CN205909795U - Decline based on annular chamber and swing spectral technique strain sensor - Google Patents
Decline based on annular chamber and swing spectral technique strain sensor Download PDFInfo
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- CN205909795U CN205909795U CN201620694067.4U CN201620694067U CN205909795U CN 205909795 U CN205909795 U CN 205909795U CN 201620694067 U CN201620694067 U CN 201620694067U CN 205909795 U CN205909795 U CN 205909795U
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Abstract
The utility model provides a decline based on annular chamber and swing spectral technique strain sensor. Include strain sensor ASE light source, the polarizer, electric optic modem, waveform generator, annular decline and swing chamber, photoelectric detector and oscilloscope, the annular declines and swings the chamber and comprise first coupler, first circulator, sensing fiber grating, EDFA amplifier, second coupler, second circulator, supplementary fiber grating and time delay optic fibre, the spectral width of sensing fiber grating is about supplementary fiber grating's spectral width half the, and the center wavelength of sensing fiber optical grating reflection register for easy reference is located the side band of supplementary fiber grating reflectance spectrum. The continuous light that the ASE light source sent becomes pulse light behind the light polarizer, optoelectronic modulator, pulse light declines in the annular and swings the decay of intracavity manifold cycles, and in circulation at every turn, only sub -fraction pulse signal light is exported through the first output of second coupler to detected by photoelectric detector, all the other parts continue to attenuate in the annular chamber. Produce when meeting an emergency when the sensing fiber grating, the relative position of sensing fiber grating and supplementary fiber grating's spectrum changes, leads to the annular to decline the loss of swinging the chamber and changes, and then lead to pulse signal's the time of swinging of declining to change, consequently can obtain meeting an emergency of sensing fiber grating through the time of swinging of declining of surveying pulse signal. Because sensing fiber grating and supplementary fiber grating's temperature response is the same, lead to the temperature variation can not change annular the declining the time of swinging of the loss of swinging the chamber and light pulse signal of declining, therefore temperature automatic compensation can be realized to this sensor. Swing the spectral technique owing to adopted the optic fibre circulator to decline, the utility model discloses an above -mentioned sensor still have measurement accuracy high with the advantage of photic source follower influence of fluctuations not.
Description
Technical field
This utility model is related to strain sensing technology, and more particularly, to one kind is based on annular Research on Cavity Ring Down Spectroscopy strain sensing
Device.
Background technology
Fiber Bragg grating strain sensor using laser as the carrier of strain information, using fiber-optic transfer laser, therefore, with biography
System the signal of telecommunication based on strain transducer compare, have electric insulation, electromagnetism interference, small volume, lightweight, can multichannel answer
With, can live real-time telemetry and range of dynamic measurement wide many advantages, such as, therefore, be now widely used for civil engineering structure,
The industries such as aerospace, ship shipping business, power industry, petrochemical industry, medical science, nuclear industry, especially in high voltage, by force
In electromagnetic field, inflammable and explosive adverse circumstances, there is very strong application advantage.
Fiber grating not only strain sensitive, simultaneously to temperature also quite sensitive, hence with fiber grating measuring strain
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 sensitivity height, is not subject to light source intensity
The advantages of influence of fluctuations, strong antijamming capability, attract wide attention, become one of technical way of 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 pressure transducer based on fiber annular cavity ring-down spectroscopy technology and single fiber grating, although
This sensor can improve the measurement sensitivity of fiber grating in theory, but due 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.) and disclose one kind based on fiber optic loop
The strain transducer of shape Research on Cavity Ring Down Spectroscopy, long-period gratings and fiber grating, due to long-period gratings and fiber grating pair
The response of temperature is different, therefore, this strain transducer equally cannot compensation temperature impact.
