CN105841839B - A method of utilizing optical fiber sagnac interferometer measuring temperature field - Google Patents
A method of utilizing optical fiber sagnac interferometer measuring temperature field Download PDFInfo
- Publication number
- CN105841839B CN105841839B CN201610165571.XA CN201610165571A CN105841839B CN 105841839 B CN105841839 B CN 105841839B CN 201610165571 A CN201610165571 A CN 201610165571A CN 105841839 B CN105841839 B CN 105841839B
- Authority
- CN
- China
- Prior art keywords
- optical fiber
- sagnac rings
- fiber sagnac
- temperature
- rings
- 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
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K11/00—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00
- G01K11/32—Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 using changes in transmittance, scattering or luminescence in optical fibres
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Temperature Or Quantity Of Heat (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention provides a kind of methods using optical fiber sagnac interferometer measuring temperature field, and described method includes following steps：A) cascade Sagnac interferometer measuring systems are built, the system comprises wideband light source pumping source, the first rare earth doped element optical fiber, the second rare earth doped element optical fiber, a wavelength division multiplexer, the first photo-coupler, the second photo-coupler, the first optical fiber Sagnac rings, isolator, the second optical fiber Sagnac rings, spectrometers；B) the first optical fiber Sagnac rings and the second optical fiber Sagnac rings are placed in the environment of controllable temperature, carry out temperature calibration；C) temperature in Gradual scene change, the spectrum of spectrometer collection the second optical fiber Sagnac rings output, the length of record comb spectrum movement, the relation curve that fitting comb spectrum wavelength shift varies with temperature；D) relation curve that be fitted comb spectrum wavelength shift varies with temperature is utilized to measure environment to be measured into trip temperature.
Description
Technical field
It is the present invention relates to fiber optic interferometric field, more particularly to a kind of using optical fiber sagnac interferometer measuring temperature field
Method.
Background technology
In general, the sensor of optical fiber has, compact-sized, service life is long, transmission channel sensitive to test volume mostly etc.
Advantage is widely used in the fields such as Fibre Optical Sensor, fiber optic communication, optical manufacturing.By fiber end face micro-processing technology or build
Full-fiber sensor with interference structure exports the interference spectral curve with pectination spectral pattern under pumping source effect.2011
Nian Fanlin is brave et al. to devise a kind of Mach-Zehnder interferometer based on twin-core fiber, is applied to magnetic field, temperature and dependent variable
It measures, it is about 10dBm that interference fringe, which serves as a contrast amplitude ratio, and fringe spacing is about 2nm.Two three-dB coupler systems of Zou Hui in 2013 et al.
The Mach-Zehnder interferometer of two-stage structure is constituted in conjunction with twin-core fiber at Mach-Zehnder interference system, striped lining amplitude ratio is about
30dBm.Optical fiber mach-Zehnder interferometer has the advantages such as simple in structure, fringe contrast is high, comb spectrum is intensive, is commonly used for
Sensory field of optic fibre.
However, the precision of such method measuring temperature is not very high, cannot meet the needs of some high-precision occasions.Grade
Connection Sagnac interferometer structures are simple and are easily achieved, and it is dilute in two sections of doping which by two optical fiber Sagnac rings forms welding
In earth elements optical fiber, rare earth doped optical fibre is also used as the gain media of sensor.There can be utilization to be based on therefore, it is necessary to a kind of
The system and method for cascading Sagnac interferometer accurate temperature measurements.
