulation instrument comprises a broadband light source, a tunable filter, an optical fiber coupler, an isolation device, an optical fiber grating, an etalon, a first photoelectric detector, a second photoelectric detector, a first signal amplification and conditioning circuit, a second signal amplification and conditioning circuit, a multi-path synchronous analog/digital (A/D) converter, a field programmable gate array (FPGA)-based demodulation control circuit, a computer, a D/A converter and a high-voltage driving amplifying circuit and is applicable to optical fiber grating sensors.
Description
Technical field
The present invention relates to the demodulation techniques of fiber grating, specifically a kind of optical fiber grating sensing demodulator and method based on dynamic scan.
Background technology
Fiber grating can convert extraneous strain signal (as stress signal, strain signal, vibration signal, temperature variation signal etc.) to the center wavelength variation signal of self reflectance spectrum.Therefore, by fiber grating is suitably encapsulated, just can be made into fiber-optic grating sensor.Fiber-optic grating sensor is because of characteristics such as it has the electromagnetic interference of not being subjected to, volume is little, making is simple, wavelength sensitive, is widely used in remote optical sensing and optical communication field.In actual applications, can work in order to guarantee fiber-optic grating sensor, must carry out demodulation to fiber grating.At present, the demodulation techniques of fiber grating mainly are divided into: one, spectral analysis technique.This kind Technology Need carries out a large amount of mathematical computations, thereby its demodulation speed is low, the measurement that is not suitable for large bandwidth strain signal.Two, based on the length scanning technology of tunable optic filter.This kind technology wavelength resolution is high, measurement range is wide, multiplexing capacity is strong, but its demodulation speed is low, use cost is high, measurement when being suitable at a high speed with high-accuracy wide-range dynamic strain signal.Three, boundary filter technology.This kind Technology Need is special boundary filter and the detector of each fiber grating configuration, thereby its use is inconvenient, use cost is high.Four, unbalanced M-Z interferometer demodulation techniques.There is Zero drift in main amplifier in this kind technology, thereby it is only applicable to the measurement of dynamic strain signal.Five, intensity modulation type optical fiber grating regulating system.This kind technology demodulation speed is high, but affected by self nonlinear characteristic, and its demodulation accuracy is low.In sum, the demodulation techniques of existing fiber grating are because self principle is limit, and the ubiquity demodulation speed is low, demodulation accuracy is low, use is inconvenient, use cost is high and the problem of narrow application range.Be necessary to invent a kind of demodulation techniques of brand-new fiber grating, the problems referred to above that exist with the demodulation techniques that solve the existing fiber grating for this reason.
Summary of the invention
The present invention is low for the demodulation techniques demodulation speed that solves the existing fiber grating, demodulation accuracy is low, use is inconvenient, use cost is high and the problem of narrow application range, and a kind of optical fiber grating sensing demodulator based on dynamic scan and method are provided.
The present invention adopts following technical scheme to realize: based on the optical fiber grating sensing demodulator of dynamic scan, comprise that wideband light source, tunable optic filter, fiber coupler, isolator, fiber grating, etalon, the first photodetector, the second photodetector, first signal amplify modulate circuit, secondary signal is amplified modulate circuit, Multi-path synchronous A/D converter, the demodulation control circuit based on FPGA, computing machine, D/A converter and high drive amplifying circuit; Wherein, the signal output part of wideband light source is connected with the signal input part of tunable optic filter; The signal output part of tunable optic filter is connected with the signal input part of fiber coupler; The signal output part of fiber coupler is connected with the signal input part of the signal input part of isolator, fiber grating, the signal input part of the first photodetector; The signal output part of isolator is connected with the signal input part of etalon; The signal output part of etalon is connected with the signal input part of the second photodetector; The signal output part of the first photodetector is connected with the signal input part that first signal amplifies modulate circuit; The signal output part of the second photodetector is connected with the signal input part that secondary signal is amplified modulate circuit; First signal amplifies the signal output part of modulate circuit, the signal output part that secondary signal is amplified modulate circuit all is connected with the signal input part of Multi-path synchronous A/D converter; The signal output part of Multi-path synchronous A/D converter is connected with signal input part based on the demodulation control circuit of FPGA; Signal output part based on the demodulation control circuit of FPGA is connected with the signal input part of Multi-path synchronous A/D converter, the signal input part of computing machine, the signal input part of D/A converter; The signal output part of D/A converter is connected with the signal input part of high drive amplifying circuit; The signal output part of high drive amplifying circuit is connected with the signal input part of tunable optic filter.