Content of the invention
With regard to this utility model of the present utility model brief overview is given below, to provide new with regard to this practicality
The basic comprehension of some aspects of type.It should be appreciated that this general introduction is not with regard to exhaustive general introduction of the present utility model.It is simultaneously
It is not intended to determine of the present utility model crucial or pith, be not intended limitation scope of the present utility model.Its purpose
It is only to provide some concepts in simplified form, in this, as the preamble in greater detail discussed after a while.
In consideration of it, this utility model provides one kind based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain detecting
Method, is done by temperature at least to solve the existing strain transducer based on fiber annular cavity ring-down spectroscopy technology and fiber grating
The problem disturbed.
According to one side of the present utility model, there is provided a kind of based on annular Research on Cavity Ring Down Spectroscopy strain transducer and
Strain detecting method, should based on annular Research on Cavity Ring Down Spectroscopy strain transducer include ase light source, the polarizer, electrooptic modulator,
Waveform generator, annular decline and swing chamber, photodetector and oscillograph；Wherein, annular declines and swings 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;
The continuous light that ase light source sends is changed into pulsed light through the polarizer, and this pulsed light declines in annular and swings cavity circulation decay, after decay
By the second outfan output of the second bonder, subsequently into photodetector, photodetector will receive pulsed optical signals
Decline 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 is connected with the input of the second bonder, and the first outfan of the second bonder is connected with photodetector, the
Second outfan of two bonders is connected with the input of the second circulator, the input/output terminal of the second circulator with 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 located at fill-in light
On the slope of the reflectance spectrum of fine grating；Sensor fibre grating is simultaneously sensitive to tested strain and ambient temperature, assists fiber grating
Insensitive to tested strain to ambient temperature sensitivity, and the response of sensor fibre grating and 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 is changed into pulsed light after the polarizer and electrooptic modulator, this pulse
Light enters annular by the first input end of the first bonder and declines and swing chamber, and declines to swing intracavity and often circulate one week in annular 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 splitting ratio of the first input end of described first bonder and the second input is 1:99, described the
The splitting ratio of the first outfan of two bonders and the second outfan is 1:99.
Further, pulsed light declines 2-10 times that the time swung needed for cavity circulation one week is pulse optical width in annular,
1/50-1/20 for the pulse photoperiod.
Further, the service band of ase light source is 1530nm-1570nm.
Of the present utility model based on annular Research on Cavity Ring Down Spectroscopy strain transducer, by two fiber gratings are declined in annular
The mode swinging intracavity cascade solves the interference problem to sensor fibre grating for the temperature, due to employing fiber annular cavity-type BPM light
This strain transducer of spectral technology has the advantages that sensitivity is high, is not affected by light source light-intensity variation, strong antijamming capability.
By the detailed description to most preferred embodiment of the present utility model below in conjunction with accompanying drawing, of the present utility model these with
And other advantages will be apparent from.
Brief description
This utility model can be by reference to being better understood below in association with the description given by accompanying drawing, wherein
Employ same or analogous reference in all of the figs to represent same or like part.Described accompanying drawing together with
The detailed description in face comprises together in this manual and forms the part of this specification, and is used for illustrating further
Bright preferred embodiment of the present utility model and explanation principle and advantage of the present utility model.In the accompanying drawings:
Fig. 1 is the structure illustrating an example based on annular Research on Cavity Ring Down Spectroscopy strain transducer of the present utility model
Schematic diagram；
Fig. 2 is the signal of a kind of possible spectral distribution illustrating the sensor fibre grating shown in Fig. 1 and auxiliary fiber grating
Figure；
It will be appreciated by those skilled in the art that element in accompanying drawing be used for the purpose of simple and clear for the sake of and illustrate,
And be not necessarily drawn to scale.For example, in accompanying drawing, the size of some elements may be exaggerated with respect to other elements, with
Just it is favorably improved the understanding to this utility model embodiment；
Fig. 3 is to illustrate the strain detecting method based on annular Research on Cavity Ring Down Spectroscopy strain transducer of the present utility model.
