CN105890536B - A method of measuring strain is used for based on ultrasonic pulse induction grating deformation - Google Patents
A method of measuring strain is used for based on ultrasonic pulse induction grating deformation Download PDFInfo
- Publication number
- CN105890536B CN105890536B CN201610215074.6A CN201610215074A CN105890536B CN 105890536 B CN105890536 B CN 105890536B CN 201610215074 A CN201610215074 A CN 201610215074A CN 105890536 B CN105890536 B CN 105890536B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- strain
- grating
- peak
- spacing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Abstract
The present invention provides a kind of method for measuring strain inducing grating deformation based on ultrasonic pulse, the method for the measuring strain includes the following steps：A) fibre optical sensor strain measurement system is overlapped, the system comprises optical fiber, supersonic generator and (FBG) demodulators that one section carries continuous uniform grating, there is the optical fiber with continuous uniform grating multistage grating, every section of raster grid to be uniformly distributed, are spaced between the grating identical；B) fibre optical sensor strain measurement system is bonded with strain gauge material to be measured, records the collected spacing for deviateing main peak from peak of the (FBG) demodulator；C) spacing for deviateing main peak from peak described in step b) is compared with the spacing for deviateing main peak from peak with the relation curve of strain variation, obtains material strain size.
Description
Technical field
It is the present invention relates to Fiber Bragg Grating technology field, more particularly to a kind of that being used for for grating deformation is induced based on ultrasonic pulse
The method of measuring strain
Background technology
In general, the purpose measured is to obtain research object for information about, and handled, is then gone again accordingly
Control object, it is sensing technology to complete this functional performance.The basic functional principle of fibre optical sensor is will to come from light source
Light by optical fiber be sent into modulator, make parameter to be measured with enter modulator zone light interaction after, lead to the optical property of light
(intensity, wavelength, frequency, phase, the polarization state of such as light) changes, the signal light referred to as modulated, and is sent by optical fiber
Enter optical detector, it is demodulated, obtain measured parameter.In recent years, sensor towards sensitive, accurate, adaptable, small and exquisite and
Intelligentized direction is developed.In this course, the newcomer of this sensor family of fibre optical sensor gains great popularity.Optical fiber has
There are many excellent performances, such as：The performance of electromagnetism interference and atomic radiation, the mechanical performance that diameter is thin, matter is soft, light-weight；
Insulation, inductionless electric property；Water-fast, high temperature resistant, corrosion resistant chemical property etc., it can be in the place that people is not achieved
(such as high-temperature region), or the area (such as nuclear radiation area) that is pernicious to people, play the role of the knowledge of people, and can also surmount people's
Physiological limits, the external information that the sense organ of recipient is not felt by.As dense wave division multipurpose DWDM technologies, Er-doped fiber are put
Development and the maturation of big device EDFA technologies and Optical Time Division Multiplexing OTDR technique, Fibre Optical Communication Technology is just towards ultrahigh speed, large capacity
The direction of communication system is developed, and gradually to all-optical network evolution.Under the drive that optic communication is grown rapidly, fibre optical sensor
As to material strain measurement and magnetic field, temperature occasion, solution refractive index measurement in terms of play an important role.
However traditional fibre optical sensor only improves sensor only around the change of light source and optical fiber own material
Accuracy is greatly limited.
Therefore, it is necessary to it is a kind of can effectively in a fiber the method for coupling ultrasonic wave cause grating deformation measurement strain side
Method.
Invention content
The method for measuring strain that grating deforms is induced based on ultrasonic pulse the purpose of the present invention is to provide a kind of,
In one aspect, the method for the measuring strain includes the following steps：
A) fibre optical sensor strain measurement system is overlapped, the system comprises pumping source, the first optical fiber, a wavelength-division multiplex
Device, one section of optical fiber, supersonic generator and (FBG) demodulator for carrying continuous uniform grating, the light with continuous uniform grating
Fine one end is bulbous end, and the supersonic generator is equipped with transmitting probe, and the transmitting probe is fixed with the bulbous end,
The (FBG) demodulator is connect with the optical fiber other end with continuous uniform grating；The optical fiber with continuous uniform grating
With multistage grating, every section of raster grid is uniformly distributed, and is spaced between the grating identical；
B) fibre optical sensor strain measurement system is bonded with strain gauge material to be measured, record the (FBG) demodulator it is collected from
Deviate the spacing of main peak in peak；
C) by the spacing from peak deviation main peak described in step b) and the spacing from peak deviation main peak with strain variation
Relation curve compares, and obtains material strain size.
