CN110307862A - A kind of fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth - Google Patents
A kind of fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth Download PDFInfo
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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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
- G01J3/433—Modulation spectrometry; Derivative spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0878—Sensors; antennas; probes; detectors
- G01R29/0885—Sensors; antennas; probes; detectors using optical probes, e.g. electro-optical, luminiscent, glow discharge, or optical interferometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/0864—Measuring electromagnetic field characteristics characterised by constructional or functional features
- G01R29/0892—Details related to signal analysis or treatment; presenting results, e.g. displays; measuring specific signal features other than field strength, e.g. polarisation, field modes, phase, envelope, maximum value
Abstract
The invention discloses a kind of fiber grating beat frequency demodulating systems based on the detection of radiofrequency signal bandwidth, it includes laser pumping source, wavelength division multiplexer, static grating, amplifier, sensing grating, photodetector, Spectrum Analyzer, the laser that laser pumping source issues successively passes through wavelength division multiplexer, static grating, amplifier and sensing grating, static grating, amplifier and sensing grating form resonant cavity, in resonant cavity, the laser reflected simultaneously by static grating and sensing grating is by lasing, by the laser light incident of lasing to wavelength division multiplexer, and photodetector is injected by wavelength division multiplexer, beat frequency forms beat signal to the laser of different longitudinal mode frequencies two-by-two on photodetector；Beat signal is analyzed by the way that the physical parameter on sensing grating to be modulated in beat signal with certain linear relationship, and by Spectrum Analyzer, the size of the physical parameter on sensing grating can be obtained.This method has higher sensitivity, resolution ratio.
Description
Technical field
The present invention relates to grating sensing demodulation system technical field, in particular to it is a kind of based on radiofrequency signal bandwidth detection
Fiber grating beat frequency demodulating system.
Background technique
Optical fiber is the optical fiber made of glass and plastics, and according to the total reflection principle of light, optical fiber is as a kind of light
Conduction tool, is used for optical communication field earliest；With the development of Fiber Bragg Grating technology, optical fiber technology cannot be only used for light wave letter
Number propagation, while can by the change modulates of extraneous physical parameter into optical fiber lightwave signal characteristic parameter (such as amplitude, phase,
Frequency etc.) variation in, so as to associated fiber device be monitored as sensor the variation of various physical quantitys.
Research by many years domestic and foreign scholars to sensory field of optic fibre, optical fiber sensing technology have tended to be mature；With tradition
Sensor is compared, and simple, small in size, light-weight, low energy consumption, corrosion-resistant, electromagnetism interference, electricity are exhausted with its structure for fibre optical sensor
The advantages that edge performance is good, convenient for being multiplexed is widely used in the neck such as petrochemical industry, aerospace, navigation, intelligence structure monitoring, medical treatment
Domain.
Traditional fiber grating class sensor is usually that wavelength modulate typed sensor (converts spectrum for the variation of physical quantity
The variation of wavelength in signal), the optical device of a set of valuableness is needed when acquiring spectral signal, real-time dynamic demodulation is difficult.Together
When, sensitivity and resolution ratio have been unable to meet demand.
Summary of the invention
In view of the deficiencies of the prior art, it is an object of that present invention to provide one kind have higher sensitivity, resolution ratio and
The more convenient fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth measured and calculated.It uses following technical side
Case:
A kind of fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth comprising laser pumping source, wavelength-division
Multiplexer, static grating, amplifier, sensing grating, photodetector, Spectrum Analyzer, the laser pumping source issue
Laser static grating, amplifier and sensing grating are entered by the wavelength division multiplexer, the static state grating, amplifier and biography
Photosensitive grid form resonant cavity, and in the resonant cavity, while the laser reflected by the static grating and sensing grating is by lasing,
The photodetector is injected by the laser light incident of lasing to the wavelength division multiplexer, and by the wavelength division multiplexer, difference is vertical
Beat frequency forms beat signal to the laser of mould frequency two-by-two on the photodetector；
By the spectral band that the physical parameter on the sensing grating is modulated to beat signal with certain linear relationship
In width, and the beat signal is analyzed by the Spectrum Analyzer, the physics ginseng on the sensing grating can be obtained
The size of amount.
It as a further improvement of the present invention, further include fixed station, fixed column and translation column, the fixed column and fixed station
It is fixedly connected, the translation column is slidably connected with fixed station, and one end of the sensing grating is connect with fixed column, the other end and flat
Column connection is moved, when the physical parameter variation on the sensing grating, the translation column translation, to adjust the resonant cavity
Length.
As a further improvement of the present invention, the fixed station be equipped with sliding slot, the translation column bottom equipped with it is described
The sliding block of sliding slot cooperation.
As a further improvement of the present invention, it when physical parameter extraneous on sensing grating does not change, is located at described
The zlasing mode minimal wave length excited in resonant cavity is a, then corresponding frequency are as follows:
Wherein c is the speed that light is propagated in a vacuum, εrFor the dielectric constant of optical fiber；If the zlasing mode of intracavitary excitation is most
Big wavelength is b, corresponding frequency are as follows:
At this point, the bandwidth of the beat signal generated by the two mode are as follows: B=fh-fl；
When physical parameter extraneous on sensing grating changes, reflectance spectrum is drifted about therewith, if d is sense light
The drift value of grid central wavelength, then the zlasing mode maximum wavelength of corresponding excitation is then b-d, frequency are as follows:
At this point, the minimal wave length of the zlasing mode of excitation is still a, corresponding frequency is still fh, the beat signal of generation is
Are as follows: B=fh-fl'；
The variable quantity of beat signal bandwidth is then are as follows:
It as a further improvement of the present invention, further include spectrophotometric unit and spectrometer, the laser light incident reflected is to described
After wavelength division multiplexer, it is incident to the spectrophotometric unit, the photodetector and spectrum are incident to by the spectrophotometric unit respectively
Instrument.
As a further improvement of the present invention, the spectrophotometric unit is the 1*2 fiber coupler that splitting ratio is 50::50.
As a further improvement of the present invention, the amplifier is Er-doped fiber.
As a further improvement of the present invention, the laser pumping source is 980nm laser pumping source.
As a further improvement of the present invention, the physical parameter includes temperature, stress.
Beneficial effects of the present invention:
The fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth of the invention is by will be on sensing grating
Physical parameter is modulated in the spectral bandwidth of beat signal with certain linear relationship, and is analyzed and clapped by Spectrum Analyzer
The size of the physical parameter on sensing grating can be obtained in frequency signal, should compared with the method for conventional detection beat signal frequency displacement
Method has higher sensitivity, resolution ratio and is more convenient to measure and calculate.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the signal of the fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth in the embodiment of the present invention
Figure；
Fig. 2 is the schematic diagram that resonant cavity generates beat signal in the embodiment of the present invention；
Fig. 3 is the beat signal figure not applied to sensing grating when straining in the embodiment of the present invention；
Fig. 4 is to apply beat signal figure when straining to sensing grating in the embodiment of the present invention；
Fig. 5 is the measurement result analysis chart of sensing grating in the embodiment of the present invention.
Description of symbols: 10, fixed station；20, fixed column；30, column is translated.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings and specific examples, so that those skilled in the art can be with
It more fully understands the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
As shown in Figure 1, demodulating system for the fiber grating beat frequency based on the detection of radiofrequency signal bandwidth in the embodiment of the present invention
System, the fiber grating beat frequency demodulating system that should be detected based on radiofrequency signal bandwidth includes laser pumping source, wavelength division multiplexer, static state
Grating (FBG), amplifier, sensing grating (FBG), photodetector, Spectrum Analyzer.In the present embodiment, amplifier
For Er-doped fiber.
The laser that laser pumping source issues enters static grating (FBG), amplifier and sensing grating by wavelength division multiplexer
(FBG), static grating (FBG), amplifier and sensing grating (FBG) form resonant cavity, in resonant cavity, while by static grating
(FBG) and the laser of sensing grating (FBG) reflection is by lasing, answers by the laser light incident of lasing to wavelength division multiplexer, and by wavelength-division
Photodetector is injected with device, beat frequency forms beat signal to the laser of different longitudinal mode frequencies two-by-two on photodetector.
By the spectral band that the physical parameter on sensing grating (FBG) is modulated to beat signal with certain linear relationship
In width, and beat signal is analyzed by Spectrum Analyzer, the big of the physical parameter on sensing grating (FBG) can be obtained
It is small.Wherein, physical parameter includes temperature, stress etc..
In the present embodiment, which further includes fixed station 10, fixed column 20 and translation column 30, fixed column 20 and fixed station
10 are fixedly connected, and translation column 30 is slidably connected with fixed station 10, and one end of sensing grating (FBG) is connect with fixed column 20, another
End is connect with translation column 30, and when the physical parameter variation on sensing grating (FBG), translation column 30 is translated, to adjust resonance
The length of chamber.Preferably, fixed station 10 is equipped with sliding slot, and translation 30 bottom of column is equipped with the sliding block cooperated with sliding slot.
Preferably, which further includes spectrophotometric unit and spectrometer, after the laser light incident to wavelength division multiplexer reflected, is entered
It is incident upon spectrophotometric unit, photodetector and spectrometer are incident to by spectrophotometric unit respectively.In the present embodiment, spectrophotometric unit is point
Light ratio is the 1*2 fiber coupler of 50::50.Spectrometer is for being observed optical signal.
As shown in Fig. 2, being located in the resonant cavity when physical parameter extraneous on sensing grating (FBG) does not change
The zlasing mode minimal wave length of excitation is a, then corresponding frequency are as follows:
Wherein c is the speed that light is propagated in a vacuum, εrFor the dielectric constant of optical fiber；If the zlasing mode of intracavitary excitation is most
Big wavelength is b, corresponding frequency are as follows:
At this point, the bandwidth of the beat signal generated by the two mode are as follows: B=fh-fl；
When physical parameter extraneous on sensing grating (FBG) changes, reflectance spectrum is drifted about therewith, if d is
The drift value of sensing grating (FBG) central wavelength, then the zlasing mode maximum wavelength of corresponding excitation is then b-d, frequency are as follows:
At this point, the minimal wave length of the zlasing mode of excitation is still a, corresponding frequency is still fh, the beat signal of generation is
Are as follows: B=fh-fl'；
The variable quantity of beat signal bandwidth is then are as follows:
When physical parameter variation extraneous on sensing grating (FBG), as the translation of sensing grating (FBG) reflectance spectrum is clapped
The bandwidth of frequency signal will reduce therewith；According to linear between the bandwidth of beat signal and sensing grating (FBG) central wavelength
Relationship, by the change modulates of the additional physical parameter sensed on sensing grating (FBG) into the variation of beat signal bandwidth, and
It can be monitored in real time by Spectrum Analyzer.
In the present embodiment, laser pumping source is 980nm laser pumping source, and the length of Er-doped fiber is 8.0m in resonant cavity
And the absorption coefficient at 1532.0nm is 6.1dB/m；The reflection bandwidth of static grating be 0.24nm reflectivity be 90.0% and
For central wavelength at 1550.21nm, the reflection bandwidth of sensing grating is that 0.25nm reflectivity is 89.7% and central wavelength exists
1550.43nm place.
As shown in figure 3, for the beat signal measured when sensing grating is not applied and strained using Spectrum Analyzer,
As Fig. 3 (a) can be seen that measure do not apply strain when beat signal bandwidth be 7.0GHz；And 1.00GHz to 1.05GHz frequency range
Include the beat signal of both of which shown in beat signal such as Fig. 3 (b), in the frequency range: long longitudinal-mode beat frequencies signal and polarization mode are clapped
Frequency signal is divided into 10.1MHz between can measuring between two long longitudinal-mode beat frequencies signals, according to the theory analysis pair of beat signal
Answer a length of 11.98m of entire chamber.
As shown in figure 4, to apply the beat signal that the strain of 60 μ ε and 100 μ ε obtains respectively to sensing grating, by Fig. 4
(a) bandwidth that can be seen that the beat signal when applying 60 μ ε strain is 4.0GHz compared to reducing 3.0GHz when not applying strain
The beat signal of bandwidth；Can be seen that from Fig. 4 (b) when apply 100 μ ε strain when beat signal bandwidth be 2.0GHz compared to
The beat signal for reducing 5.0GHz bandwidth when strain is not applied；It can thus be seen that the bandwidth of beat signal is with application stress
Increase and is gradually reduced.
In order to further inquire into the bandwidth of beat signal and apply the transformation relation between strain, to sense light in experiment
Grid apply the strain of from 0 to 140 μ ε with the step-length of 20 μ ε respectively while recording the transformation of beat signal bandwidth and to the reality measured
It tests data and has carried out linear fit, shown in experimental result such as Fig. 5 (a)；According to being fitted the linear pass obtained to experimental data
It is that the bandwidth for measuring beat signal to every group can see shown in analysis and calculated result such as Fig. 5 (b) of experimental error
Out, for average worst error within ± 0.94 μ ε, measurement maximum strain is ± 140.0 μ ε, can obtain the demodulation accuracy of the system
About 0.6%.
The fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth of the invention is by will be on sensing grating
Physical parameter is modulated in the spectral bandwidth of beat signal with certain linear relationship, and is analyzed and clapped by Spectrum Analyzer
The size of the physical parameter on sensing grating can be obtained in frequency signal, should compared with the method for conventional detection beat signal frequency displacement
Method has higher sensitivity, resolution ratio and is more convenient to measure and calculate.