Based on the fiber grating sensing demodulation method (the method is completed in the optical fiber grating sensing demodulator based on dynamic scan of the present invention) of dynamic scan, the method is to adopt following steps to realize:
A. wideband light source is exported broadband light to tunable optic filter; Tunable optic filter converts the broadband light of input to narrow-linewidth laser, and exports narrow-linewidth laser to fiber coupler; Fiber coupler is coupled the narrow-linewidth laser of input, and the narrow-linewidth laser after being coupled exports fiber grating to, and the narrow-linewidth laser after being coupled by isolator simultaneously exports etalon to;
B. fiber grating forms reflectance spectrum according to the narrow-linewidth laser of input; The reflectance spectrum that the first photodetector real-time detection forms, and export the reflectance spectrum that detects to first signal amplification modulate circuit; First signal amplifies modulate circuit the reflectance spectrum of inputting is amplified conditioning; Simultaneously, etalon forms transmission spectrum according to the narrow-linewidth laser of input; The transmission spectrum that the second photodetector real-time detection forms, and export the transmission spectrum that detects to secondary signal amplification modulate circuit; Secondary signal is amplified modulate circuit the transmission spectrum of inputting is amplified conditioning;
C. reflectance spectrum and the transmission spectrum after conditioning amplified in the collection of Multi-path synchronous A/D converter real-time synchronization, and exports the reflectance spectrum that collects and transmission spectrum to based on FPGA demodulation control circuit; In the high-voltage driven signal of initial triangular voltage sweep cycle Real-time Collection tunable optic filter and the Mag Flag characteristic wavelength position of etalon, and export the high-voltage driven signal that collects and reflectance spectrum and the transmission spectrum of Mag Flag characteristic wavelength position and input to computing machine based on the demodulation control circuit of FPGA;
D. the demodulation control circuit based on FPGA produces high-voltage driven signal according to the reflectance spectrum of inputting, and exports the high-voltage driven signal that produces to D/A converter; D/A converter carries out digital-to-analog conversion with the high-voltage driven signal of input, and exports the high-voltage driven signal after digital-to-analog conversion to the high drive amplifying circuit; The high drive amplifying circuit amplifies the high-voltage driven signal of input, and the high-voltage driven signal after amplifying exports tunable optic filter to; Regulate in real time the scanning voltage of tunable optic filter according to the reflectance spectrum of input based on the demodulation control circuit of FPGA, make tunable optic filter output narrow-linewidth laser wavelength locking reflectance spectrum-the 3dB position;
E. when fiber grating was subject to extraneous strain signal, the centre wavelength of reflectance spectrum changed, and the centre wavelength of each peak value of transmission spectrum remains unchanged; Repeating step d, make the wavelength of the narrow-linewidth laser of tunable optic filter output relock reflectance spectrum-the 3dB position; Computing machine according to high-voltage driven signal, Mag Flag characteristic wavelength position, reflectance spectrum, the transmission spectrum of input calculate reflectance spectrum-variable quantity of the center of each peak value of the relative transmission spectrum in 3dB position, and go out the center wavelength variation signal of reflectance spectrum according to the variable quantity real-time resolving that calculates, then bring the calibration coefficient of fiber grating into, and go out extraneous strain signal according to the calibration coefficient of bringing into and the center wavelength variation signal real-time resolving that calculates.
In described step c, the preliminary sweep voltage of tunable optic filter is triangular voltage sweep voltage; In described steps d, demodulation control circuit based on FPGA is sought the maximal value of reflectance spectrum at the rising edge of triangular voltage sweep voltage, and regulate bias voltage and the peak-to-peak value scope of the scanning voltage of tunable optic filter at the negative edge of triangular voltage sweep voltage according to the maximum value position of the reflectance spectrum that searches out, make tunable optic filter output narrow-linewidth laser wavelength locking reflectance spectrum-the 3dB position; Be divided into several intervals based on the demodulation control circuit of FPGA according to the reflectance spectrum peak value of the large young pathbreaker's input of reflectance spectrum peak value of input, and produce the high-voltage driven signal with different scanning step-length according to different intervals.
