CN105547336B - Fiber grating sensing demodulation apparatus and method based on optoelectronic oscillation loop - Google Patents
Fiber grating sensing demodulation apparatus and method based on optoelectronic oscillation loop Download PDFInfo
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- CN105547336B CN105547336B CN201510870825.3A CN201510870825A CN105547336B CN 105547336 B CN105547336 B CN 105547336B CN 201510870825 A CN201510870825 A CN 201510870825A CN 105547336 B CN105547336 B CN 105547336B
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- 238000005259 measurement Methods 0.000 claims description 10
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- 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
- G01D5/268—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 using optical fibres
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Abstract
The invention discloses the fiber grating sensing demodulation apparatus and method based on optoelectronic oscillation loop, including by electrooptic modulator, one or three port photocirculator, fiber amplifier, photodetector, radio frequency amplifier, radio-frequency filter and the port RF Power Splitters of 3dB tri- are sequentially connected the optoelectronic oscillation loop of composition, wideband light source is connected with the input port of the two or three port photocirculator, the output port of two or three port photocirculator is connected with the input port of electrooptic modulator, the second port of two or three port photocirculator is connected with a sensing bragg grating, the second port of one or three port photocirculator is connected with chirped fiber Bragg gratings, one output port of the port RF Power Splitters of 3dB tri- is connected with the electric drive port of electrooptic modulator, its another output port is connected with a rf frequency meter.The present invention is a kind of method of the new fiber grating sensing demodulation realized using microwave photon technology, suitable for the fiber grating demodulation application of low-cost and high-precision.
Description
Technical field
The present invention relates to microwave photon technology, photoelectron technology and optical fiber sensing technology, belong to using microwave photon technology
Carry out optical fiber grating sensing and the technical field of demodulation.
Background technology
Fiber-optic grating sensor have small volume, it is in light weight, be easily achieved remote and distributed measurement and anti-electromagnetism
The characteristics such as interference, therefore be widely used in the telemeasurement field of temperature, stress and refractive index.
Traditional fiber grating demodulation method is such as tunable F-P filter methods, non-frequently with optical filter demodulation method
Balance M-Z fibre optic interferometers method and grating matching method etc..These methods or higher, the cost to the performance requirement of optical filter
It is higher；Or more optical filter is needed, cost is higher and complicated, more difficult practical.Therefore, the quick solution of development
The method and low-cost equipment for recalling optic fiber grating wavelength variable quantity have great importance.
The content of the invention
It is an object of the invention to the deficiency for existing Optical Demodulation technology, and Bradley will be sensed using optoelectronic oscillation loop
Lattice fiber grating is converted into the frequency shift amount of radiofrequency signal with the extraneous wavelength variable quantity for sensing parameter, there is provided a kind of new
Fiber grating sensing demodulation method, so as to realize that the optic fiber grating wavelength of low-cost and high-precision demodulates, while provide realization and be somebody's turn to do
The device of method.
To achieve the above object, the present invention uses following technical scheme：
Fiber grating sensing demodulation device based on optoelectronic oscillation loop, including by electrooptic modulator, the one or three port optical
Circulator, fiber amplifier, photodetector, radio frequency amplifier, radio-frequency filter and the port RF Power Splitters of 3dB tri- are successively
Be connected the optoelectronic oscillation loop formed, and wideband light source is connected with the input port of the two or three port photocirculator, and the described 2nd 3
The output port of port photocirculator is connected with the input port of the electrooptic modulator, the two or three port photocirculator
Second port is connected with a sensing bragg grating, second port and the chirp cloth of the one or three port photocirculator
Glug fiber grating is connected, an output port of the port RF Power Splitters of 3dB tri- and the electric drive of the electrooptic modulator
Port is connected, and another output port of the port RF Power Splitters of 3dB tri- is connected with a rf frequency meter.
The method that fiber grating demodulation is carried out using the above-mentioned fiber grating sensing demodulation device based on optoelectronic oscillation loop,
Comprise the following steps：
1) light of the wideband light source transmitting reaches the sensing bragg fiber through the two or three port photocirculator
Grating, the light through sensing bragg grating reflection reach the electrooptic modulator through the two or three port photocirculator again, by
It is anti-that input port of the optical signal through the one or three port photocirculator of electrooptic modulator output reaches chirped fiber Bragg gratings
Penetrate, after the output port of the one or three port photocirculator reaches the fiber amplifier amplification, into the photodetection
Device carries out opto-electronic conversion, and obtained electric signal is by the amplification of radio frequency amplifier, the filtering of radio-frequency filter, through the ports of 3dB tri-
RF Power Splitter reaches the electric drive port of electrooptic modulator, carries out electro-optic conversion by electrooptic modulator, and so on forms light
Electric oscillation loop, the radiofrequency signal output of certain frequency is obtained in the output port of the port RF Power Splitters of 3dB tri-, its frequency is
F=kc/nL (1)
Wherein n is optical fibre refractivity, and c is the light velocity in vacuum, and L is optoelectronic oscillation loop-length, and k is integer, k value sizes
Determined by radio-frequency filter frequency size, output radio frequency signal frequency is determined by radio-frequency filter frequency；Radio-frequency filter bandwidth
On the one hand it is less than the free spectral range f=c/nL of vibration harmonic wave, on the other hand determines the measurement of the sensing demodulating system
Scope；
2) when external world's sensing parameter change, the reflection spike of bragg grating is sensed described in optoelectronic oscillation loop
Length can change therewith, and its knots modification is Δ λ, then its corresponding reflection position meeting in the chirped fiber Bragg gratings
Changing, its variable quantity can be expressed as Δ z=Δ λ/D, and wherein D is the chirp rate of chirped fiber Bragg gratings, now,
Output radio frequency signal frequency, which becomes, to be turned to
F'=kc/n (L+ Δs z) (2)
3) using rf frequency meter measurement output signal frequency, then light can be obtained in Chirp Bragg according to (1) (2) two formula
The changes delta z of fiber grating reflection position, then obtain sensing the wavelength variable quantity of bragg grating by Δ λ=Δ z/D,
So as to be demodulated to sensing parameter.
After adopting the above technical scheme, the present invention has the following advantages that compared with background technology：
Present invention utilizes optoelectronic oscillation frequency loop characteristic and the dispersion characteristics of chirped fiber grating, by measurement due to
Optoelectronic oscillation loop output radio frequency signal frequency knots modification caused by the change of Prague optic fiber grating wavelength is sensed, to carry out Bradley
Lattice optical fiber grating sensing and demodulation, the present invention possess with roomy, anti-electromagnetic interference, are suitable to relative to other traditional measurement schemes
The outstanding advantages such as high accuracy, low cost and miniaturization, greatly reduce the cost and complexity of measurement.The present invention is a kind of new
Using microwave photon technology realize sensing and demodulating Bragg fiber grating method, be very suitable for low-cost and high-precision sensing
Demodulation.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
For embodiment as shown in figure 1, a kind of fiber grating sensing demodulation device based on optoelectronic oscillation loop, it includes broadband
Light source 1, the two or three port photocirculator 2, sensing bragg grating 3, electrooptic modulator 4, the one or three port photocirculator
5th, chirped fiber Bragg gratings 6, fiber amplifier 7, photodetector 8, radio frequency amplifier 9, radio-frequency filter 10,3dB tri-
Port RF Power Splitter 11 and rf frequency meter 12.
The connection of above all parts is as follows, and wideband light source 1 is connected with the input port of the two or three port photocirculator 2
Connect, the output port of the two or three port photocirculator 2 and the input port light connects of electrooptic modulator 4, the two or the three port ring of light
The second port of row device 2 is connected with sensing one end of bragg grating 3, the output port of electrooptic modulator 4 and first
The input port light connects of three port photocirculators 5, output port and the fiber amplifier 7 of the one or three port photocirculator 5
Input port is connected, and the second port of the one or three port photocirculator 5 is connected with chirped fiber Bragg gratings 6, optical fiber
The output port of amplifier 7 and the input port light connects of photodetector 8, output port and the radio frequency of photodetector 8 are put
The input port electrical connection of big device 9, the output port of radio frequency amplifier 9 are connected with the input port of radio-frequency filter 10, penetrated
The output port of frequency wave filter 10 is connected with the input port of the port RF Power Splitters 11 of 3dB tri-, the port radio frequency work(point of 3dB tri-
One output port of device 11 is connected with the electric drive port of electrooptic modulator 4, and the port RF Power Splitters 11 of 3dB tri- are in addition
One output port is connected with rf frequency meter 12.Electrooptic modulator 4, the one or three port photocirculator being wherein sequentially connected
5th, fiber amplifier 7, photodetector 8, radio frequency amplifier 9, radio-frequency filter 10 and the structure of tri- port RF Power Splitters of 3dB 11
Into optoelectronic oscillation loop.
Comprised the following steps using above-mentioned fiber grating sensing demodulation device to carry out the method for sensing and demodulating：
1) light that wideband light source 1 is launched reaches sensing bragg grating 3 through the two or three port photocirculator 2, and passes through
Sensing bragg grating 3 reflects, then reaches electrooptic modulator 4 by the two or three port photocirculator 2, by electrooptic modulator 4
The optical signal of output is reached after chirped fiber Bragg gratings 6 reflect through the input port of the one or three port photocirculator 5, through the
The output port of one or three port photocirculators 5 reaches fiber amplifier 7 and amplified, and carries out opto-electronic conversion into photodetector 8, obtains
The electric signal arrived is arrived by the amplification of radio frequency amplifier 9, the filtering of radio-frequency filter 10 through the port RF Power Splitters 11 of 3dB tri-
Up to the electric drive port of electrooptic modulator 4, electro-optic conversion is carried out by electrooptic modulator 4, and so on forms optoelectronic oscillation loop,
The radiofrequency signal output of certain frequency is obtained in the output port of the port RF Power Splitters 11 of 3dB tri-, its frequency is
F=kc/nL (1)
Wherein n is optical fibre refractivity, and c is the light velocity in vacuum, and L is optoelectronic oscillation loop-length, and k is integer.K value sizes
Determined by the frequency size of radio-frequency filter 10, while export radio frequency signal frequency and determined by the frequency of radio-frequency filter 10；Radio frequency is filtered
On the one hand the bandwidth of ripple device 10 is less than the free spectral range f=c/nL of vibration harmonic wave, on the other hand it determines the sensing
The measurement range of demodulating system.
2) when external world's sensing parameter change, the reflection peak wavelength of bragg grating 3 is sensed in optoelectronic oscillation loop
It can change therewith, its knots modification is Δ λ, then its corresponding reflection position in chirped fiber Bragg gratings 6 can occur
Change, its variable quantity can be expressed as Δ z=Δ λ/D, and wherein D is the chirp rate of chirped fiber Bragg gratings 6.Now, it is defeated
Go out radio frequency signal frequency change to turn to
F'=kc/n (L+ Δs z) (2)
3) using the measurement output radio frequency signal frequency of rf frequency meter 12, then light can be obtained in chirp according to (1) (2) two formula
The changes delta z of the reflection position of bragg grating 6, then obtain sensing the ripple of bragg grating 3 by Δ λ=Δ z/D
Long variable quantity, so as to be demodulated to sensing parameter.
Present invention employs optoelectronic oscillation loop, the light that sensing bragg grating 3 is reflected shakes as photoelectricity
The light source of loop is swung, and sets chirped fiber Bragg gratings 6 to provide time delay in optoelectronic oscillation loop, when the external world senses parameter
During change, cause the change of the reflection wavelength of sensing bragg grating 3, so that the optical signal is in Chirp Bragg light
Reflection position change in fine grating 6.The sensing reflection wavelength of bragg grating 3 is located at chirped fiber Bragg gratings 6
In broadband reflection band.Therefore the light path of optoelectronic oscillation loop can change, so as to cause the radio frequency of optoelectronic oscillation loop to export
The change of signal frequency.Output radio frequency signal frequency is measured by rf frequency meter 11 to change, and obtains sensing bragg fiber light
The changed wavelength of grid, so as to realize the demodulation to sensing parameter.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art the invention discloses technical scope in, the change or replacement that can readily occur in,
It should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with scope of the claims
It is defined.
Claims (1)
1. the method that the fiber grating sensing demodulation device based on optoelectronic oscillation loop carries out fiber grating demodulation, its feature exist
In：
The Fibre Optical Sensor demodulating equipment includes being visited by electrooptic modulator, the one or three port photocirculator, fiber amplifier, photoelectricity
The optoelectronic oscillation loop that device, radio frequency amplifier, radio-frequency filter and the port RF Power Splitters of 3dB tri- are sequentially connected composition is surveyed,
Wideband light source is connected with the input port of the two or three port photocirculator, the output port of the two or three port photocirculator with
The input port of the electrooptic modulator is connected, the second port of the two or three port photocirculator and sensing Prague light
Fine grating is connected, and the second port of the one or three port photocirculator is connected with a chirped fiber Bragg gratings, the 3dB
One output port of three port RF Power Splitters is connected with the electric drive port of the electrooptic modulator, and the ports of 3dB tri- are penetrated
Another output port of frequency power splitter is connected with a rf frequency meter；
It the described method comprises the following steps
1) light of the wideband light source transmitting reaches the sensing bragg grating through the two or three port photocirculator,
Light through sensing bragg grating reflection reaches the electrooptic modulator through the two or three port photocirculator again, is adjusted by electric light
Input port of the optical signal through the one or three port photocirculator of device output processed reaches chirped fiber Bragg gratings reflection, through this
After the output port of one or three port photocirculator reaches the fiber amplifier amplification, light is carried out into the photodetector
Electricity conversion, obtained electric signal is by the amplification of radio frequency amplifier, the filtering of radio-frequency filter, through the port radio frequency work(point of 3dB tri-
Device reaches the electric drive port of electrooptic modulator, and electro-optic conversion is carried out by electrooptic modulator, and so on forms optoelectronic oscillation ring
Road, the radiofrequency signal output of certain frequency is obtained in the output port of the port RF Power Splitters of 3dB tri-, its frequency is
F=kc/nL (1)
Wherein n is optical fibre refractivity, and c is the light velocity in vacuum, and L is optoelectronic oscillation loop-length, and k is integer, and k value sizes are by penetrating
Frequency filter frequencies size determines, while exports radio frequency signal frequency and determined by radio-frequency filter frequency；Radio-frequency filter bandwidth
On the one hand it is less than the free spectral range f=c/nL of vibration harmonic wave, on the other hand determines the measurement of the sensing demodulating system
Scope；
2) when external world's sensing parameter change, the reflection peak wavelength meeting of bragg grating is sensed described in optoelectronic oscillation loop
Change therewith, its knots modification is Δ λ, then its corresponding reflection position in the chirped fiber Bragg gratings can occur
Change, its variable quantity can be expressed as Δ z=Δ λ/D, and wherein D is the chirp rate of chirped fiber Bragg gratings, now, output
Radio frequency signal frequency, which becomes, to be turned to
F'=kc/n (L+ Δs z) (2)
3) using rf frequency meter measurement output signal frequency, then light can be obtained in Chirp Bragg optical fiber according to (1) (2) two formula
The changes delta z of optical grating reflection position, then obtain sensing the wavelength variable quantity of bragg grating by Δ λ=Δ z/D, so as to
Sensing parameter is demodulated.
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| 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 |
| CN108955939B (en) * | 2018-07-19 | 2020-09-25 | 南京航空航天大学 | Fiber grating temperature sensing demodulation system |
| CN108879295B (en) * | 2018-08-06 | 2020-09-01 | 北京无线电计量测试研究所 | High-stability photoelectric oscillator and control method |
| CN109520533A (en) * | 2019-01-23 | 2019-03-26 | 国网江西省电力有限公司信息通信分公司 | Fiber grating demodulation device and method based on fiber optic loop microwave photon filter |
| CN112683313A (en) * | 2020-12-15 | 2021-04-20 | 南京信息职业技术学院 | Sensor array device of multi-photoelectric oscillator and measuring method |
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