CN103344194B - Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator - Google Patents
Phase-shifting fiber Bragg grating strain sensing system based on photoelectric oscillator Download PDFInfo
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Abstract
A phase-shifting fiber Bragg grating strain sensing system based on a photoelectric oscillator comprises a wave-length tunable laser; an input end of a polarization controller is connected with an output end of the wave-length tunable laser; a light input end of a phase modulator is connected with an output end of the polarization controller; an end a of an optical circulator is connected with an output end of the phase modulator; one end of a phase fiber Bragg grating pi is connected with an end b of the optical circulator; an input end of a photoelectric detector is connected with an end c of the optical circulator; an input end of a microwave power beam splitter is connected with an output end of the photoelectric detector; an input end of a microwave power amplifier is connected with a first output end of the microwave power beam splitter; an output end of the microwave power amplifier is connected with a radio frequency input end of the phase modulator; an input end of a frequency spectrograph is connected with a second output end of the microwave power beam splitter.
Description
Technical field
The invention belongs to sensory field of optic fibre, particularly a kind of phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator.
Background technology
Fibre Optical Sensor is a key areas of 21 century sensing technology, and its development directly has influence on the progress of many industries.Fiber Bragg grating sensor is a kind of wavelength-modulated type Fibre Optical Sensor, and its mechanism obtains heat transfer agent by the modulation of extraneous physical parameter to optical fiber Bragg wavelength.Because it has not by electromagnetic interference influence, the advantage not available for traditional sensors such as electrical insulating property is good, volume is little, lightweight, transmission capacity is large, test specification is wide and enjoy people parent to look at.
The movement of the optical fiber Bragg wavelength that extraneous physical parameter causes, can be recorded by optical filter such as boundary filter, optical fibre Fabry-perot oscillator, two arm interferometer equiwavelength demodulation.Sensing resolution depends on the optical filter for Wavelength demodulation.By means of the resonance response characteristic that it is very narrow, π phase shift bragg grating is widely used in improving wavelength decoding resolution.At present, up-to-date wavelength decoding scheme can realize resolution and reach 1pm.But these schemes all cannot avoid the mutual restriction between resolution and measurement range, namely the raising of resolution can cause the minimizing of measurement range, and vice versa.
Summary of the invention
In view of above-mentioned technical matters, the invention provides a kind of phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator, the accurate measurement realized phase shift optical fiber Bragg optical grating strain amount is moved by the wavelength of area of light being moved the microwave signal frequency converting electrical domain to, avoid the mutual restriction between resolution and measurement range, there is the advantages such as resolution is high, signal to noise ratio (S/N ratio) is high, measurement range is wide.
The invention provides a kind of phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator, comprising:
One Wavelength tunable laser, this Wavelength tunable laser is that single longitudinal mode exports;
One Polarization Controller, the input end of this Polarization Controller is connected with the output terminal of Wavelength tunable laser, exports polarisation of light state in order to adjusting wavelength tunable laser, reduces the Polarization Dependent Loss of light in transmitting procedure;
One phase-modulator, the light input end of this phase-modulator is connected with the output terminal of Polarization Controller, for carrying out phase-modulation to input optical signal;
One optical circulator, a end of this optical circulator is connected with the output terminal of phase-modulator;
One π phase shift bragg grating, one end of this π phase shift bragg grating is held with the b of optical circulator and is connected, for the specific modulation frequency in filtering modulated light signal;
One photodetector, the input end of this photodetector is held with the c of optical circulator and is connected;
One microwave power beam splitter, the input end of this microwave power beam splitter is connected with the output terminal of photodetector;
One microwave power amplifier, the input end of this microwave power amplifier is connected with the first output terminal of microwave power beam splitter, the output terminal of this microwave power amplifier is connected with the rf inputs of phase-modulator, in order to amplify photodetector beat frequency microwave signal power;
One frequency spectrograph, the input end of this frequency spectrograph is connected with the second output terminal of microwave power beam splitter.
As can be seen from technique scheme, the present invention has following beneficial effect:
1. the phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator provided by the invention, it is the movement strain of phase shift optical fiber Bragg grating being converted to resonance wavelength, its wavelength resolution is only limited by oscillator vibrates mode spacing, and finally measure in electrical domain, thus there is very high resolution, i.e. detectable very small dependent variable.
2. the phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator provided by the invention, due to the use of optical-electronic oscillator, can suppress phase noise well, the demodulation signal to noise ratio (S/N ratio) that wavelength moves (namely frequency shifts) significantly improves.
3. the phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator provided by the invention, by improving the bandwidth of microwave power amplifier, phase-modulator, photodetector and phase shift bragg grating, its measurement range can be made to reach tens GHzs, overcome the mutual restriction between resolution and measurement range.