Compare with the demodulation techniques of existing fiber grating, optical fiber grating sensing demodulator and method based on dynamic scan of the present invention has following advantage: one, compare with spectral analysis technique, optical fiber grating sensing demodulator and method based on dynamic scan of the present invention need not to carry out a large amount of mathematical computations, thereby its demodulation speed is higher, is applicable to the measurement of large bandwidth strain signal fully.Two, compare with the length scanning technology based on tunable optic filter, optical fiber grating sensing demodulator and method demodulation speed based on dynamic scan of the present invention is higher, use cost is lower, measures when being applicable at a high speed with high-accuracy wide-range dynamic strain signal fully.Three, compare with the boundary filter technology, optical fiber grating sensing demodulator and the method based on dynamic scan of the present invention need not to be special boundary filter and the detector of each fiber grating configuration, thereby its use is more convenient, and use cost is lower.Four, compare with the unbalanced M-Z interferometer demodulation techniques, there is not zero point drift in optical fiber grating sensing demodulator and the method based on dynamic scan of the present invention, thereby it is not only applicable to the measurement of dynamic strain signal.Five, compare with the intensity modulation type optical fiber grating regulating system, optical fiber grating sensing demodulator and the method based on dynamic scan of the present invention do not affected by nonlinear characteristic, thereby its demodulation accuracy is higher.In sum, of the present invention based on dynamic scan optical fiber grating sensing demodulator and method based on the brand new principle, the demodulation techniques demodulation speed that efficiently solves the existing fiber grating is low, demodulation accuracy is low, use is inconvenient, use cost is high and the problem of narrow application range.
The demodulation techniques demodulation speed that the present invention efficiently solves the existing fiber grating is low, demodulation accuracy is low, use is inconvenient, use cost is high and the problem of narrow application range, is applicable to fiber-optic grating sensor.
Description of drawings
Fig. 1 is based on the structural representation of the optical fiber grating sensing demodulator of dynamic scan in the present invention.
Fig. 2 is the curve synoptic diagram of the wavelength of the centre wavelength of the reflectance spectrum that in the present invention, fiber grating forms and the narrow-linewidth laser that tunable optic filter is exported.
Fig. 3 is the curve synoptic diagram of the reflectance spectrum that in the present invention, fiber grating forms.
Fig. 4 is the curve synoptic diagram of the transmission spectrum of Plays tool formation of the present invention.
Fig. 5 is the curve synoptic diagram of the scanning voltage of tunable optic filter in the present invention.
Fig. 6 is the drift value curve synoptic diagram of centre wavelength under the static strain condition of the reflectance spectrum that in the present invention, fiber grating forms.
Fig. 7 is the reflectance spectrum of fiber grating formation in the present invention and the curve synoptic diagram of scanning voltage under 2kHz dynamic strain signal of tunable optic filter.
Fig. 8 is the curve synoptic diagram of centre wavelength under 2kHz dynamic strain signal of the reflectance spectrum that in the present invention, fiber grating forms.
In figure: 1-wideband light source, 2-tunable optic filter, 3-fiber coupler, the 4-isolator, 5-fiber grating, 6-etalon, 7-the first photodetector, 8-the second photodetector, the 9-first signal amplifies modulate circuit, the 10-secondary signal is amplified modulate circuit, 11-Multi-path synchronous A/D converter, 12-is based on the demodulation control circuit of FPGA, 13-computing machine, the 14-D/A converter, 15-high drive amplifying circuit.
Embodiment
Based on the optical fiber grating sensing demodulator of dynamic scan, comprise that wideband light source 1, tunable optic filter 2, fiber coupler 3, isolator 4, fiber grating 5, etalon 6, the first photodetector 7, the second photodetector 8, first signal amplify modulate circuit 9, secondary signal is amplified modulate circuit 10, Multi-path synchronous A/D converter 11, the demodulation control circuit 12 based on FPGA, computing machine 13, D/A converter 14 and high drive amplifying circuit 15; Wherein, the signal output part of wideband light source 1 is connected with the signal input part of tunable optic filter 2; The signal output part of tunable optic filter 2 is connected with the signal input part of fiber coupler 3; The signal output part of fiber coupler 3 is connected with the signal input part of isolator 4, the signal input part of fiber grating 5, the signal input part of the first photodetector 7; The signal output part of isolator 4 is connected with the signal input part of etalon 6; The signal output part of etalon 6 is connected with the signal input part of the second photodetector 8; The signal output part of the first photodetector 7 is connected with the signal input part that first signal amplifies modulate circuit 9; The signal output part of the second photodetector 8 is connected with the signal input part that secondary signal is amplified modulate circuit 10; First signal amplifies the signal output part of modulate circuit 9, the signal output part that secondary signal is amplified modulate circuit 10 all is connected with the signal input part of Multi-path synchronous A/D converter 11; The signal output part of Multi-path synchronous A/D converter 11 is connected with signal input part based on the demodulation control circuit 12 of FPGA; Signal output part based on the demodulation control circuit 12 of FPGA is connected with the signal input part of Multi-path synchronous A/D converter 11, the signal input part of computing machine 13, the signal input part of D/A converter 14; The signal output part of D/A converter 14 is connected with the signal input part of high drive amplifying circuit 15; The signal output part of high drive amplifying circuit 15 is connected with the signal input part of tunable optic filter 2.
