CN106091973A - Based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain detecting method - Google Patents
Based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain detecting method Download PDFInfo
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- CN106091973A CN106091973A CN201610518516.4A CN201610518516A CN106091973A CN 106091973 A CN106091973 A CN 106091973A CN 201610518516 A CN201610518516 A CN 201610518516A CN 106091973 A CN106091973 A CN 106091973A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/16—Measuring arrangements characterised by the use of optical techniques for measuring the deformation in a solid, e.g. optical strain gauge
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Abstract
The invention provides a kind of based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain measurement method.The continuous light that ASE light source sends becomes pulsed light after the light polarizer, electrooptic modulator；Pulsed light declines in annular and swings intracavity repeatedly loop attenuation, and in each circulation, only fraction flashlight is exported by the first outfan of the second bonder, and is detected by photodetector, and remainder continues to decay in annular chamber.When sensor fibre grating produces strain, sensor fibre grating changes with the relative position of auxiliary optical fiber grating spectrum, cause annular to decline and swing the Dissipation change in chamber, and then cause the ring-down time of pulse signal to change, the strain of sensor fibre grating therefore can be obtained by the ring-down time of direct impulse signal.Owing to sensor fibre grating is identical with the temperature-responsive of auxiliary fiber grating, variations in temperature will not change annular and decline the ring-down time of the loss swinging chamber and light pulse signal, and therefore this sensor can realize temperature self-compensation.
Description
Technical field
The present invention relates to strain sensing technology, particularly relate to a kind of based on annular Research on Cavity Ring Down Spectroscopy strain transducer.
Background technology
Fiber Bragg grating strain sensor, using laser as the carrier of strain information, utilizes fiber-optic transfer laser, therefore, with biography
Strain transducer based on the signal of telecommunication of system is compared, have electric insulation, electromagnetism interference, volume little, lightweight, can multichannel multiple
With, can on-the-spot real-time telemetry and the plurality of advantages such as range of dynamic measurement is wide, therefore, be now widely used for civil engineering structure,
The industries such as aerospace, boats and ships shipping business, power industry, petrochemical industry, medical science, nuclear industry, especially at high voltage, strong
Electromagnetic field, inflammable and explosive adverse circumstances has the strongest application advantage.
Fiber grating not only strain sensitive, simultaneously to temperature also quite sensitive, measures strain hence with fiber grating
The impact of ambient temperature must be eliminated during signal.Additionally, 1 microstrain can only cause the wavelength change of fiber grating about 1pm, carry
The strain sensitivity of high fiber grating needs by high-sensitive demodulation method.
Fiber annular cavity ring-down spectroscopy technology is a kind of optical signal demodulation method, has highly sensitive, not by light source intensity
The advantages such as influence of fluctuations, capacity of resisting disturbance are strong, attract wide attention, one of technical way becoming trace detection.
Article 1(Daqing Tang, Dexing Yang, Yajun Jiang, Jianlin Zhao, Haiyan
Wang, Shiquan Jiang, “Fiber loop ring-down optical fiber grating gas pressure
sensor,”Optics and Lasers in Engineering, 2010,48:1262 1265.) disclose a kind of based on
Fiber annular cavity ring-down spectroscopy technology and the pressure transducer of single fiber grating, although this sensor can improve optical fiber in theory
The measurement sensitivity of grating, but owing to the impact of ambient temperature cannot be compensated, therefore can be only applied under constant temperature；Article
2(N. Ni, C. C. Chan, X. Y. Dong, J. Sunand P Shum, " Cavity ring-down long-
period fibregrating strain sensor,”Measurement Science and Technology, 2007,
18:3135 3138.) disclose a kind of based on fiber annular cavity ring-down spectroscopy technology, long-period gratings and the strain of fiber grating
Sensor, owing to long-period gratings is different with the response of fiber grating pair temperature, therefore, this strain transducer cannot compensate equally
The impact of temperature.
Summary of the invention
The brief overview about the present invention given below, in order to provide about certain aspects of the invention is basic
Understand.Should be appreciated that this general introduction is not that the exhaustive about the present invention is summarized.It is not intended to determine the pass of the present invention
Key or pith, nor is it intended to limit the scope of the present invention.Its purpose is only to provide some concept in simplified form,
In this, as the preamble in greater detail discussed after a while.
In consideration of it, the invention provides a kind of based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain detecting side
Method, at least to solve existing strain transducer based on fiber annular cavity ring-down spectroscopy technology and fiber grating by temperature interference
Problem.