Specific embodiment
Hereinafter in connection with accompanying drawing, one exemplary embodiment of the present utility model is described.Rise for clarity and conciseness
See, do not describe all features of actual embodiment in the description.It should be understood, however, that developing any this reality
A lot of decisions specific to embodiment must be made, to realize the objectives of developer, example during embodiment
As met those restrictive conditions related to system and business, and these restrictive conditions may with embodiment not
Change together.Additionally, it also should be appreciated that although development is likely to be extremely complex and time-consuming, but to having benefited from
For those skilled in the art of present disclosure, this development is only routine task.
Here is in addition it is also necessary to illustrate is a bit, in order to avoid having obscured this utility model because of unnecessary details, attached
In figure illustrate only and the apparatus structure closely related according to scheme of the present utility model and/or process step, and eliminates
The other details little with this utility model relation.
Embodiment of the present utility model provides one kind based on annular Research on Cavity Ring Down Spectroscopy strain transducer, should be based on ring
Shape Research on Cavity Ring Down Spectroscopy strain transducer includes ase light source, the polarizer, electrooptic modulator, waveform generator, annular decline and swing
Chamber, photodetector and oscillograph；Annular declines and swings chamber by the first bonder, first annular device, sensor fibre grating, edfa amplification
Device, the second bonder, the second circulator, auxiliary fiber grating and time delay optical fiber are constituted;The continuous light that ase light source sends passes through
It is changed into pulsed light, this pulsed light is entered annular and declined by the first input end of the first bonder and swings after the polarizer and electrooptic modulator
Chamber, and decline to swing intracavity and often circulate one week in annular and have the partial pulse light of identical light intensity ratio first defeated by the second bonder
Go out end output, receive subsequently into photodetector.
To describe with reference to Fig. 1 and of the present utility model to be shown based on one of annular Research on Cavity Ring Down Spectroscopy strain transducer
Example.As shown in figure 1, of the present utility model include ase light source 1, the polarizer based on annular Research on Cavity Ring Down Spectroscopy strain transducer
2nd, electrooptic modulator 3, 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 504, the second bonder 505, the 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
502 input/output terminal 502b is connected with sensor fibre grating 503, and the outfan 502c and edfa of first annular device 502 amplify
The input of device 504 connects, and the outfan of edfa amplifier 504 is connected with the input 505c of the second bonder 505, the second coupling
First outfan 505a of clutch 505 is connected with photodetector 6, the second outfan 505b and second of the second bonder 505
The input 506a of circulator 506 connects, and the input/output terminal 506b of the second circulator 506 is connected with auxiliary fiber grating 507,
The outfan 506c of the second circulator 506 is connected with the input of described time delay optical fiber 508, the outfan of time delay optical fiber 508 with
Second input 501b of the first bonder 501 connects.
As shown in Fig. 2 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
Cardiac wave length is located on the slope of reflectance spectrum of auxiliary fiber grating 507.
Sensor fibre grating 503 is simultaneously 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 response phase to ambient temperature for the fiber grating 507
With；
Pulsed light is 2-10 times of pulse optical width in the time needed for fiber annular cavity circulation one week, is that pulsed light is all
The 1/50-1/20 of phase.