Based on the fiber grating sensing demodulation method (the method is completed in the optical fiber grating sensing demodulator based on dynamic scan of the present invention) of dynamic scan, the method is to adopt following steps to realize:
A. wideband light source 1 is to tunable optic filter 2 output broadband light; Tunable optic filter 2 converts the broadband light of input to narrow-linewidth laser, and exports narrow-linewidth laser to fiber coupler 3; Fiber coupler 3 is coupled the narrow-linewidth laser of input, and the narrow-linewidth laser after being coupled exports fiber grating 5 to, and the narrow-linewidth laser after being coupled by isolator 4 simultaneously exports etalon 6 to;
C. reflectance spectrum and the transmission spectrum after conditioning amplified in the 11 real-time synchronization collections of Multi-path synchronous A/D converter, and exports the reflectance spectrum that collects and transmission spectrum to based on FPGA demodulation control circuit 12; In the high-voltage driven signal of initial triangular voltage sweep cycle Real-time Collection tunable optic filter 2 and the Mag Flag characteristic wavelength position of etalon 6, and export the high-voltage driven signal that collects and reflectance spectrum and the transmission spectrum of Mag Flag characteristic wavelength position and input to computing machine 13 based on the demodulation control circuit 12 of FPGA;
D. the demodulation control circuit 12 based on FPGA produces high-voltage driven signal according to the reflectance spectrum of inputting, and exports the high-voltage driven signal that produces to D/A converter 14; D/A converter 14 carries out digital-to-analog conversion with the high-voltage driven signal of input, and exports the high-voltage driven signal after digital-to-analog conversion to high drive amplifying circuit 15; High drive amplifying circuit 15 amplifies the high-voltage driven signal of input, and the high-voltage driven signal after amplifying exports tunable optic filter 2 to; Regulate in real time the scanning voltage of tunable optic filter 2 according to the reflectance spectrum of input based on the demodulation control circuit 12 of FPGA, make tunable optic filter 2 outputs narrow-linewidth laser wavelength locking reflectance spectrum-the 3dB position;
E. when fiber grating 5 was subject to extraneous strain signal, the centre wavelength of reflectance spectrum changed, and the centre wavelength of each peak value of transmission spectrum remains unchanged; Repeating step d, make the wavelength of the narrow-linewidth laser of tunable optic filter 2 output relock reflectance spectrum-the 3dB position; Computing machine 13 according to high-voltage driven signal, Mag Flag characteristic wavelength position, reflectance spectrum, the transmission spectrum of input calculate reflectance spectrum-variable quantity of the center of each peak value of the relative transmission spectrum in 3dB position, and go out the center wavelength variation signal of reflectance spectrum according to the variable quantity real-time resolving that calculates, then bring the calibration coefficient of fiber grating 5 into, and go out extraneous strain signal according to the calibration coefficient of bringing into and the center wavelength variation signal real-time resolving that calculates.
In described step c, the preliminary sweep voltage of tunable optic filter 2 is triangular voltage sweep voltage; In described steps d, demodulation control circuit 12 based on FPGA is sought the maximal value of reflectance spectrum at the rising edge of triangular voltage sweep voltage, and regulate bias voltage and the peak-to-peak value scope of the scanning voltage of tunable optic filter 2 at the negative edge of triangular voltage sweep voltage according to the maximum value position of the reflectance spectrum that searches out, make tunable optic filter 2 outputs narrow-linewidth laser wavelength locking reflectance spectrum-the 3dB position; Be divided into several intervals based on the demodulation control circuit 12 of FPGA according to the reflectance spectrum peak value of the large young pathbreaker's input of reflectance spectrum peak value of input, and produce the high-voltage driven signal with different scanning step-length according to different intervals.