According to an aspect of the invention, it is provided one is based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain
Detection method, should include ASE light source, the polarizer, electrooptic modulator, waveform based on annular Research on Cavity Ring Down Spectroscopy strain transducer
Generator, annular decline and swing chamber, photodetector and oscillograph；Wherein, annular decline swing chamber by the first bonder, first annular device,
Sensor fibre grating, EDFA amplifier, the second bonder, the second circulator, auxiliary fiber grating and time delay optical fiber are constituted; ASE
The continuous light that light source sends becomes pulsed light through the polarizer, and this pulsed light declines in annular and swings cavity circulation decay, the arteries and veins after decay
Pulsed light signal is by the second outfan output of the second bonder, and subsequently into photodetector, photodetector will receive
Declining and swing pulsed optical signals and be converted into the signal of telecommunication, this signal of telecommunication is exported by oscillograph.
Further, the outfan of the first bonder is connected with the input of first annular device, the input of first annular device
Outfan is connected with sensor fibre grating, and the outfan of first annular device is connected with the input of EDFA amplifier, and EDFA amplifies
The outfan of device and the input of the second bonder connect, and the first outfan of the second bonder is connected with photodetector, the
Second outfan of two bonders and the input of the second circulator connect, the input/output terminal of the second circulator and auxiliary optical fiber
Grating connects, and the outfan of the second circulator is connected with the input of time delay optical fiber, the outfan of time delay optical fiber and described first
Second input of bonder connects.
Further, the reflectance spectrum of sensor fibre grating and auxiliary fiber grating is all approximately Gaussian, sensor fibre light
The 3dB spectrum width of grid is less than the half of the 3dB spectrum width of auxiliary fiber grating, and the centre wavelength of sensor fibre grating is positioned at fill-in light
On the slope of the reflectance spectrum of fine grating；Sensor fibre grating is the most sensitive to tested strain and ambient temperature, assists fiber grating
Sensitive and insensitive to tested strain to ambient temperature, and sensor fibre grating and the response of auxiliary fiber grating pair ambient temperature
Identical.
Further, ASE light source is wide spectrum light source, and the light intensity of output spectrum is identical in service band.
Further, the continuous light that ASE light source sends becomes pulsed light after the polarizer and electrooptic modulator, this pulse
Light is entered annular by the first input end of the first bonder and declines and swing chamber, and declines in annular and swing intracavity and often circulate one week and have same light
The partial pulse light of strong ratio, by the first outfan output of the second bonder, receives subsequently into photodetector.
Further, waveform generator provides pulse-modulated signal for electrooptic modulator.
Further, the first input end of described first bonder and the splitting ratio of the second input are 1:99, described
First outfan of two bonders and the splitting ratio of the second outfan are 1:99.
Further, pulsed light declines in annular and swings 2-10 times that time is pulsed light width needed for cavity circulation one week,
1/50-1/20 for the pulsed light cycle.
Further, the service band of ASE light source is 1530nm-1570nm.
According to a further aspect in the invention, additionally provide a kind of based on annular Research on Cavity Ring Down Spectroscopy strain transducer should
Becoming detection method, this detection method is:
Step one: waveform generator provides pulse signal to electrooptic modulator, make continuous light that ASE light source sends through the polarizer and
Become pulsed light after electrooptic modulator, by controlling the pulsewidth of this pulsed light and cycle and the length of time delay optical fiber, make pulse
Light declines in annular and swings the time needed for cavity circulation one weekt r 2-10 times, the 1/50-1/ in pulsed light cycle for pulsed light pulsewidth
20；
Step 2: declined by the gain-adjusted annular of regulation EDFA amplifier and swing the loop loss in chamber, is made oscillograph output decline and swings
Pulse voltage signal, then fix the gain of EDFA amplifier, it is ensured that during strain measurement this gain keep constant；
Step 3: according to the sideband slope of auxiliary optical fiber optical grating reflection spectrumk, the elasto-optical coefficient of sensor fibre gratingP e , light arteries and veins
Rush signal annular decline swing in chamber transmit one circle used by timet r Decline in annular with pulsed light and swing intracavity ring-down timeτChange
Change amountdτObtain the strain variation amount of sensor fibre gratingd ε 。
The present invention based on annular Research on Cavity Ring Down Spectroscopy strain transducer, swing chamber by being declined in annular by two fiber gratings
The mode of interior cascade solves the temperature interference problem to sensor fibre grating, owing to have employed fiber annular cavity ring-down spectroscopy skill
This strain transducer of art have highly sensitive, do not affected by light source light-intensity variation, advantage that capacity of resisting disturbance is strong.