In one aspect, the method for the measuring strain deviates the spacing of main peak with strain in the step c) from peak
The relation curve of variation is obtained by calibration, and the calibration includes the following steps：
(1) optical fiber with continuous uniform grating is bonded with controllable strain gauge material；
(2) the pumping source transmitting light wave enters first optical fiber, and the supersonic generator transmitting ultrasonic wave enters
The optical fiber with continuous uniform grating；
(3) the collected spacing for deviateing main peak from peak of record (FBG) demodulator moment t；
(4) gradually increase the strain of strain gauge material, the process of repeating said steps (2) to step (3), record (FBG) demodulator with
The t collected differently strained caused spacing for deviateing main peak from peak at the time of identical in the step (3)；
(5) it is fitted and deviates the spacing of main peak with the relation curve of strain variation from peak.
In one aspect, the method for the measuring strain, the bulbous end are beads made of optical fiber connector sintering,
It is fixed by silica gel between the bead and the ultrasonic probe.
In one aspect, the method for the measuring strain is coated between the bead and the ultrasonic probe and leads sound paste,
The sound paste of leading is optoacoustic matching materials, enters optical fiber for coupled acoustic wave.
In one aspect, the method for the measuring strain, the ultrasonic wave described in step (2) are propagated with longitudinal waves,
The wavelength of the ultrasonic wave is more than the grid length of the grating.
In one aspect, the method for the measuring strain, the ultrasonic wavelength are 1cm-2cm.
In one aspect, the method for the measuring strain, the middle method for increasing strain of the step (4) is to stretch, is curved
Bent, vibration squeezes.
In one aspect, the method for the measuring strain, it is described to deviate the spacing of main peak with strain variation from peak
Relation curve is fitted by linear fit or least square method.
On the other hand, the present invention provides the Optical Fiber Sensor Measurement System of the measuring strain method, the surveys
Amount system includes pumping source, the first optical fiber, a wavelength division multiplexer, one section of optical fiber, ultrasonic wave hair with continuous uniform grating
Raw device and (FBG) demodulator；
Described optical fiber one end with continuous uniform grating is bulbous end；
The supersonic generator is popped one's head in equipped with overshot, and the transmitting probe is fixed with the bulbous end, the demodulation
Instrument is connect with the optical fiber other end with continuous uniform grating, and the optical fiber with continuous uniform grating has multistage
Grating, every section of raster grid are uniformly distributed, and are spaced between the grating identical.
A kind of method for measuring strain inducing grating deformation based on ultrasonic pulse provided by the invention, by that will surpass
Sound wave is thin to be coupled in grating fibers, and raster grid is caused to deform, to be formed from peak in light wave main peak both sides, the present invention to from
Peak monitors and carries out strain measurement, keeps the accuracy of strain measurement more accurate.
It should be appreciated that aforementioned description substantially and follow-up description in detail are exemplary illustration and explanation, it should not
As the limitation to the claimed content of the present invention.
Description of the drawings
With reference to the attached drawing of accompanying, the more purposes of the present invention, function and advantage are by the as follows of embodiment through the invention
Description is illustrated, wherein：
Fig. 1 schematically shows the Optical Fiber Sensor Measurement System of measuring strain of the present invention；
Fig. 2 shows the schematic diagrames that the present invention carries continuous uniform grating fibers；
Fig. 3 shows the schematic diagram of grid before fiber coupling ultrasonic wave of the present invention；
Fig. 4 shows the reflectance spectrum of fiber coupling ultrasonic wave prepulse of the present invention；
Fig. 5 shows the schematic diagram of grid after fiber coupling ultrasonic wave of the present invention；
Fig. 6 show optical fiber of the present invention ultrasonic pulse effect under occur from peak；
Fig. 7 shows that the present invention deviates the schematic diagram of main peak when differently strained from peak；
Fig. 8 shows the curve of the invention for deviateing main peak spacing with strain variation from peak.