Invention content
The purpose of the present invention is to provide a kind of methods using optical fiber sagnac interferometer measuring temperature field, at one
Aspect, the measurement method include the following steps：
A) cascade Sagnac interferometer measuring systems are built, the system comprises wideband light source pumping source, the first doping are dilute
Earth elements optical fiber, the second rare earth doped element optical fiber, a wavelength division multiplexer, the first photo-coupler, the second photo-coupler, first
Optical fiber Sagnac rings, isolator, the second optical fiber Sagnac rings, spectrometer；
B) the first optical fiber Sagnac rings and the second optical fiber Sagnac rings are placed in the environment of controllable temperature, carry out the scale of thermometer
It is fixed；
C) temperature in Gradual scene change, the spectrum of spectrometer collection the second optical fiber Sagnac rings output, records pectination
The dynamic length of spectral shift, the relation curve that fitting comb spectrum wavelength shift varies with temperature；
D) relation curve that be fitted comb spectrum wavelength shift varies with temperature is utilized to survey environment to be measured into trip temperature
Amount.
In one aspect, the measurement method, the first optical fiber Sagnac rings include polarization maintaining optical fibre, Polarization Control
Device, the second optical fiber Sagnac rings include polarization maintaining optical fibre, Polarization Controller；The first optical fiber Sagnac rings and the first doping
Rare earth element optical fiber is connected by the first photo-coupler, and the second optical fiber Sagnac rings and the second rare earth doped element optical fiber are logical
Cross the connection of the second photo-coupler.
In one aspect, the measurement method enters the second light by the light that the first optical fiber Sagnac rings project
Fine Sagnac rings carry out secondary filter.
In one aspect, the measurement method is connected as welding mode described in the step a).
In one aspect, the method for the measurement method, the temperature of the change environment described in the step c) makes to do
Interferometer stretches or bending.
In one aspect, the measurement method, the rare earth doped element optical fiber are situated between as the gain of fibre optical sensor
Matter.
In one aspect, the measurement method, the wavelength division multiplexer couple pump light, after the coupling
Pump light enter the doped fiber.
In one aspect, the measurement method, the relation curve that the comb spectrum wavelength shift varies with temperature are logical
It crosses linear fit or least square method is fitted.
In one aspect, the measurement method, the polarization maintaining optical fibre length described in the first Sagnac rings are 1.5m-
2.5m, the polarization maintaining optical fibre length described in the 2nd Sagnac rings are 0.5m-1.5m.
On the other hand, the present invention also provides a kind of cascade Sagnac interference for the measuring temperature field method
Instrument measuring system, which is characterized in that the measuring system includes sequentially connected wideband light source pumping source, a wavelength-division multiplex
Device, the first rare earth doped element optical fiber, the first photo-coupler, the first optical fiber Sagnac rings, isolator, the second photo-coupler,
Two optical fiber Sagnac rings, the second rare earth doped element optical fiber, spectrometer；The first optical fiber Sagnac rings include polarization maintaining optical fibre,
Polarization Controller, the second optical fiber Sagnac rings include polarization maintaining optical fibre, Polarization Controller；The first optical fiber Sagnac rings with
First rare earth doped element optical fiber is connected by the first photo-coupler, the second optical fiber Sagnac rings and second rare earth doped yuan
Plain optical fiber is connected by the second photo-coupler.
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 present invention cascade Sagnac interferometer temperature measurement systems；
Fig. 2 shows the operation principles of cascade Sagnac rings of the invention；
Fig. 3 shows the oscillogram that comb spectrum wavelength shift of the present invention varies with temperature；
Fig. 4 shows the curve that comb spectrum wavelength shift of the present invention varies with temperature.