By below in conjunction with the accompanying drawing detailed description to highly preferred embodiment of the present invention, the these and other of the present invention is excellent
Point will be apparent from.
Accompanying drawing explanation
The present invention can be by with reference to being better understood, wherein in institute below in association with the description given by accompanying drawing
Have in accompanying drawing and employ same or analogous reference to represent same or like parts.Described accompanying drawing is together with following
Describe the part comprising in this manual and being formed this specification together in detail, and be used for being further illustrated by this
The preferred embodiment of invention and the principle and advantage of the explanation present invention.In the accompanying drawings:
Fig. 1 is the structural representation of the example based on annular Research on Cavity Ring Down Spectroscopy strain transducer illustrating the present invention；
Fig. 2 is the schematic diagram of a kind of possible spectral distribution illustrating the sensor fibre grating shown in Fig. 1 and auxiliary fiber grating；
It will be appreciated by those skilled in the art that the element in accompanying drawing be only used to simple and clear for the sake of and illustrate, and
It is not necessarily drawn to scale.Such as, in accompanying drawing, the size of some element may be exaggerated relative to other elements, in order to has
Help improve the understanding to the embodiment of the present invention；
Fig. 3 is the strain detecting method based on annular Research on Cavity Ring Down Spectroscopy strain transducer illustrating the present invention.
Detailed description of the invention
Hereinafter in connection with accompanying drawing, the one exemplary embodiment of the present invention is described.For clarity and conciseness,
All features of actual embodiment are not the most described.It should be understood, however, that in any this actual enforcement of exploitation
Must make during example much specific to the decision of embodiment, in order to realize the objectives of developer, such as, symbol
Close those restrictive conditions relevant to system and business, and these restrictive conditions may have along with the difference of embodiment
Changed.Additionally, it also should be appreciated that, although development is likely to be extremely complex and time-consuming, but to having benefited from the disclosure
For those skilled in the art of content, this development is only routine task.
Here, also need to explanation a bit, in order to avoid having obscured the present invention because of unnecessary details, in the accompanying drawings
Illustrate only and according to the closely-related apparatus structure of the solution of the present invention and/or process step, and eliminate and the present invention
Other details that relation is little.
The embodiment provides a kind of based on annular Research on Cavity Ring Down Spectroscopy strain transducer, should be based on annular chamber
Ring-down spectroscopy technology strain transducer includes that ASE light source, the polarizer, electrooptic modulator, waveform generator, annular decline and swings chamber, light
Electric explorer and oscillograph；Annular decline swing chamber by the first bonder, first annular device, sensor fibre grating, EDFA amplifier,
Two bonders, the second circulator, auxiliary fiber grating and time delay optical fiber are constituted;The continuous light that ASE light source sends is through the polarizer
With become pulsed light after electrooptic modulator, this pulsed light is entered annular by the first input end of the first bonder and declines and swing chamber, and
Annular declines and swings intracavity often to circulate the partial pulse light having identical light intensity ratio one week defeated by the first outfan of the second bonder
Go out, receive subsequently into photodetector.
An example based on annular Research on Cavity Ring Down Spectroscopy strain transducer of the present invention is described below in conjunction with Fig. 1.
As it is shown in figure 1, based on annular Research on Cavity Ring Down Spectroscopy strain transducer, the present invention's includes that ASE light source 1, the polarizer 2, electric light are adjusted
Device 3 processed, waveform generator 4, annular decline and swing chamber 5, photodetector 6 and oscillograph 7.
Wherein, annular declines and swings chamber 5 and include the first bonder 501, first annular device 502, sensor fibre grating 503, EDFA
Amplifier the 504, second bonder the 505, second circulator 506, auxiliary fiber grating 507 and time delay optical fiber 508.
The outfan 501C of the first bonder 501 is connected with the input 502A of first annular device 502, first annular device
The input/output terminal 502B of 502 is connected with sensor fibre grating 503, and outfan 502C Yu EDFA of first annular device 502 amplifies
The input of device 504 connects, and the input 505C of EDFA amplifier 504 outfan and the second bonder 505 connects, the second coupling
First outfan 505A of device 505 is connected with photodetector 6, the second outfan 505B of the second bonder 505 and the second ring
The input 506A of shape device 506 connects, and the input/output terminal 506B of the second circulator 506 is connected with auxiliary fiber grating 507, the
The outfan 506C of second ring device 506 is connected with the input of described time delay optical fiber 508, the outfan of time delay optical fiber 508 and
Second input 501B of one bonder 501 connects.