During concrete enforcement, described wideband light source 1 adopts the power light source (band is wider than 40nm, and wavelength coverage is 1520nm ~ 1560nm, and general power is greater than 10mW) with higher gain flatness.The output linewidth of described tunable optic filter 2 is better than 0.01nm, and the wavelength coverage of the narrow-linewidth laser of tunable optic filter 2 outputs is 1520nm ~ 1560nm.Described Multi-path synchronous A/D converter 11 adopts multipath high-speed synchronous serial A/D converter.
Claims (3)
1. optical fiber grating sensing demodulator based on dynamic scan, it is characterized in that: comprise wideband light source (1), tunable optic filter (2), fiber coupler (3), isolator (4), fiber grating (5), etalon (6), the first photodetector (7), the second photodetector (8), first signal amplifies modulate circuit (9), secondary signal is amplified modulate circuit (10), Multi-path synchronous A/D converter (11), demodulation control circuit (12) based on FPGA, computing machine (13), D/A converter (14), and high drive amplifying circuit (15), wherein, the signal output part of wideband light source (1) is connected with the signal input part of tunable optic filter (2), the signal output part of tunable optic filter (2) is connected with the signal input part of fiber coupler (3), the signal output part of fiber coupler (3) is connected with the signal input part of the signal input part of isolator (4), fiber grating (5), the signal input part of the first photodetector (7), the signal output part of isolator (4) is connected with the signal input part of etalon (6), the signal output part of etalon (6) is connected with the signal input part of the second photodetector (8), the signal output part of the first photodetector (7) is connected with the signal input part that first signal amplifies modulate circuit (9), the signal output part of the second photodetector (8) is connected with the signal input part that secondary signal is amplified modulate circuit (10), first signal amplifies the signal output part of modulate circuit (9), the signal output part that secondary signal is amplified modulate circuit (10) all is connected with the signal input part of Multi-path synchronous A/D converter (11), the signal output part of Multi-path synchronous A/D converter (11) is connected with signal input part based on the demodulation control circuit (12) of FPGA, signal output part based on the demodulation control circuit (12) of FPGA is connected with the signal input part of Multi-path synchronous A/D converter (11), the signal input part of computing machine (13), the signal input part of D/A converter (14), the signal output part of D/A converter (14) is connected with the signal input part of high drive amplifying circuit (15), the signal output part of high drive amplifying circuit (15) is connected with the signal input part of tunable optic filter (2).
2. fiber grating sensing demodulation method based on dynamic scan, the method is completed in the optical fiber grating sensing demodulator based on dynamic scan as claimed in claim 1, it is characterized in that: the method is to adopt following steps to realize:
A. wideband light source (1) is to tunable optic filter (2) output broadband light; Tunable optic filter (2) converts the broadband light of input to narrow-linewidth laser, and exports narrow-linewidth laser to fiber coupler (3); Fiber coupler (3) is coupled the narrow-linewidth laser of input, and the narrow-linewidth laser after being coupled exports fiber grating (5) to, and the narrow-linewidth laser after being coupled by isolator (4) simultaneously exports etalon (6) to;
B. fiber grating (5) forms reflectance spectrum according to the narrow-linewidth laser of input; The reflectance spectrum that the first photodetector (7) real-time detection forms, and export the reflectance spectrum that detects to first signal amplification modulate circuit (9); First signal amplifies modulate circuit (9) reflectance spectrum of inputting is amplified conditioning; Simultaneously, etalon (6) forms transmission spectrum according to the narrow-linewidth laser of input; The transmission spectrum that the second photodetector (8) real-time detection forms, and export the transmission spectrum that detects to secondary signal amplification modulate circuit (10); Secondary signal is amplified modulate circuit (10) transmission spectrum of inputting is amplified conditioning;
C. reflectance spectrum and the transmission spectrum after conditioning amplified in Multi-path synchronous A/D converter (11) real-time synchronization collection, and exports the reflectance spectrum that collects and transmission spectrum to based on FPGA demodulation control circuit (12); In the high-voltage driven signal of initial triangular voltage sweep cycle Real-time Collection tunable optic filter (2) and the Mag Flag characteristic wavelength position of etalon (6), and export the high-voltage driven signal that collects and reflectance spectrum and the transmission spectrum of Mag Flag characteristic wavelength position and input to computing machine (13) based on the demodulation control circuit (12) of FPGA;