Accompanying drawing explanation
In order to further illustrate technology contents of the present invention, below in conjunction with Figure of description, detailed elaboration is done to the present invention, wherein:
Fig. 1 is structural representation of the present invention;
Fig. 2 is principle of the invention schematic diagram;
Fig. 3 is the resonance wave spectrogram that system produces;
Fig. 4 is system phase noise pattern;
Fig. 5 is the microwave signal spectrogram of the present invention in differently strained lower generation;
Fig. 6 is the graph of a relation between the microwave signal frequency that produces of dependent variable and system.
Embodiment
Refer to shown in Fig. 1, the invention provides a kind of phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator, comprising:
One Wavelength tunable laser 1, this Wavelength tunable laser 1 exports in single longitudinal mode, and described Wavelength tunable laser 1 is outside cavity gas laser, sampling grating semiconductor laser or fiber laser;
One Polarization Controller 2, the input end of this Polarization Controller 2 is connected with the output terminal of Wavelength tunable laser 1, exports polarisation of light state in order to adjusting wavelength tunable laser, reduces the Polarization Dependent Loss of light in transmitting procedure;
One phase-modulator 3, the light input end of this phase-modulator 3 is connected with the output terminal of Polarization Controller 2, for carrying out phase-modulation to input optical signal;
One optical circulator 4, a end of this circulator 4 is connected with the output terminal of phase-modulator 3;
One π phase shift bragg grating 5, one end of this π phase shift bragg grating 5 is held with the b of optical circulator 4 and is connected, for the specific modulation frequency in filtering modulated light signal;
One photodetector 6, the input end of this photodetector 6 is held with the c of optical circulator 4 and is connected;
One microwave power beam splitter 7, the input end of this microwave power beam splitter 7 is connected with the output terminal of photodetector 6;
One microwave power amplifier 8, the input end of this microwave power amplifier 8 is connected with the first output terminal of microwave power beam splitter 7, the output terminal of this microwave power amplifier 8 is connected with the rf inputs of phase-modulator 3, in order to amplify photodetector beat frequency microwave signal power;
One frequency spectrograph 9, the input end of this frequency spectrograph 9 is connected with the second output terminal of microwave power beam splitter 7.
Wherein between tunable laser 1 with Polarization Controller 2, between phase-modulator 3 with Polarization Controller 2, between optical circulator 4 with phase-modulator 3, π phase shift bragg grating 5 with between optical circulator 4, be connected with standard single-mode fiber between photodetector 6 with optical circulator 4, connect with standard radio frequency connecting line between all the other devices.
Consult shown in Fig. 2, the principle of the invention is as follows:
The light ω that Wavelength tunable laser 1 produces
0enter phase-modulator 3 and carry out phase-modulation, when system is just started working, modulation signal is system noise, and it has very wide frequency content, and the signal thus after modulation has a lot of sideband.Signal after modulation enters π phase shift bragg grating 5 by optical circulator 4, as one of them sideband ω
0-ω
ewill by filtering when being arranged in the very narrow transmission window of π phase shift bragg grating 5 reflectance spectrum, corresponding sideband ω
0+ ω
ephotodetector 6 and light carrier ω is entered by optical circulator 4
0it is ω that beat frequency produces frequency
emicrowave.Other sidebands enter photodetector 6, because its upper side band is contrary with the beat signal phase place of corresponding lower sideband and carrier wave with the beat signal of carrier wave, thus cancels out each other, only produce direct current signal.The frequency that beat frequency produces is ω
emicrowave through microwave beam splitter 7, a part is input in frequency spectrograph 9, a part by being input to phase-modulator 3 after microwave power amplifier 8, continue that light is inputted to Wavelength tunable laser 1 and modulate, formed electro-optical feedback loop.And so forth, frequency is ω
emicrowave will become large gradually by little, set up self-sustained oscillation and finally reach stable, namely constituting optical-electronic oscillator structure.When external environment causes π phase shift bragg grating 5 that strain occurs, its transmission window also will produce corresponding mobile, the wavelength of area of light moves the microwave signal frequency finally converting electrical domain to and moves, thus achieves the accurate measurement to π phase shift optical fiber Bragg grating 5 dependent variable.
Fig. 3 is the resonance wave spectrogram that system produces, and its spectral pattern is corresponding with the transmission window in π phase shift bragg grating 5 reflectance spectrum.Because transmission window is very narrow, the resonance wave single-frequency thus obtained is good.Optical-electronic oscillator has higher Q value, can suppress phase noise well, and the demodulation signal to noise ratio (S/N ratio) that therefore wavelength moves (namely frequency shifts) significantly improves.