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；
Illustrate the strain detecting side based on annular Research on Cavity Ring Down Spectroscopy strain transducer of the present utility model in conjunction with Fig. 3
Method, this detection method is:
Step one: waveform generator provides pulse signal to electrooptic modulator, makes the continuous light that ase light source sends through being polarized
It is changed into pulsed light after device and electrooptic modulator, by controlling the pulsewidth of this pulsed light and the length of cycle and time delay optical fiber, make
Pulsed light declines the time swung needed for cavity circulation one week in annulart r For 2-10 times of pulsed light pulsewidth, the pulse photoperiod 1/
50-1/20；
Step 2: declined by the gain-adjusted annular adjusting edfa amplifier and swing the loop loss in chamber, make oscillograph export
Decline the pulse voltage signal swinging, and then fixes the gain of edfa amplifier it is ensured that this gain keeps constant during strain measurement；
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
Pulse signal declines the transmission one circle time used in chamber of swinging in annulart r Decline in annular with pulsed light and swing intracavity ring-down timeτ's
Variable quantityd 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:
And article 2(n. ni, 1262 1265.) 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.), of the present utility model based on annular cavity ring-down spectroscopy skill
Art strain transducer declines because the mode employing double optical fiber grating cascade constitutes annular and swings chamber, and the temperature of two fiber gratings
Response identical, lead to annular decline swing chamber loss temperature independent, therefore can achieve temperature self-compensation.And in above-mentioned article 1
Due to only employing single optical grating, temperature self-compensation therefore cannot be realized；Due to long period optical fiber light in above-mentioned article 2
Grid are different with the temperature-responsive of fiber grating, therefore nor realize temperature-compensating.
Additionally, with respect to above-mentioned article 1, of the present utility model based on annular Research on Cavity Ring Down Spectroscopy strain transducer due to
Employ ase light source, therefore, also have the advantages that can multiple spot distributed sensing, and above-mentioned article 1 disclose sensor adopt
It is narrow-band light source, therefore cannot realize distributed sensing.With respect to above-mentioned article 2, strain transducer of the present utility model also has
Have the advantages that sensitivity is high, because the mode of strain transducer of the present utility model employed double optical fiber grating cascade is than above-mentioned
The sensor that article 2 discloses using the cascade of long-period gratings and fiber grating by the way of sensitivity height.
Application example 1
An application example based on annular Research on Cavity Ring Down Spectroscopy strain transducer of the present utility model is described below.
The continuous light that ase light source sends is changed into pulse light after being modulated by electrooptic modulator, laggard through the first bonder
Enter annular and decline to swing chamber circulation repeatedly, in each circulation, only sub-fraction pulse light passes through the of the second bonder
One outfan output, and detected by photodetector, remainder continues to decline in annular chamber to swing loss.By photodetector
The flashlight detecting assumes exponential decay form, can be represented with following formula:
(1)
In formula (1) i represent the t moment light intensity (namely from second bonder the second outfan output light intensity
), 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 folding of fiber core
Penetrate the rate and light total losses in annular intracavity.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
Transmit the circle time used for light pulse signal in annular chamber, decay in annular intracavity when photodetector detects light intensity
To initial beam intensityi 01/eWhen, the ring-down time of ring-down spectroscopyτDecline with annular and swing cavity lossδBetween relation be:
(3)
Carry out differential to formula (3) both sides can obtain:
(4)
In formula,δ 0It is that annular declining swings the fixed loss value in chamber,δ ε It is the lower pulsed optical signals of external physical quantity effect in sensing
The loss producing in unit.As shown in Fig. 2 when sensing grating produces strainεWhen, wherein cardiac wave length is with respect to fill-in light fibre light
Grid move δλ, lead to flashlight produce loss be
(5)
Wherein,kFor assisting the slope of fiber grating reflectance spectrum,p e For the elasto-optical coefficient of sensor fibre grating,εFor sensing
The strain of fiber 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 εWith pulsed light annular decline swing intracavity decline swing when
Between variable quantityd τIt is directly proportional, swing the ring-down time of intracavity and can obtain sensor fibre light by measuring pulsed light and declining in annular
Grid strain.
This utility model strain transducer can temperature self-compensation the reason:
Because sensor fibre grating is identical with auxiliary optical fiber grating material, and it is under equivalent environment, so they are to temperature
The response of degree is identical, and during variation of ambient temperature, sensor fibre grating is identical with the change of auxiliary fiber bragg grating center wavelength,
Therefore temperature will not change sensor fibre grating and the relative position of auxiliary fiber bragg grating center wavelength, will not change annular and decline
Swing the loss in chamber, entering declines in annular without change pulsed light swings the ring-down time of intracavity.Therefore, this utility model strain sensing
Device can achieve temperature self-compensation.