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 using optical fiber sagnac interferometer measuring temperature field, in the present embodiment, such as
Sagnac interferometer temperature measurement systems, the cascade Sagnac interferometer measuring systems are cascaded shown in Fig. 1, including are connected successively
101, wavelength division multiplexers 102 of the wideband light source pumping source connect, the first rare earth doped element optical fiber 103, the first optical fiber
Sagnac rings 104, isolator 105, the second optical fiber Sagnac rings 106, the second rare earth doped element optical fiber 107, spectrometer 108；
It includes polarization maintaining optical fibre 109a, Polarization Controller 110a, the second optical fiber to cascade Sagnac interferometer the first optical fiber Sagnac rings 104
Sagnac rings 106 include polarization maintaining optical fibre 109b, Polarization Controller 110b.First optical fiber Sagnac rings 104 and first rare earth doped
Element optical fiber 103 is connected by the first photo-coupler 111, the second optical fiber Sagnac rings 106 and the second rare earth doped element optical fiber
107 are connected by the second photo-coupler 112.In first optical fiber Sagnac rings 104, polarization maintaining optical fibre 109a length is 1.5m-2.5m,
It is preferred that 2m；In second optical fiber Sagnac rings 106, polarization maintaining optical fibre 109b length is 0.5m-1.5m, preferably 1m.Wideband light source pumps
The light that source 101 is sent out synthesizes by wavelength division multiplexer 102 with the optocoupler in optical fiber a branch of, passes through the first rare earth doped element optical fiber
Enter in the first optical fiber Sagnac rings 104 after 103 and be divided into two-beam and interfered, the light after interference passes through the first photo-coupler
It is entered after 111 and is divided into two-beam in second optical fiber Sagnac rings 106 and is interfered, the light after interference passes through the second photo-coupler
Enter the second rare earth doped element optical fiber 107 after 112, optical signal is acquired by spectrometer 108.First optical fiber Sagnac rings 104
The isolator 105 arranged between the second optical fiber Sagnac rings 106 ensure that the propagation of light in one direction.
Principle of the light in transmission process is detailed below：
The operation principle of cascade Sagnac rings shown in Fig. 2, light enter the first light by the first rare earth doped element optical fiber 203
Light in fine Sagnac rings 204 is divided into two beams.Polarization Controller 210a and polarization maintaining optical fibre in the first optical fiber Sagnac rings
209a ensures that linear polarization is constant.The transmissivity of first optical fiber Sagnac rings 204 can be expressed as：
Wherein θ 1 is through the polarization angle after polarization maintaining optical fibre, and θ 2 is through the polarization angle after Polarization Controller, and β is
The propagation constant of Sagnac rings, L are the length of polarization maintaining optical fibre, and Δ n is birefringence.By the first optical fiber Sagnac rings
204 light projected carry out secondary filter, Polarization Controller by entering the second optical fiber Sagnac rings 206 after the first coupler 211
210b and polarization maintaining optical fibre 209b ensures that linear polarization is constant, and intensity in transmission Iout is expressed as:
The π L Δ n/ λ of β=2, (3)
Wherein t1 and t2 is the transmissivity of Sagnac rings, and the light of injection is coupled by the second coupler 212, through the second doping
The comb spectrum exported by spectrometer collection after rare earth element optical fiber 207.First optical fiber Sagnac rings 204 and the second optical fiber Sagnac
The isolator 205 arranged between ring 206 ensure that the propagation of light in one direction.In the comb spectrum of acquisition, the wave of adjacent peak
Long interval is related with centre wavelength, polarization state, fiber lengths.Sensing testing is carried out using the comb spectrum, when interferometer is by outer
When boundary influences that two-arm optical path difference is caused to change, interference comb spectrum changes, and interference fringe generates movement.