Fig. 4 is system phase noise pattern, and there will be the oscillation peaks of equifrequent interval (frequency interval is also fr) away from resonance wave centre frequency fr place, the peak-to-peak frequency interval of this vibration corresponds to system optical-electronic oscillator longitudinal mode spacing.When external environment causes π phase shift bragg grating 5 resonance wavelength to change, the frequency shifts that the microwave signal that system exports will take resolution as fr.By increasing optical-electronic oscillator Resonant Intake System, be easy to obtain higher systemic resolution.
Fig. 5 is the microwave signal spectrogram of the present invention in differently strained lower generation, it is corresponding mobile that different strains makes π phase shift bragg grating 5 transmission window occur, thus obtaining different harmonic peak output, the wavelength achieving area of light moves the microwave signal frequency converting electrical domain to and moves.By improving the bandwidth of microwave power amplifier 8, phase-modulator 2, photodetector 6 and π phase shift bragg grating 5, measurement range reaches tens GHzs, overcomes the mutual restriction between resolution and measurement range.
Fig. 6 is the graph of a relation between the microwave signal frequency that produces of dependent variable and system, finds out, can be learnt the dependent variable that π phase shift bragg grating 5 produces namely achieving sensing function by wavelength decoding by the harmonic peak frequency recorded from graph of a relation.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; be understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any amendment made, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1., based on a phase shift optical fiber Bragg optical grating strain sensor-based system for optical-electronic oscillator, comprising:
One Wavelength tunable laser, this Wavelength tunable laser is that single longitudinal mode exports;
One Polarization Controller, the input end of this Polarization Controller is connected with the output terminal of Wavelength tunable laser, exports polarisation of light state in order to adjusting wavelength tunable laser, reduces the Polarization Dependent Loss of light in transmitting procedure;
One phase-modulator, the light input end of this phase-modulator is connected with the output terminal of Polarization Controller, for carrying out phase-modulation to input optical signal;
One optical circulator, a end of this optical circulator is connected with the output terminal of phase-modulator;
One π phase shift bragg grating, one end of this π phase shift bragg grating is held with the b of optical circulator and is connected, for the specific modulation frequency in filtering modulated light signal;
One photodetector, the input end of this photodetector is held with the c of optical circulator and is connected;
One microwave power beam splitter, the input end of this microwave power beam splitter is connected with the output terminal of photodetector;
One microwave power amplifier, the input end of this microwave power amplifier is connected with the first output terminal of microwave power beam splitter, the output terminal of this microwave power amplifier is connected with the rf inputs of phase-modulator, in order to amplify photodetector beat frequency microwave signal power;
One frequency spectrograph, the input end of this frequency spectrograph is connected with the second output terminal of microwave power beam splitter.
2. the phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator according to claim 1, wherein Wavelength tunable laser is outside cavity gas laser, sampling grating semiconductor laser or fiber laser.
3. the phase shift optical fiber Bragg optical grating strain sensor-based system based on optical-electronic oscillator according to claim 1, wherein between tunable laser with Polarization Controller, between phase-modulator with Polarization Controller, between optical circulator with phase-modulator, π phase shift bragg grating is connected with standard single-mode fiber with between optical circulator, between photodetector with optical circulator, connects between all the other devices with standard radio frequency connecting line.
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| TWI500281B (en) * | 2014-02-27 | 2015-09-11 | Univ Nat Cheng Kung | Microwave power amplification apparatus and method thereof |
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| CN108240827A (en) * | 2018-02-09 | 2018-07-03 | 盐城工学院 | A kind of multi-parameter measurement method and device based on drawing cone polarization-maintaining fiber grating optical-electronic oscillator |
| CN108400516B (en) * | 2018-05-04 | 2019-11-22 | 北京交通大学 | A kind of optical-electronic oscillator stress sensing system based on Nonlinear Dispersive element |
| CN108981762A (en) * | 2018-06-19 | 2018-12-11 | 广东工业大学 | Thermostabilization sensing demodulating system and method are carried out using the double phase-shifted fiber gratings in narrowband |
| JP7383644B2 (en) * | 2018-07-04 | 2023-11-20 | アリエル サイエンティフィック イノベーションズ リミテッド | Method and system for determining perturbation of a grating by modulated light |
| CN109000687B (en) * | 2018-07-19 | 2021-01-01 | 西南交通大学 | Curvature demodulation device and method based on core-shift phase-shift fiber grating |
| CN111854980B (en) * | 2020-06-29 | 2021-05-18 | 华中科技大学 | Wavelength drift detection device and method based on asymmetric pi phase shift fiber grating |
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