Specific implementation mode
By reference to exemplary embodiment, the purpose of the present invention and function and the side for realizing these purposes and function
Method will be illustrated.However, the present invention is not limited to exemplary embodiment as disclosed below；Can by different form come
It is realized.The essence of specification is only to aid in the detail of the various equivalent modifications Integrated Understanding present invention.
Hereinafter, the embodiment of the present invention will be described with reference to the drawings.In the accompanying drawings, identical reference numeral represents identical
Or similar component or same or like step.
The present invention provides a kind of method for measuring strain inducing grating deformation based on ultrasonic pulse, the present embodiment
In, the Optical Fiber Sensor Measurement System of measuring strain of the present invention as shown in Figure 1, the system comprises pumping source 101, the first optical fiber
102, optical fiber 106, supersonic generator 105 and demodulation of 103, one sections of the wavelength division multiplexer with continuous uniform grating 108
Instrument 104；Optical fiber one end with continuous uniform grating is bulbous end；It is small made of sintering that bulbous end is that optical fiber end passes through
Ball 107；Supersonic generator is equipped with ultrasonic probe, and the bead 107 of the hair ultrasonic probe and the optical fiber connector passes through silica gel
It is fixed.It is coated between ultrasonic probe and bead 107 and leads sound paste, leading sound paste as acoustic matching material enables sound wave to be coupled to light
In fibre.(FBG) demodulator 104 is connect with 106 other end of optical fiber with continuous uniform grating 108, the reflection for acquiring optical fiber
Wave spectrum.
The principle that ultrasonic wave induces grating deformation is detailed below：
As shown in Figure 2 the present invention carry continuous uniform grating fibers schematic diagram, with continuous uniform grating optical fiber by
The fiber grating 108 of multistage identical parameters is composed in series or is directly distributed continuous uniform grating, preferably uses and divides in the present embodiment
There is grating fibers made of the mode of cloth continuous uniform grating multistage grating, every section of raster grid to be uniformly distributed, grating and light
Spacing between grid is identical.
When the light that pumping source 101 the emits grid of middle distribution continuous uniform grating fibers through the embodiment of the present invention, light
Mechanically deform will not occur for fine grid 108a, the schematic diagram of grid before fiber coupling ultrasonic wave of the present invention as shown in Figure 3.Light wave
Completely by grating fibers, demodulated instrument 104 acquires the reflectance spectrum of grating fibers, and a main peak, such as Fig. 4 occurs in reflectance spectrum
The reflectance spectrum of shown fiber coupling ultrasonic wave prepulse of the present invention.
When the ultrasonic wave that supersonic generator 105 is launched between ultrasonic probe and optical fiber connector sintering bead 107 through leading
Sound paste by ultrasonic wave-coupled to optical fiber, meanwhile, the light that pumping source 101 is launched enters multiple by wavelength-division after the first optical fiber 102
Light wave is coupled in the optical fiber with continuous uniform grating to device 103.Ultrasonic wave is in the form of longitudinal wave in a fiber to forward pass
It broadcasts, before ultrasonic propagation to n-th section of grating, mechanically deform occurs for the grid 108b that can induce optical fiber, when ultrasonic wave leaves n-th
After section grating, mechanically deform restores, the schematic diagram of grid after fiber coupling ultrasonic wave of the present invention as shown in Figure 5.In the present invention, hair
The wavelength for penetrating ultrasonic wave is more than the grid length of grating fibers, by (FBG) demodulator at the time of ultrasonic wave passes completely through n-th section of grating
104 collected reflectance spectrums can occur two from peak at the both ends of main peak, and optical fiber of the present invention as shown in FIG. 6 is in ultrasonic pulse
Effect is lower occur from peak.
The method by measuring material strain from peak in the present embodiment is detailed below：
Overlap fibre optical sensor strain measurement system：
The fiber optic sensor system for building measuring strain, the system comprises 102, pumping source 101, the first optical fiber waves
103, one sections of optical fiber 106, supersonic generator 105 and (FBG) demodulators 104 for carrying continuous uniform grating of division multiplexer；With continuous
Optical fiber one end of uniform grating is bulbous end；Bulbous end is that optical fiber end passes through bead 107 made of sintering；Ultrasonic wave is sent out
Raw device is equipped with ultrasonic probe, and the bead 107 of the hair ultrasonic probe and the optical fiber connector is fixed by silica gel.In ultrasonic probe
It is coated between bead and leads sound paste, leading sound paste as acoustic matching material enables sound wave to be coupled in optical fiber.(FBG) demodulator 104 and institute
It states 106 other end of optical fiber with continuous uniform grating to connect, the reflectance spectrum for acquiring optical fiber.