The method that optical fiber sagnac interferometer measuring temperature field is utilized in the present embodiment, specific steps are detailed below
It is as follows：The cascade Sagnac interferometer measuring systems are built, the system comprises the width that the mode for passing sequentially through welding connects
101, wavelength division multiplexers 102 of band light source pumping source, the first rare earth doped element optical fiber 103, the first optical fiber Sagnac rings
104, isolator 105, the second optical fiber Sagnac rings 106, the second rare earth doped element optical fiber 107, spectrometer 108；Cascade
Sagnac interferometers the first optical fiber Sagnac rings 104 include polarization maintaining optical fibre 109a, Polarization Controller 110a, the second optical fiber Sagnac
Ring 106 includes polarization maintaining optical fibre 109b, Polarization Controller 110b.First optical fiber Sagnac rings 104 and the first rare earth doped element light
Fibre 103 is connected by the first photo-coupler 111, and the second optical fiber Sagnac rings 106 pass through with the second rare earth doped element optical fiber 107
Second photo-coupler 112 connects.First optical fiber Sagnac rings 104 and the second optical fiber Sagnac rings 106 are placed in controllable temperature
In environment：Epoxy resin (Epoxy Resin) or acrylate are chosen as adhesive, with adhesive means respectively by the first optical fiber
Sagnac rings 104 and the second optical fiber Sagnac rings 106 are fixed on the surface of material 113, and the material fixed is placed in temperature
In the environment of 114 top controllable temperature of controller, temperature calibration is carried out.Change the item of environment temperature by temperature controller 114
Interferometer is stretched or is bent under part, it is preferable that causes interferometer polarization state to occur accordingly by increasing temperature in the present embodiment
So as to cause comb spectrum red shift or blue shift occur for variation, and with the increase of tensile elongation, i.e., axial microstress increases, comb filtering
The transmission spectrum of device is moved to shortwave direction.Spectrometer 108 acquires the comb spectrum of the second optical fiber Sagnac rings 106 output, such as Fig. 3 institutes
Show the oscillogram that comb spectrum wavelength shift varies with temperature, the length of record comb spectrum movement, fitting comb spectrum wavelength shift with
Linear Quasi can be used in the curve of temperature change, the curve that comb spectrum wavelength shift as shown in Figure 4 varies with temperature, curve matching
It closes, as shown in formula 5.
Y=ax+b (5)
Least square fitting can also be used in curve matching, and matched curve can be released by following equatioies (6) and (7).
Solving equations find out a0And a1, so that it may construct the approximating function for meeting square approach condition.
F (x)=a0+a1x (8)。
It utilizes be fitted comb spectrum wavelength shift to vary with temperature curve and treats environment into trip temperature measurement.
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 (9)
1. a method of utilizing optical fiber sagnac interferometer measuring temperature field, which is characterized in that the method includes as follows
Step：
A) build cascade Sagnac interferometer measuring systems, the system comprises sequentially connected wideband light source pumping source, one
Wavelength division multiplexer, the first rare earth doped element optical fiber, the first optical fiber Sagnac rings, isolator, the second optical fiber Sagnac rings, second
Rare earth doped element optical fiber, spectrometer；It includes polarization maintaining optical fibre, Polarization Control to cascade Sagnac interferometer the first optical fiber Sagnac rings
Device, the second optical fiber Sagnac rings include polarization maintaining optical fibre, Polarization Controller；First optical fiber Sagnac rings and the first rare earth doped element
Optical fiber is connected by the first photo-coupler, and the second optical fiber Sagnac rings and the second rare earth doped element optical fiber pass through the second optical coupling
Device connects；
B) by the first optical fiber Sagnac rings and the second optical fiber Sagnac rings by epoxy resin or acrylate be used as adhesive with
Adhesive means are separately fixed on the surface of material, and the material fixed is placed in the environment of controllable temperature above temperature controller
In, carry out temperature calibration；
C) temperature in Gradual scene change, the spectrum of spectrometer collection the second optical fiber Sagnac rings output, records pectination spectral shift
Dynamic length, the relation curve that fitting comb spectrum wavelength shift varies with temperature；
D) relation curve that be fitted comb spectrum wavelength shift varies with temperature is utilized to measure environment to be measured into trip temperature.
2. the method for measuring temperature field according to claim 1, which is characterized in that pass through the first optical fiber Sagnac rings
The light of injection enters the second optical fiber Sagnac rings and carries out secondary filter.
3. the method for measuring temperature field according to claim 1, which is characterized in that be connected as welding side described in step a)
Formula.
4. the method for measuring temperature field according to claim 1, which is characterized in that the change environment described in step c)
The method of temperature makes interferometer stretch or be bent.
5. the method for measuring temperature field according to claim 1, which is characterized in that the first rare earth doped element optical fiber
Gain media with the described second rare earth doped element optical fiber as fibre optical sensor.
6. the method for measuring temperature field according to claim 1, which is characterized in that the wavelength division multiplexer is to pump light
It is coupled, the pump light after the coupling enters the doped fiber.
7. the method for measuring temperature field according to claim 1, which is characterized in that the comb spectrum wavelength shift is with temperature
The relation curve of degree variation is fitted by linear fit or least square method.
8. the method for measuring temperature field according to claim 1, which is characterized in that institute in the first optical fiber Sagnac rings
The polarization maintaining optical fibre length stated is 1.5m-2.5m, and the polarization maintaining optical fibre length described in the second optical fiber Sagnac rings is 0.5m-
1.5m。
9. a kind of for utilizing the cascade Sagnac of the method for optical fiber sagnac interferometer measuring temperature field described in claim 1
Interferometer measuring system, which is characterized in that the measuring system includes that sequentially connected wideband light source pumping source, wavelength-division are multiple
With device, the first rare earth doped element optical fiber, the first photo-coupler, the first optical fiber Sagnac rings, isolator, the second photo-coupler,
Second optical fiber Sagnac rings, the second rare earth doped element optical fiber, spectrometer；The first optical fiber Sagnac rings include polarization-maintaining light
Fine, Polarization Controller, the second optical fiber Sagnac rings include polarization maintaining optical fibre, Polarization Controller；The first optical fiber Sagnac
Ring is connect with the first rare earth doped element optical fiber by the first photo-coupler, and the second optical fiber Sagnac rings and the second doping are dilute
Earth elements optical fiber is connected by the second photo-coupler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610165571.XA CN105841839B (en) | 2016-03-22 | 2016-03-22 | A method of utilizing optical fiber sagnac interferometer measuring temperature field |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610165571.XA CN105841839B (en) | 2016-03-22 | 2016-03-22 | A method of utilizing optical fiber sagnac interferometer measuring temperature field |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105841839A CN105841839A (en) | 2016-08-10 |
| CN105841839B true CN105841839B (en) | 2018-09-21 |
Family
ID=56587766
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610165571.XA Active CN105841839B (en) | 2016-03-22 | 2016-03-22 | A method of utilizing optical fiber sagnac interferometer measuring temperature field |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105841839B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107271077A (en) * | 2017-07-13 | 2017-10-20 | 燕山大学 | A kind of insensitive temperature sensor of pulling force based on Sagnac principle |
| CN112816096B (en) * | 2021-03-08 | 2024-06-07 | 杭州电子科技大学 | Cascade interferometer optical fiber temperature sensor based on vernier effect |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553158A (en) * | 2003-11-10 | 2004-12-08 | �������պ����ѧ | Optical fibre temperature sensing method and sensor based on SAGNAC interferometer |
| CN101639387A (en) * | 2009-09-11 | 2010-02-03 | 北京航空航天大学 | Optical fiber temperature sensor for detection based on wavelength corresponding to extreme value and temperature sensing method |
| CN102183318A (en) * | 2011-03-08 | 2011-09-14 | 上海交通大学 | Two-in-parallel high birefringence optical fiber sagnac interference ring multi-parameter sensor |
| CN102412499A (en) * | 2011-09-22 | 2012-04-11 | 杭州电子科技大学 | Adjustable ring-shaped cavity erbium-doped optical-fiber multi-wavelength laser based on cascade HiBi optical fibers and Sagnac rings |
| CN102680133A (en) * | 2012-04-11 | 2012-09-19 | 杭州光络科技有限公司 | Liquid filling type fiber temperature sensor |