D. the demodulation control circuit (12) based on FPGA produces high-voltage driven signal according to the reflectance spectrum of inputting, and exports the high-voltage driven signal that produces to D/A converter (14); D/A converter (14) carries out digital-to-analog conversion with the high-voltage driven signal of input, and exports the high-voltage driven signal after digital-to-analog conversion to high drive amplifying circuit (15); High drive amplifying circuit (15) amplifies the high-voltage driven signal of input, and the high-voltage driven signal after amplifying exports tunable optic filter (2) to; Regulate in real time the scanning voltage of tunable optic filter (2) according to the reflectance spectrum of input based on the demodulation control circuit (12) of FPGA, make tunable optic filter (2) output narrow-linewidth laser wavelength locking reflectance spectrum-the 3dB position;
E. when fiber grating (5) when being subject to extraneous strain signal, the centre wavelength of reflectance spectrum changes, and the centre wavelength of each peak value of transmission spectrum remains unchanged; Repeating step d, make the wavelength of the narrow-linewidth laser of tunable optic filter (2) output relock reflectance spectrum-the 3dB position; Computing machine (13) according to high-voltage driven signal, Mag Flag characteristic wavelength position, reflectance spectrum, the transmission spectrum of input calculate reflectance spectrum-variable quantity of the center of each peak value of the relative transmission spectrum in 3dB position, and go out the center wavelength variation signal of reflectance spectrum according to the variable quantity real-time resolving that calculates, then bring the calibration coefficient of fiber grating (5) into, and go out extraneous strain signal according to the calibration coefficient of bringing into and the center wavelength variation signal real-time resolving that calculates.
3. the fiber grating sensing demodulation method based on dynamic scan according to claim 2, it is characterized in that: in described step c, the preliminary sweep voltage of tunable optic filter (2) is triangular voltage sweep voltage; In described steps d, demodulation control circuit (12) based on FPGA is sought the maximal value of reflectance spectrum at the rising edge of triangular voltage sweep voltage, and regulate bias voltage and the peak-to-peak value scope of the scanning voltage of tunable optic filter (2) at the negative edge of triangular voltage sweep voltage according to the maximum value position of the reflectance spectrum that searches out, make tunable optic filter (2) output narrow-linewidth laser wavelength locking reflectance spectrum-the 3dB position; Be divided into several intervals based on the demodulation control circuit (12) of FPGA according to the reflectance spectrum peak value of the large young pathbreaker's input of reflectance spectrum peak value of input, and produce the high-voltage driven signal with different scanning step-length according to different intervals.
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| CN106895861B (en) * | 2017-01-20 | 2019-05-31 | 南昌航空大学 | A kind of fiber optic high-resolution optical grating reflection spectrum acquisition method based on multiple A/D module samples |
| CN108896077A (en) * | 2018-07-26 | 2018-11-27 | 吉林大学 | A kind of wavelength extracting method of fiber-optic grating sensor |
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| CN109470285A (en) * | 2018-11-23 | 2019-03-15 | 山东航天电子技术研究所 | A kind of high-precision high-speed fiber grating sensor wavelength demodulation method |
| CN109470403A (en) * | 2018-12-14 | 2019-03-15 | 北京航空航天大学 | A kind of power based on fiber grating/torque sensor scaling method |
| CN109470403B (en) * | 2018-12-14 | 2020-07-28 | 北京航空航天大学 | Force/torque sensor calibration method based on fiber bragg grating |
| CN112378343A (en) * | 2020-11-12 | 2021-02-19 | 新疆大学 | System and method for dynamically detecting multipath strain of planetary gear box of wind driven generator |
| CN113551701A (en) * | 2021-06-19 | 2021-10-26 | 湖北经济学院 | Bus type fiber grating demodulation system |
| CN114414089A (en) * | 2022-03-29 | 2022-04-29 | 武汉奇测科技有限公司 | Device and method for simultaneously improving demodulation speed and measurement range of fiber bragg grating |
| CN114414089B (en) * | 2022-03-29 | 2022-06-17 | 武汉奇测科技有限公司 | Method for simultaneously improving demodulation speed and measuring range of fiber bragg grating |
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