Strain calibration is carried out to fibre optical sensor strain measurement system：
Optical fiber 106 with continuous uniform grating is bonded with controllable strain gauge material 109, chooses epoxy resin (Epoxy
Resin) or acrylate is as adhesive, and the grid zone of grating fibers is fixed on material surface in a manner of pasting.Pumping
Source 101 emits light wave and enters the first optical fiber 102, and supersonic generator 105 emits ultrasonic wave and burnt through ultrasonic probe and optical fiber connector
Sound paste being led between knot bead 107, ultrasonic wave-coupled being entered into the optical fiber 106 with continuous uniform grating, ultrasonic wave is in grating fibers
In propagated forward in the form of longitudinal wave, the wavelength of ultrasonic wave is more than the grid length of grating fibers, it is preferable that in the present embodiment,
The ultrasonic wavelength that supersonic generator 105 emits is 1cm-2cm.Light wave in first optical fiber 102 passes through wavelength division multiplexer 103
It is coupled to the optical fiber 106 with continuous uniform grating.Record the collected spacing for deviateing main peak from peak of (FBG) demodulator t moment.
Change the strain value ε of strain gauge material by strain controlling device 1101, mutually t is collected in the same time answers for record (FBG) demodulator
Become the caused distance s for deviateing main peak from peak1, shifting gears for strain can be by strain controlling device 110 to material progress
It stretches, compress or is bent, the mode preferably stretched in the present embodiment.It repeats the above process, the differently strained ε of recording materials2、ε3、…
εnCorresponding (FBG) demodulator mutually in the same time t it is collected from peak deviate main peak distance s2、、s3…sn, of the invention as shown in Figure 7
Deviate the schematic diagram of main peak from peak when differently strained.It is fitted relation curve of the spacing from peak deviation main peak with strain variation,
Least-squares algorithm linear fitting can be used in curve matching, as shown in formula 1.
Y=ax+b (1)
Least square fitting can also be used in curve matching, and matched curve can be released by following equatioies (2) and (3).
Solving equations find out a0And a1, so that it may construct the approximating function for meeting square approach condition.
F (x)=a0+a1x (4)
The curve for deviateing main peak spacing with strain variation from peak that the embodiment of the present invention as shown in Figure 8 is fitted.
Strain gauge material to be measured is measured：
Fibre optical sensor strain measurement system is bonded with strain gauge material to be measured, record moment t is collected to be deviateed from peak
The distance s of main peak, will deviate the distance s of main peak from peak and the fibre optical sensor strain measurement system of calibration deviates main peak from peak
Spacing is compared with the relation curve of strain variation, obtains material strain size.
Explanation in conjunction with the present invention disclosed here and practice, the other embodiment of the present invention is for those skilled in the art
It all will be readily apparent and understand.Illustrate and embodiment is regarded only as being exemplary, true scope of the invention and purport are equal
It is defined in the claims.
Claims (7)
1. a kind of method for measuring strain inducing grating deformation based on ultrasonic pulse, which is characterized in that the measurement is answered
The method of change includes the following steps：
A) overlap fibre optical sensor strain measurement system, the system comprises pumping source, the first optical fiber, a wavelength division multiplexer,
One section of optical fiber, supersonic generator and (FBG) demodulator for carrying continuous uniform grating, the optical fiber with continuous uniform grating
One end is bulbous end, and the supersonic generator is equipped with transmitting probe, and the transmitting probe passes through silicon with the bulbous end
Glue is fixed, and the bulbous end is bead made of optical fiber connector sintering, is coated with and leads between the bead and the transmitting probe
Sound is pasted, and the sound paste of leading is optoacoustic matching materials, enters optical fiber for coupled acoustic wave；The (FBG) demodulator is with described with continuous equal
The optical fiber other end of even grating connects；The optical fiber with continuous uniform grating has multistage grating, every section of raster grid
It is uniformly distributed, is spaced between the grating identical；
B) the fibre optical sensor strain measurement system is bonded with strain gauge material to be measured, record the (FBG) demodulator it is collected from
Deviate the spacing of main peak in peak；
C) relationship of the spacing of main peak with the spacing from peak deviation main peak with strain variation will be deviateed from peak described in step b)
Curve comparison obtains material strain size.