Although this utility model is described according to the embodiment of limited quantity, benefit from above description, this technology
Skilled person understands, it can be envisaged that other embodiments in the range of this utility model thus describing.Additionally,
It should be noted that used in this specification language primarily to the purpose of readable and teaching and select, rather than in order to
Explain or limit theme of the present utility model and select.Therefore, without departing from the scope of the appended claims and spirit
In the case of, many modifications and changes will be apparent from for those skilled in the art.For this
The scope of utility model, the disclosure that this utility model is done is illustrative and not restrictive, scope of the present utility model
It is defined by the appended claims.
Claims (4)
1. be 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
Strain transducer includes 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)
Input (506a) connection of circulator (506), 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) is connected with the input of described time delay optical fiber (508)
Connect, 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
The centre wavelength of fine grating (503) is located on the sideband of reflectance spectrum of described auxiliary fiber grating (507)；
Described sensor fibre grating (503) is simultaneously 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 assist 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 is changed into after the polarizer described in transmission from one meridian to another (2) and described electrooptic modulator (3)
Pulsed light, described pulsed light is entered described annular and is declined by the first input end (501a) of described first bonder and swings chamber (5), and
Annular declines and swings the decay of chamber (5) interior circulation, 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.
2. according to claim 1 based on annular Research on Cavity Ring Down Spectroscopy strain transducer it is characterised in that described first
The splitting ratio at the first input end (501a) of bonder (501) and end the second input (501b) is 1:99, described second coupling
The splitting ratio of first outfan (505a) of device (505) and the second outfan (505b) is 1:99.
3. according to 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 the 2-10 of the pulse width that the time swung needed for chamber (5) interior circulation one week is described pulsed light
Times, and described pulsed light declines the 1/50- that the time swung needed for chamber (5) interior circulation one week is the described pulse photoperiod in described annular
1/20.
4. according to claim 1 based on annular Research on Cavity Ring Down Spectroscopy strain transducer it is characterised in that described ase
The service band of light source (1) is 1530nm-1570nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201620694067.4U CN205909795U (en) | 2016-07-05 | 2016-07-05 | Decline based on annular chamber and swing spectral technique strain sensor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620694067.4U CN205909795U (en) | 2016-07-05 | 2016-07-05 | Decline based on annular chamber and swing spectral technique strain sensor |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106091973A (en) * | 2016-07-05 | 2016-11-09 | 哈尔滨理工大学 | Based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain detecting method |
| CN106950194A (en) * | 2017-03-17 | 2017-07-14 | 哈尔滨翰奥科技有限公司 | Gas sensor and the method for detecting concentration of SO 2 gas change |
| CN110715614A (en) * | 2019-10-18 | 2020-01-21 | 西安建筑科技大学 | Spiral optical fiber sensing strain testing device and method for prestressed FRP (fiber reinforced Plastic) ribs |
-
2016
- 2016-07-05 CN CN201620694067.4U patent/CN205909795U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106091973A (en) * | 2016-07-05 | 2016-11-09 | 哈尔滨理工大学 | Based on annular Research on Cavity Ring Down Spectroscopy strain transducer and strain detecting method |
| CN106950194A (en) * | 2017-03-17 | 2017-07-14 | 哈尔滨翰奥科技有限公司 | Gas sensor and the method for detecting concentration of SO 2 gas change |
| CN110715614A (en) * | 2019-10-18 | 2020-01-21 | 西安建筑科技大学 | Spiral optical fiber sensing strain testing device and method for prestressed FRP (fiber reinforced Plastic) ribs |
| CN110715614B (en) * | 2019-10-18 | 2021-05-28 | 西安建筑科技大学 | Spiral optical fiber sensing strain testing device and method for prestressed FRP (fiber reinforced Plastic) ribs |
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Granted publication date: 20170125 Effective date of abandoning: 20180309 |