Above embodiments are only to absolutely prove preferred embodiment that is of the invention and being lifted, and protection scope of the present invention is not
It is limited to this.Those skilled in the art's made equivalent substitute or transformation on the basis of the present invention, in guarantor of the invention
Within the scope of shield.Protection scope of the present invention is subject to claims.
Claims (9)
1. a kind of fiber grating beat frequency demodulating system based on the detection of radiofrequency signal bandwidth, which is characterized in that including laser pump (ing)
Source, wavelength division multiplexer, static grating, amplifier, sensing grating, photodetector, Spectrum Analyzer, the laser pump (ing)
The laser that source issues enters static grating, amplifier and sensing grating, the static state grating, amplification by the wavelength division multiplexer
Device and sensing grating form resonant cavity, in the resonant cavity, while the laser reflected by the static grating and sensing grating
By lasing, the photodetector is injected by the laser light incident of lasing to the wavelength division multiplexer, and by the wavelength division multiplexer,
Beat frequency forms beat signal to the laser of different longitudinal mode frequencies two-by-two on the photodetector；
By the way that the physical parameter on the sensing grating is modulated in the spectral bandwidth of beat signal with certain linear relationship,
And the beat signal is analyzed by the Spectrum Analyzer, the big of the physical parameter on the sensing grating can be obtained
It is small.
2. the fiber grating beat frequency demodulating system as described in claim 1 based on the detection of radiofrequency signal bandwidth, which is characterized in that
It further include that fixed station, fixed column and translation column, the fixed column are fixedly connected with fixed station, the translation column and fixed station slide
Connection, one end of the sensing grating are connect with fixed column, and the other end is connect with translation column, the physics on the sensing grating
When parameter changes, the translation column translation, to adjust the length of the resonant cavity.
3. the fiber grating beat frequency demodulating system as claimed in claim 2 based on the detection of radiofrequency signal bandwidth, which is characterized in that
The fixed station is equipped with sliding slot, and the translation column bottom is equipped with the sliding block cooperated with the sliding slot.
4. the fiber grating beat frequency demodulating system as described in claim 1 based on the detection of radiofrequency signal bandwidth, which is characterized in that
When physical parameter extraneous on sensing grating does not change, being located at the zlasing mode minimal wave length excited in the resonant cavity is
A, then corresponding frequency are as follows:
Wherein c is the speed that light is propagated in a vacuum, εrFor the dielectric constant of optical fiber；If the zlasing mode maximum wave of intracavitary excitation
A length of b, corresponding frequency are as follows:
At this point, the bandwidth of the beat signal generated by the two mode are as follows: B=fh-fl；
When physical parameter extraneous on sensing grating changes, reflectance spectrum is drifted about therewith, if d is in sensing grating
The long drift value of cardiac wave, then the zlasing mode maximum wavelength of corresponding excitation is then b-d, frequency are as follows:
At this point, the minimal wave length of the zlasing mode of excitation is still a, corresponding frequency is still fh, the beat signal of generation is are as follows: B=
fh-fl'；
The variable quantity of beat signal bandwidth is then are as follows:
5. the fiber grating beat frequency demodulating system as described in claim 1 based on the detection of radiofrequency signal bandwidth, which is characterized in that
Further include spectrophotometric unit and spectrometer, after the laser light incident reflected to the wavelength division multiplexer, be incident to the spectrophotometric unit,
The photodetector and spectrometer are incident to by the spectrophotometric unit respectively.
6. the fiber grating beat frequency demodulating system as claimed in claim 5 based on the detection of radiofrequency signal bandwidth, which is characterized in that
The spectrophotometric unit is the 1*2 fiber coupler that splitting ratio is 50::50.
7. the fiber grating beat frequency demodulating system as described in claim 1 based on the detection of radiofrequency signal bandwidth, which is characterized in that
The amplifier is Er-doped fiber.
8. the fiber grating beat frequency demodulating system as described in claim 1 based on the detection of radiofrequency signal bandwidth, which is characterized in that
The laser pumping source is 980nm laser pumping source.
9. the fiber grating beat frequency demodulating system as described in claim 1 based on the detection of radiofrequency signal bandwidth, which is characterized in that
The physical parameter includes temperature, stress.
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Cited By (2)
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| CN113483912A (en) * | 2021-07-05 | 2021-10-08 | 江南大学 | Biological temperature detection system and method based on optical fiber beat frequency technology |
| CN114252141A (en) * | 2021-12-13 | 2022-03-29 | 江南大学 | Double-parameter detection digital sensing system and method based on optical fiber beat frequency technology |
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| CN114252141B (en) * | 2021-12-13 | 2022-12-13 | 江南大学 | Double-parameter detection digital sensing system and method based on optical fiber beat frequency technology |
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