| CN103336324A (en) * | 2013-06-28 | 2013-10-02 | 华中科技大学 | Interferential comb filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB9821956D0 (en) * | 1998-10-09 | 1998-12-02 | Univ Southampton | Novel system to detect disturbance in optical fibres & cables |
| US6188050B1 (en) * | 1999-03-25 | 2001-02-13 | Karta Technologies, Inc. | System and method for controlling process temperatures for a semi-conductor wafer |
-
2016
- 2016-03-22 CN CN201610165571.XA patent/CN105841839B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1553158A (en) * | 2003-11-10 | 2004-12-08 | �������պ����ѧ | Optical fibre temperature sensing method and sensor based on SAGNAC interferometer |
| CN101639387A (en) * | 2009-09-11 | 2010-02-03 | 北京航空航天大学 | Optical fiber temperature sensor for detection based on wavelength corresponding to extreme value and temperature sensing method |
| CN102183318A (en) * | 2011-03-08 | 2011-09-14 | 上海交通大学 | Two-in-parallel high birefringence optical fiber sagnac interference ring multi-parameter sensor |
| CN102412499A (en) * | 2011-09-22 | 2012-04-11 | 杭州电子科技大学 | Adjustable ring-shaped cavity erbium-doped optical-fiber multi-wavelength laser based on cascade HiBi optical fibers and Sagnac rings |
| CN102680133A (en) * | 2012-04-11 | 2012-09-19 | 杭州光络科技有限公司 | Liquid filling type fiber temperature sensor |
| CN103336324A (en) * | 2013-06-28 | 2013-10-02 | 华中科技大学 | Interferential comb filter |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105841839A (en) | 2016-08-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107024236B (en) | F-P/FBG optical fiber sensor demodulation system | |
| CN201476800U (en) | High-speed multi-channel fiber grating sensor demodulating system based on AWG | |
| CN103278185B (en) | Cavity ring-down fiber grating sensing demodulating device based on calibrated fiber grating | |
| WO1998053277A1 (en) | Distributed sensing system | |
| JP5322238B2 (en) | Physical quantity measuring device | |
| WO2011091735A1 (en) | Optical sensor based on broadband light source and cascaded optical waveguide filter | |
| Su et al. | A novel fiber Bragg grating interrogating sensor system based on AWG demultiplexing | |
| CN102269573A (en) | Quasi-distributed composite structure strain and temperature detection system | |
| CN105928469A (en) | High-sensitivity fiber curvature sensor capable of discriminating bending direction and free of cross temperature sensitivity | |
| CN103697922A (en) | High-speed demodulation system of optical fiber F-P cavity sensor | |
| CN105841839B (en) | A method of utilizing optical fiber sagnac interferometer measuring temperature field | |
| CN111811554A (en) | Optical cavity ring-down-based large-range high-precision fiber grating sensing method and device | |
| CN105866711B (en) | A kind of method that magnetic field is measured using optical fiber sagnac interferometer | |
| CN101290248A (en) | Single-mode infra-red wavemeter based on Mach-Zehnder Interferometer filtering principle | |
| CN103389172B (en) | Based on the temperature sensing method of long-period gratings demodulation ordinary optic fibre grating | |
| CN206709787U (en) | A kind of double chirp gratings strain demodulating system based on piezoelectric ceramics | |
| CN105784641B (en) | A kind of refractive index measurement method based on cascade Sagnac interferometer | |
| CN105823429B (en) | A method of it is measured and is strained using optical fiber sagnac interferometer | |
| CN106197742A (en) | A kind of method utilizing fiber core mismatch interference structure to measure temperature | |
| Zheng et al. | Fast and simple interrogation of extrinsic Fabry–Perot interferometer sensor based on dual-wavelength intensity ratio | |
| CN106403833A (en) | Method utilizing fiber core mismatch interference structure to measure strain | |
| JP3925202B2 (en) | High speed wavelength detector | |
| CN106197741B (en) | Temperature-detecting device based on micro-nano long-period fiber grating sensor and method | |
| Ni et al. | A high efficient method for demodulation of FBG sensors | |
| JP2003270041A (en) | Apparatus for high-speed detection of wavelength |
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 |