2. the method for measuring strain according to claim 1, which is characterized in that deviate main peak from peak in the step c)
Spacing is obtained with the relation curve of strain variation by calibration, and the calibration includes the following steps：
(1) optical fiber with continuous uniform grating is bonded with controllable strain gauge material；
(2) the pumping source transmitting light wave enters first optical fiber, and the supersonic generator emits described in ultrasonic wave entrance
Optical fiber with continuous uniform grating；
(3) the collected spacing for deviateing main peak from peak of record (FBG) demodulator moment t；
(4) gradually increase the strain of strain gauge material, the process of repeating said steps (2) to step (3), record (FBG) demodulator with it is described
The t collected differently strained caused spacing for deviateing main peak from peak at the time of identical in step (3)；
(5) it is fitted and deviates the spacing of main peak with the relation curve of strain variation from peak.
3. the method for measuring strain according to claim 2, which is characterized in that the ultrasonic wave described in step (2) is with vertical
Waveshape is propagated, and the wavelength of the ultrasonic wave is more than the grid length of the grating.
4. the method for measuring strain according to claim 2 or 3, which is characterized in that the ultrasonic wavelength is 1cm-
2cm。
5. the method for measuring strain according to claim 2, which is characterized in that increase the side of strain in the step (4)
Method is to stretch, bending, vibrate or squeeze.
6. the method for measuring strain according to claim 2, which is characterized in that it is described from peak deviate main peak spacing with
The relation curve of strain variation is fitted by linear fit or least square method.
7. the Optical Fiber Sensor Measurement System of measuring strain method described in a kind of claim 1, which is characterized in that the measurement system
System includes pumping source, the first optical fiber, a wavelength division multiplexer, one section of optical fiber, supersonic generator for carrying continuous uniform grating
And (FBG) demodulator；
Described optical fiber one end with continuous uniform grating is bulbous end；
The supersonic generator is equipped with transmitting probe, and the transmitting probe is fixed with the bulbous end by silica gel, described
Bulbous end is bead made of optical fiber connector sintering, is coated between the bead and the transmitting probe and leads sound paste, described to lead
Sound paste is optoacoustic matching materials, enters optical fiber, the (FBG) demodulator and the light with continuous uniform grating for coupled acoustic wave
There is multistage grating, every section of raster grid to be uniformly distributed for fine other end connection, the optical fiber with continuous uniform grating, institute
State be spaced between grating it is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610215074.6A CN105890536B (en) | 2016-04-08 | 2016-04-08 | A method of measuring strain is used for based on ultrasonic pulse induction grating deformation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610215074.6A CN105890536B (en) | 2016-04-08 | 2016-04-08 | A method of measuring strain is used for based on ultrasonic pulse induction grating deformation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105890536A CN105890536A (en) | 2016-08-24 |
| CN105890536B true CN105890536B (en) | 2018-09-28 |
Family
ID=57012799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610215074.6A Active CN105890536B (en) | 2016-04-08 | 2016-04-08 | A method of measuring strain is used for based on ultrasonic pulse induction grating deformation |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105890536B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108061522A (en) * | 2017-12-14 | 2018-05-22 | 贵州航天计量测试技术研究所 | Distribution type fiber-optic Bragg grating MISSILE LAUNCHING case strain monitoring system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5564832A (en) * | 1993-01-29 | 1996-10-15 | United Technologies Corporation | Birefringent active fiber laser sensor |
| CN101793570A (en) * | 2009-10-21 | 2010-08-04 | 南京大学 | Sensing method of optical-fiber Bragg grating laser device |