As in figure 2 it is shown, the reflectance spectrum of described fiber grating 503 and auxiliary fiber grating 507 is all approximately Gaussian, sensing
The 3dB spectrum width of fiber grating 503 is less than the half of the 3dB spectrum width of auxiliary fiber grating 507, and in sensor fibre grating 503
On the slope of the reflectance spectrum that cardiac wave length is positioned at auxiliary fiber grating 507.
Sensor fibre grating 503 is the most sensitive to tested strain and ambient temperature, and auxiliary fiber grating 507 is to ambient temperature
Sensitive and insensitive to tested strain, and sensor fibre grating 503 and the auxiliary fiber grating 507 response phase to ambient temperature
With；
The pulsed light time needed for fiber annular intracavity circulates one week is 2-10 times of pulsed light width, for the pulsed light cycle
1/50-1/20。
ASE light source is wide spectrum light source, and output wavelength is 1530nm-1570nm, and output spectrum in this service band
Light intensity is identical.
The strain detecting method based on annular Research on Cavity Ring Down Spectroscopy strain transducer of the present invention is illustrated in conjunction with Fig. 3,
This detection method is:
Step one: waveform generator provides pulse signal to electrooptic modulator, make continuous light that ASE light source sends through the polarizer and
Become pulsed light after electrooptic modulator, by controlling the pulsewidth of this pulsed light and cycle and the length of time delay optical fiber, make pulse
Light declines in annular and swings the time needed for cavity circulation one weekt r 2-10 times, the 1/50-1/ in pulsed light cycle for pulsed light pulsewidth
20；
Step 2: declined by the gain-adjusted annular of regulation EDFA amplifier and swing the loop loss in chamber, is made oscillograph output decline and swings
Pulse voltage signal, then fix the gain of EDFA amplifier, it is ensured that during strain measurement this gain keep constant；
Step 3: according to the sideband slope of auxiliary optical fiber optical grating reflection spectrumk, the elasto-optical coefficient of sensor fibre gratingP e , light arteries and veins
Rush signal annular decline swing in chamber transmit one circle used by timet r Decline in annular with pulsed light and swing intracavity ring-down timeτChange
Change amountd τObtain the strain variation amount of sensor fibre gratingd ε 。
Compared to article 1(Daqing Tang, Dexing Yang, Yajun Jiang, Jianlin Zhao,
Haiyan Wang, Shiquan Jiang, “Fiber loop ring-down optical fiber grating gas
pressure sensor,”Optics and Lasers in Engineering, 2010,48:1262 1265.) and article
2(N. Ni, C. C. Chan, X. Y. Dong, J. Sunand P Shum, " Cavity ring-down long-
period fibregrating strain sensor,” Measurement Science and Technology, 2007,
18:3135 3138.), the present invention based on annular Research on Cavity Ring Down Spectroscopy strain transducer owing to have employed double optical fiber grating level
The mode of connection constitutes annular and declines and swing chamber, and the temperature-responsive of two fiber gratings is identical, causes annular to decline the loss swinging chamber and temperature
Spend unrelated, therefore can realize temperature self-compensation.And owing to only employing single optical grating in above-mentioned article 1, therefore cannot
Realize temperature self-compensation；In above-mentioned article 2 different with the temperature-responsive of fiber grating, the most also due to LPFG
Temperature-compensating can not be realized.
Additionally, relative to above-mentioned article 1, the present invention based on annular Research on Cavity Ring Down Spectroscopy strain transducer owing to using
ASE light source, therefore, also have can the advantage of multiple spot distributed sensing, and the sensor that above-mentioned article 1 discloses uses narrow
Band light source, therefore cannot realize distributed sensing.Relative to above-mentioned article 2, the strain transducer of the present invention also has sensitivity
High advantage, because what the mode of the strain transducer of the present invention have employed double optical fiber grating cascade disclosed than above-mentioned article 2
The mode that the long-period gratings that sensor is used cascades with fiber grating is highly sensitive.
Application example 1
An application example based on annular Research on Cavity Ring Down Spectroscopy strain transducer of the present invention is described below.
The continuous light that ASE light source sends becomes pulse light after being modulated by electrooptic modulator, laggard through the first bonder
Enter annular to decline and swing chamber and circulate repeatedly, in each circulation, only sub-fraction pulse light by the second bonder the
One outfan output, and detected by photodetector, remainder continues to decline in annular chamber to swing loss.By photodetector
The flashlight detected presents exponential decay form, can represent with following formula:
(1)
In formula (1), I represents the light intensity (namely the light intensity from second bonder the second outfan output) in the t moment,
L, c, n and δ represent that this annular declines respectively and swing the total length of chamber optical fiber, light spread speed in a fiber, the refraction of fiber core
Rate and the light total losses in annular chamber.And real-time pulse signal light intensity I can be drawn by (2) formula:
(2)
I 0Represent initial beam intensity (namely swinging the light intensity in chamber from annular the declining of first input end input of the first bonder),t r For
Light pulse signal transmits the time used by a circle in annular chamber, when photodetector detects that light intensity decays in annular chamber
Initial beam intensityI 01/eTime, the ring-down time of ring-down spectroscopyτDecline with annular and swing cavity lossδBetween relation be:
(3)
Formula (3) both sides are carried out differential can obtain:
(4)
In formula,δ 0It is that annular declines and swings the fixed loss value in chamber,δ ε It is that under external physical quantity effect, pulsed optical signals is single in sensing
The loss produced in unit.As in figure 2 it is shown, when sensing grating produces strainεTime, wherein cardiac wave length is relative to fill-in light fibre grating
Mobile Δλ, the loss causing flashlight to produce is
(5)
Wherein,kThe slope composed for auxiliary optical fiber optical grating reflection,P e For the elasto-optical coefficient of sensor fibre grating,εFor sense light
The strain of fine grating, ΔλVariable quantity for sensor fibre grating wavelength.
Formula (5) is substituted into formula (4) obtain:
(6)
Formula (6) shows: the variable quantity of sensor fibre grating straind εDecline in annular with pulsed light and swing the ring-down time of intracavity
Variable quantityd τIt is directly proportional, declines in annular and swing the ring-down time of intracavity by measuring pulsed light and can obtain sensor fibre grating
Strain.
Strain transducer of the present invention can the reason of temperature self-compensation:
Owing to sensor fibre grating is identical with auxiliary optical fiber grating material, and it is under equivalent environment, so they are to temperature
Response is identical, and during variation of ambient temperature, sensor fibre grating is identical, therefore with the change of auxiliary fiber bragg grating center wavelength
Temperature will not change sensor fibre grating and the relative position of auxiliary fiber bragg grating center wavelength, i.e. will not change annular and decline and swing chamber
Loss, and then pulsed light will not be changed decline in annular and swing the ring-down time of intracavity.Therefore, strain transducer of the present invention can realize
Temperature self-compensation.
Although the embodiment according to limited quantity describes the present invention, but benefits from above description, the art
In it is clear for the skilled person that in the scope of the present invention thus described, it can be envisaged that other embodiments.Additionally, it should be noted that
The language that uses in this specification primarily to the readable and purpose of teaching and select rather than in order to explain or limit
Determine subject of the present invention and select.Therefore, in the case of without departing from the scope of the appended claims and spirit, for this
For the those of ordinary skill of technical field, many modifications and changes will be apparent from.For the scope of the present invention, to this
The disclosure that invention is done is illustrative and not restrictive, and it is intended that the scope of the present invention be defined by the claims appended hereto.
Claims (5)
1. based on annular Research on Cavity Ring Down Spectroscopy strain transducer, it is characterised in that described based on annular Research on Cavity Ring Down Spectroscopy
Include strain transducer ASE light source (1), the polarizer (2), electrooptic modulator (3), waveform generator (4), annular decline swing chamber (5),
Photodetector (6) and oscillograph (7)；
Wherein, described annular declines and swings chamber (5) by the first bonder (501), first annular device (502), sensor fibre grating
(503), EDFA amplifier (504), the second bonder (505), the second circulator (506), auxiliary fiber grating (507) and time delay
Optical fiber (508) is constituted；
The outfan (501C) of described first bonder (501) is connected with the input (502A) of described first annular device (502),
The input/output terminal (502B) of described first annular device (502) is connected with sensor fibre grating (503), described first annular device
(502) outfan (502C) is connected with the input of described EDFA amplifier (504), described EDFA amplifier (504) defeated
Go out end to be connected with the input (505C) of described second bonder (505), the first outfan of described second bonder (505)
(505A) it is connected with described photodetector (6), second outfan (505B) and described second of described second bonder (505)
The input (506A) of circulator (506) connects, the input/output terminal (506B) of described second circulator (506) and auxiliary optical fiber
Grating (507) connects, and the outfan (506C) of described second circulator (506) connects with the input of described time delay optical fiber (508)
Connecing, the outfan of described time delay optical fiber (508) is connected with second input (501B) of described first bonder (501)；
The reflectance spectrum of described sensor fibre grating (503) and described auxiliary fiber grating (507) is all approximately Gaussian, described biography
The 3dB spectrum width of sense fiber grating (503) is less than the half of the 3dB spectrum width of described auxiliary fiber grating (507), and described sense light
On the sideband of the reflectance spectrum that the centre wavelength of fine grating (503) is positioned at described auxiliary fiber grating (507)；
Described sensor fibre grating (503) is the most sensitive to tested strain and ambient temperature, and described auxiliary fiber grating (507) is right
Ambient temperature is sensitive and insensitive to tested strain, and described sensor fibre grating (503) and described auxiliary fiber grating (507)
Response to ambient temperature is identical；
Described ASE light source is wide spectrum light source, and the light intensity of output spectrum is identical in service band；
The continuous light that described ASE light source (1) sends becomes arteries and veins after the described polarizer (2) and described electrooptic modulator (3)
Washing off, described pulsed light is entered described annular by the first input end (501A) of described first bonder and declines and swing chamber (5), and at ring
Shape declines and swings chamber (5) interior loop attenuation, and in each circulation, only sub-fraction pulse light passes through the second bonder
(505) the first outfan (505A) output, and detected by photodetector, remainder continues to decay in annular chamber.
The most according to claim 1 based on annular Research on Cavity Ring Down Spectroscopy strain transducer, it is characterised in that described first
The first input end (501A) of bonder (501) and the splitting ratio of the second input (501B) are 1:99, described second bonder
(505) the first outfan (505A) and the splitting ratio of the second outfan (505B) are 1:99.
3. according to described in any one of claim 1-2 based on annular Research on Cavity Ring Down Spectroscopy strain transducer, it is characterised in that
Described pulsed light declines in described annular and swings the 2-10 of the pulse width that time is described pulsed light needed for circulating a week in chamber (5)
Times, and described pulsed light declines in described annular and swings the 1/50-that time is the described pulsed light cycle needed for circulation in chamber (5) a week
1/20。
4. according to described in any one of claim 1-3 based on annular Research on Cavity Ring Down Spectroscopy strain transducer, it is characterised in that
The service band of described ASE light source (1) is 1530nm-1570nm.
Strain detecting method based on annular Research on Cavity Ring Down Spectroscopy strain transducer the most according to claim 1, it is special
Levying and be, described method is:
Step one: waveform generator (4) provides pulse signal to electrooptic modulator (3), makes the continuous light that ASE light source (1) sends
Pulsed light is become, by controlling the pulsewidth of this pulsed light and cycle and time delay light after the polarizer (2) and electrooptic modulator (3)
The length of fine (508), the time needed for making pulsed light circulate one week in annular declines and swings chamber (5)t r 2-10 for pulsed light pulsewidth
Again, the 1/50-1/20 in pulsed light cycle；
Step 2: declined by the gain-adjusted annular of regulation EDFA amplifier (504) and swing the loop loss of chamber (5), make oscillograph
(7) output declines the pulse voltage signal swung, and then fixes the gain of EDFA amplifier (504), it is ensured that during strain measurement this
Gain keeps constant；
Step 3: according to the sideband slope of auxiliary fiber grating (507) reflectance spectrumk, the bullet spectrum of sensor fibre grating (503)
NumberP e , light pulse signal declines the time swung in chamber (5) used by transmission one circle in annulart r Decline in annular with pulsed light and swing chamber (5)
Interior ring-down timeτVariable quantityd τObtain the strain variation amount of sensor fibre grating (503)dε 。
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| CN107990996A (en) * | 2017-11-03 | 2018-05-04 | 黑龙江工程学院 | A kind of temperature sensor based on interference spectrum cursor effect and annular Research on Cavity Ring Down Spectroscopy |
| CN108827346A (en) * | 2018-04-13 | 2018-11-16 | 南京理工大学 | Resonant transducer temperature-compensation method based on continuous ring-down |
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| CN111896036A (en) * | 2020-07-13 | 2020-11-06 | 湖北工业大学 | Demodulation method of continuous wave space domain fiber grating cavity ring-down sensor system |
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| CN116538945A (en) * | 2023-04-07 | 2023-08-04 | 常州厚德再生资源科技有限公司 | High-speed strain optical fiber sensor for molding and detecting regenerated organic resin composite section and measuring method thereof |
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