| CN103337782A (en) * | 2013-07-19 | 2013-10-02 | 北京信息科技大学 | Method for measuring strain by utilizing output longitudinal mode of short-cavity optical fiber laser |
| CN104990620A (en) * | 2015-07-03 | 2015-10-21 | 南京大学 | Fiber bragg grating array-based phase-sensitive optical time domain reflection device and method |
| CN105277271A (en) * | 2014-07-22 | 2016-01-27 | 中国石油化工股份有限公司 | Ultrasonic vibrating phase shift fiber grating sensing detection system and application thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100628472B1 (en) * | 2004-05-24 | 2006-09-26 | 한국과학기술연구원 | Raman or erbium-doped fiber laser sensing probe based on fiber Bragg gratings fabricated with few mode fibers for applications to simultaneous measurement of strain and temperature and long-distance remote sensors |
-
2016
- 2016-04-08 CN CN201610215074.6A patent/CN105890536B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5564832A (en) * | 1993-01-29 | 1996-10-15 | United Technologies Corporation | Birefringent active fiber laser sensor |
| CN101793570A (en) * | 2009-10-21 | 2010-08-04 | 南京大学 | Sensing method of optical-fiber Bragg grating laser device |
| CN103337782A (en) * | 2013-07-19 | 2013-10-02 | 北京信息科技大学 | Method for measuring strain by utilizing output longitudinal mode of short-cavity optical fiber laser |
| CN105277271A (en) * | 2014-07-22 | 2016-01-27 | 中国石油化工股份有限公司 | Ultrasonic vibrating phase shift fiber grating sensing detection system and application thereof |
| CN104990620A (en) * | 2015-07-03 | 2015-10-21 | 南京大学 | Fiber bragg grating array-based phase-sensitive optical time domain reflection device and method |
Non-Patent Citations (1)
| Title |
|---|
| 均匀光纤光栅对超声波检测的研究;黄赛风等;《电子技术与软件工程》;20140801(第15期);第57-58页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105890536A (en) | 2016-08-24 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4632551A (en) | Passive sampling interferometric sensor arrays | |
| JPS60227227A (en) | Fiber optic frequency shifter | |
| JP5196483B2 (en) | Vibration or elastic wave detector | |
| WO1979000377A1 (en) | Optical sensing apparatus and method | |
| WO2002027382A1 (en) | Optical fiber connector, wavelength varying device, pressure sensor, acceleration sensor, and optical device | |
| EP1152240A3 (en) | Ultrasonic probe and ultrasonic diagnosis apparatus using the same | |
| KR870008199A (en) | Optical Fiber Devices and Methods for Spectral Analysis and Filtering | |
| CN111007154B (en) | Flexible ultrasonic transducer, manufacturing method and all-optical ultrasonic emission and detection method | |
| CN105629185B (en) | A method of based on ultrasonic pulse induction grating deformation for measuring magnetic field | |
| CN106019478A (en) | High-sensitivity pyrometric cone coupling micro-nano optical fiber ultrasonic detection system and coupler manufacturing method thereof | |
| GB2113417A (en) | Acousto-optical fibre transducer | |
| CN105890536B (en) | A method of measuring strain is used for based on ultrasonic pulse induction grating deformation | |
| CA3158849A1 (en) | Whispering gallery mode resonators for sensing applications | |
| CN109323748A (en) | Fibre optic hydrophone and preparation method thereof based on liquid crystal Fabry-Bo Luo resonant cavity | |
| CN105806509B (en) | It is a kind of based on ultrasonic pulse induce grating deformation for the method that measures temperature | |
| CN105911023B (en) | A method of based on ultrasonic pulse induction grating deformation for measuring refractive index | |
| US20070237476A1 (en) | Lithium niobate coated optical fiber apparatus and method | |
| CN110849464B (en) | Optical fiber Fabry-Perot sound sensor based on hub-shaped vibrating diaphragm | |
| JP2009014725A5 (en) | ||
| EP4090922B1 (en) | A photonic integrated device for converting sound into a modulation of properties of light in the device | |
| JP2017207531A (en) | Microscope system | |
| WO2005040727A2 (en) | Improvements in and relating to fibre optic sensors | |
| CN214471482U (en) | Chirped long-period fiber grating sensor for measuring wind pressure | |
| CN208818171U (en) | Diaphragm type fibre optic strain sensor | |
| Shindo et al. | Reflection-Type Optical-Fiber Vibration Sensor based on a Long-period Fiber Grating Fabricated Using a Heat-Shrinkable Tube and a Screw |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |