CN108844919A - The reflection type inclined fiber grating index sensor of covering and production, measurement method - Google Patents
The reflection type inclined fiber grating index sensor of covering and production, measurement method Download PDFInfo
- Publication number
- CN108844919A CN108844919A CN201810376879.8A CN201810376879A CN108844919A CN 108844919 A CN108844919 A CN 108844919A CN 201810376879 A CN201810376879 A CN 201810376879A CN 108844919 A CN108844919 A CN 108844919A
- Authority
- CN
- China
- Prior art keywords
- fiber grating
- optical fiber
- covering
- reflection type
- light
- 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.)
- Granted
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/41—Refractivity; Phase-affecting properties, e.g. optical path length
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a kind of reflection type inclined fiber grating index sensor of covering and production, measurement method, the sensor includes light source, sensing probe and spectrum demodulating equipment, the light source and spectrum demodulating equipment are connect with sensing probe respectively by optical fiber circulator, the sensing probe includes single mode optical fiber and inclined optical fiber grating with covering reflecting mirror, the inclined optical fiber grating is connect with single mode optical fiber, and inclined optical fiber grating has the cladding mode of reverse transfers；When inclined optical fiber grating the external refractive index changes, the cladding mode light field of inclined optical fiber grating changes therewith, perceives the external refractive index variation by the variation of monitoring cladding mode optical field wavelength and intensity, realizes the measurement of refractive index.The refractometry of all -fiber high sensitivity can be achieved in the present invention, has many advantages, such as that small in size, light-weight, high sensitivity, electromagnetism interference, stability are strong, are suitble to monitored over time.
Description
Technical field
The present invention relates to a kind of index sensor, especially a kind of reflection type inclined fiber grating refractive index sensing of covering
Device and production, measurement method, belong to field of sensing technologies.
Background technique
It is well known that fiber-optic grating sensor is compared with traditional electric sensor, with low-loss, size it is small,
The advantages that light-weight, electromagnetism interference, chemical stabilization and electrical isolation.However, traditional fiber Bragg grating is to ambient refractive index
It is insensitive, it cannot achieve the Application in Sensing based on refraction index changing.Long-period grating pair environment temperature, strain and refractive index
Cross sensitivity, stability difference limit the application in actual measurement of long-period fiber grating.
Fiber core basic mode is effectively excited to fibre cladding, is generated since grating inclination angle introduces by inclined optical fiber grating
Hundreds of cladding modes with different effective refractive indexs, these cladding modes make inclined optical fiber grating to ambient refractive index and its
Sensitivity, at the same time, inclined optical fiber grating fibre core basic mode can be realized again to environment temperature and strain information measurement, therefore oblique light
The characteristic that there are fine grating many reference amounts to measure simultaneously, and it also inherits short cycle fiber grating (fiber bragg grating) knot
The stable advantage of structure has good Application in Sensing potentiality.
The cladding mode of inclined optical fiber grating excitation is reverse transfers mode, and Energy distribution can not in fibre cladding, energy
Fiber core is again returned to, is received by a detector.Traditional inclined optical fiber grating index sensor measurement is all to be swashed
Remaining core mode energy after hair.
Summary of the invention
The first purpose of this invention is the defect in order to solve the above-mentioned prior art, and it is reflection type inclined to provide a kind of covering
Fiber grating index sensor, the sensor have small in size, light-weight, high sensitivity, electromagnetism interference, stability it is strong,
The advantages that being suitble to monitored over time.
Second object of the present invention is to provide a kind of system of reflection type inclined fiber grating index sensor of covering
Make method.
Third object of the present invention is to provide a kind of based on the reflection type inclined fiber grating refractive index biography of above-mentioned covering
The measurement method of sensor
The purpose of the present invention can be reached by adopting the following technical scheme that：
The reflection type inclined fiber grating index sensor of covering, including light source, sensing probe and spectrum demodulating equipment,
The light source and spectrum demodulating equipment are connect with sensing probe respectively by optical fiber circulator, and the sensing probe includes with packet
The single mode optical fiber and inclined optical fiber grating of layer reflecting mirror, the inclined optical fiber grating are connect with single mode optical fiber, and tilt optical fiber light
Grid have the cladding mode of reverse transfers.
Further, the covering reflecting mirror is process by the reflectance coating for being plated in optic fibre end.
Further, the centre of the covering reflecting mirror be provided with can light passing circular hole.
Further, the diameter of the circular hole is 10~30 microns.
Further, the reflectivity of the reflectance coating is more than 90%.
Further, the tilt angle of the inclined optical fiber grating is 0~45 degree.
Further, the light source is wideband light source or tunable laser.
Second object of the present invention can be reached by adopting the following technical scheme that：
The production method of the reflection type inclined fiber grating index sensor of covering, the method includes：
Reflectance coating is plated in optic fibre end, and is processed into covering reflecting mirror；The middle section of covering reflecting mirror is removed；It will incline
Oblique fiber grating is connect with the single mode optical fiber with covering reflecting mirror, constitutes sensing probe；Sensing probe is passed through into fiber annular
Device is separately connected light source and spectrum demodulating equipment, constitutes the reflection type inclined fiber grating index sensor of covering.
Further, the middle section of the covering reflecting mirror is circular hole.
Third object of the present invention can be reached by adopting the following technical scheme that：
Measurement method based on the reflection type inclined fiber grating index sensor of above-mentioned covering, it is characterised in that：It is described
Method includes：
The light being emitted from light source, is transmitted in fiber core, into optical fiber circulator, first reaches covering reflecting mirror, covering
Reflecting mirror does not have reflex to the light in fibre core, and core light is incident on inclined optical fiber grating；Core light is inclined by fiber grating
It is coupled to covering, becomes the cladding mode of reverse transfers, be incident on covering；Cladding mode is reflected by covering reflecting mirror, again by inclining
Oblique fiber grating, and be inclined by fiber grating and be coupled back into fibre core, become the core mode of reverse transfers；These light pass through fiber optic loop
It is received after shape device by spectrum demodulating equipment；The evanscent field of cladding mode is distributed in outside optical fiber, when inclined optical fiber grating the external refractive index
When change, the light field of the cladding mode of inclined optical fiber grating is modulated, be reacted to spectrum demodulating equipment be spectrally wavelength and
The variation of intensity；By monitoring the optical field wavelength of cladding mode and the variation of intensity, the measurement of refractive index is realized.
The present invention has following beneficial effect compared with the existing technology：
1, the present invention by single mode optical fiber design covering reflecting mirror, and by with covering reflecting mirror single mode optical fiber with
Inclined optical fiber grating combines, and when the light in fiber core reaches covering reflecting mirror, covering reflecting mirror does not have the light in fibre core
There is reflex, core light is inclined by fiber grating and is coupled to covering, becomes the cladding mode of reverse transfers, is incident on covering, wraps
Layer mould is reflected by covering reflecting mirror, is passed through inclined optical fiber grating again, and be inclined by fiber grating and be coupled back into fibre core, is become backward
The evanscent field of the core mode of transmission, cladding mode is distributed in outside optical fiber, when inclined optical fiber grating the external refractive index changes, inclination
The cladding mode light field of fiber grating changes therewith, and the variation by monitoring cladding mode optical field wavelength and intensity perceives the external refractive index
Variation, realizes the high-sensitivity measurement of refractive index.
2, index sensor of the invention can realize all -fiber high sensitivity refractometry, have it is compact-sized, at
The advantages of this cheap, suitable monitored over time.
Detailed description of the invention
Fig. 1 is the light channel structure schematic diagram of the reflection type inclined fiber grating index sensor of covering of the invention.
Fig. 2 is the structural representation of sensing probe in the reflection type inclined fiber grating index sensor of covering of the invention
Figure.
Fig. 3 is that the output spectrum of sensing probe in the reflection type inclined fiber grating index sensor of covering of the invention shows
It is intended to.
Fig. 4 is the response of refractive index schematic diagram of the reflection type inclined fiber grating index sensor of covering of the invention.
Wherein, 1- light source, 2- spectrum demodulating equipment, 3- optical fiber circulator, 4- covering reflecting mirror, 5- inclined optical fiber grating.
Specific embodiment
Present invention will now be described in further detail with reference to the embodiments and the accompanying drawings, but embodiments of the present invention are unlimited
In this.
Embodiment 1：
As depicted in figs. 1 and 2, a kind of reflection type inclined fiber grating index sensor of covering is present embodiments provided,
The sensor includes light source 1, sensing probe and spectrum demodulating equipment 2, and light source 1 and spectrum demodulating equipment 2 pass through fiber annular
Device 3 is connect with sensing probe respectively, and sensing probe includes single mode optical fiber and inclined optical fiber grating 5 with covering reflecting mirror 4；Incline
Oblique fiber grating 5 connect with single mode optical fiber, and cladding mode of the inclined optical fiber grating 5 with reverse transfers, tilt angle for 0~
45 degree, there are refractive index sensitivity characteristics.
In the present embodiment, the light source 1 is wideband light source or tunable laser；There are three the tools of optical fiber circulator 3
Port, a port connect light source 1, and second port is sequentially connected covering reflecting mirror 4, inclined optical fiber grating 5, third end
Mouth connection spectrum demodulating equipment 2.
In the present embodiment, the covering reflecting mirror 4 is process by the high reflectance reflectance coating for being plated in optic fibre end, preferably
Ground, reflectance coating are golden film or the silverskin that reflectivity is more than 90%；The centre of covering reflecting mirror 4 is provided with circular hole, which can lead to
Light, covering reflecting mirror 4 are used for reflected light in addition to the rest part of circular hole, it is preferable that 15 microns of the diameter of circular hole, it is possible to understand that
It is that the diameter of circular hole can also other numerical value between 10~30 microns.
The manufacturing process of the reflection type inclined fiber grating index sensor of the covering of the present embodiment is as follows：
Reflectance coating is plated in optic fibre end, and is processed into covering reflecting mirror 4；By the middle section of covering reflecting mirror 4, (15 is micro-
Rice) removal；Inclined optical fiber grating 5 is connect with the single mode optical fiber with covering reflecting mirror 4, constitutes sensing probe；Sensing is visited
Head is separately connected light source 1 and spectrum demodulating equipment 2 by optical fiber circulator 3, constitutes the reflection type inclined fiber grating refraction of covering
Rate sensor.
The working principle of the reflection type inclined fiber grating index sensor of the covering of the present embodiment is as follows：
The light being emitted from light source 1, is transmitted in fiber core, into optical fiber circulator 3, first reaches covering reflecting mirror 4, by
There is no reflex to the light in fibre core in covering reflecting mirror 4, core light is incident on inclined optical fiber grating 5；Core light is inclined by
Fiber grating 5 is coupled to covering, becomes the cladding mode of reverse transfers, is incident on covering；Cladding mode is reflected by covering reflecting mirror 4,
Again pass through inclined optical fiber grating 5, and be inclined by fiber grating 5 and be coupled back into fibre core, become the core mode of reverse transfers；These
Light is received after optical fiber circulator 3 by spectrum demodulating equipment 2；The sensing probe output light demodulated by spectrum demodulating equipment 2
Spectrum and response of refractive index curve difference are as shown in Figure 3 and Figure 4, sensing probe are placed in the solution of different refractivity, due to inclining
The evanscent field of the cladding mode of oblique fiber grating 5 is distributed in outside optical fiber, when 5 the external refractive index of inclined optical fiber grating changes, covering
The light field of mould is modulated, and be reacted to spectrum demodulating equipment 2 is spectrally the variation of wavelength and intensity；By monitoring cladding mode
Optical field wavelength and intensity variation, can effectively measure the external refractive index, realize the precise measurement of refractive index.
In conclusion index sensor of the invention can realize all -fiber high sensitivity refractometry, there is structure
The advantages of compact, low in cost, suitable monitored over time.
The above, only the invention patent preferred embodiment, but the scope of protection of the patent of the present invention is not limited to
This, anyone skilled in the art is in the range disclosed in the invention patent, according to the present invention the skill of patent
Art scheme and its inventive concept are subject to equivalent substitution or change, belong to the scope of protection of the patent of the present invention.
Claims (10)
1. the reflection type inclined fiber grating index sensor of covering, it is characterised in that：Including light source, sensing probe and spectrum
Demodulating equipment, the light source and spectrum demodulating equipment are connect with sensing probe respectively by optical fiber circulator, the sensing probe
Single mode optical fiber and inclined optical fiber grating including having covering reflecting mirror, the inclined optical fiber grating are connect with single mode optical fiber, and
Inclined optical fiber grating has the cladding mode of reverse transfers.
2. the reflection type inclined fiber grating index sensor of covering according to claim 1, it is characterised in that：The packet
Layer reflecting mirror is process by the reflectance coating for being plated in optic fibre end.
3. the reflection type inclined fiber grating index sensor of covering according to claim 2, it is characterised in that：The packet
Layer reflecting mirror centre be provided with can light passing circular hole.
4. the reflection type inclined fiber grating index sensor of covering according to claim 3, it is characterised in that：The circle
The diameter in hole is 10~30 microns.
5. the reflection type inclined fiber grating index sensor of covering according to claim 2, it is characterised in that：It is described anti-
The reflectivity for penetrating film is more than 90%.
6. the reflection type inclined fiber grating index sensor of covering according to claim 1-5, feature exist
In：The tilt angle of the inclined optical fiber grating is 0~45 degree.
7. the reflection type inclined fiber grating index sensor of covering according to claim 1-5, feature exist
In：The light source is wideband light source or tunable laser.
8. the production method of the reflection type inclined fiber grating index sensor of covering, it is characterised in that：The method includes：
Reflectance coating is plated in optic fibre end, and is processed into covering reflecting mirror；The middle section of covering reflecting mirror is removed；By oblique light
Fine grating is connect with the single mode optical fiber with covering reflecting mirror, constitutes sensing probe；Sensing probe is passed through into optical fiber circulator point
Not Lian Jie light source and spectrum demodulating equipment, constitute the reflection type inclined fiber grating index sensor of covering.
9. production method according to claim 8, it is characterised in that：The middle section of the covering reflecting mirror is circular hole.
10. based on the measurement method of the reflection type inclined fiber grating index sensor of any one of the claim 1-7 covering,
It is characterized in that：The method includes：
The light being emitted from light source, is transmitted in fiber core, into optical fiber circulator, first reaches covering reflecting mirror, covering reflection
Mirror does not have reflex to the light in fibre core, and core light is incident on inclined optical fiber grating；Core light is inclined by fiber grating coupling
To covering, becomes the cladding mode of reverse transfers, be incident on covering；Cladding mode is reflected by covering reflecting mirror, passes through oblique light again
Fine grating, and be inclined by fiber grating and be coupled back into fibre core, become the core mode of reverse transfers；These light pass through optical fiber circulator
It is received afterwards by spectrum demodulating equipment；The evanscent field of cladding mode is distributed in outside optical fiber, when inclined optical fiber grating the external refractive index changes
When, the light field of the cladding mode of inclined optical fiber grating is modulated, and be reacted to spectrum demodulating equipment is spectrally wavelength and intensity
Variation；By monitoring the optical field wavelength of cladding mode and the variation of intensity, the measurement of refractive index is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810376879.8A CN108844919B (en) | 2018-04-25 | 2018-04-25 | Cladding reflection type inclined fiber grating refractive index sensor and manufacturing and measuring methods thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810376879.8A CN108844919B (en) | 2018-04-25 | 2018-04-25 | Cladding reflection type inclined fiber grating refractive index sensor and manufacturing and measuring methods thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108844919A true CN108844919A (en) | 2018-11-20 |
| CN108844919B CN108844919B (en) | 2020-11-13 |
Family
ID=64212261
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810376879.8A Active CN108844919B (en) | 2018-04-25 | 2018-04-25 | Cladding reflection type inclined fiber grating refractive index sensor and manufacturing and measuring methods thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108844919B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110342130A (en) * | 2019-06-28 | 2019-10-18 | 浙江大学 | A kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG |
| CN113125384A (en) * | 2021-03-03 | 2021-07-16 | 汕头大学医学院 | Probe, circulating tumor cell detection equipment and preparation method |
| CN113281271A (en) * | 2021-04-29 | 2021-08-20 | 暨南大学 | Biomedical detection system and method for micro-nano material modification |
| CN114964604A (en) * | 2022-06-10 | 2022-08-30 | 长春理工大学 | Optical fiber pressure sensor and manufacturing method of spiral sensing optical fiber pressure probe |
| CN116952901A (en) * | 2023-07-14 | 2023-10-27 | 西安石油大学 | Experimental device, experimental method and elongation measuring device based on inclined fiber bragg grating |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040056183A1 (en) * | 2002-09-24 | 2004-03-25 | Eggleton Benjamin J. | Wavelength monitoring optical fibers using detection in the near field |
| CN101303299A (en) * | 2008-05-30 | 2008-11-12 | 南开大学 | Air relative humidity measuring instrument based on inclined optical fiber grating |
| CN101710065A (en) * | 2009-12-02 | 2010-05-19 | 浙江大学 | Thin core optical fiber mode interferometer sensor |
| US8098999B2 (en) * | 2003-06-19 | 2012-01-17 | Intel Corporation | Multiple channel power monitor |
| CN102798457A (en) * | 2012-08-20 | 2012-11-28 | 暨南大学 | System and method for sensing VCSEL (Vertical Cavity Surface Emitting Laser) based ultrahigh-speed FBG (Fiber Bragg Grating) |
| CN203025082U (en) * | 2013-01-16 | 2013-06-26 | 中国计量学院 | Refractive index sensor based on LPG-TFBG (Long Period Grating-Tilted Fiber Bragg Grating) structure |
| CN105044030A (en) * | 2015-07-30 | 2015-11-11 | 暨南大学 | Coupling refractive index meter for evanescent field among optical fibers and detecting method of coupling refractive index meter |
| CN105758827A (en) * | 2016-05-04 | 2016-07-13 | 中国计量大学 | Protein detection fiber optic sensor based on TFBG-SPR |
| CN106802284A (en) * | 2016-12-08 | 2017-06-06 | 华中科技大学 | A kind of Fiber optic near infrared spectroscopy detecting system |
-
2018
- 2018-04-25 CN CN201810376879.8A patent/CN108844919B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040056183A1 (en) * | 2002-09-24 | 2004-03-25 | Eggleton Benjamin J. | Wavelength monitoring optical fibers using detection in the near field |
| US8098999B2 (en) * | 2003-06-19 | 2012-01-17 | Intel Corporation | Multiple channel power monitor |
| CN101303299A (en) * | 2008-05-30 | 2008-11-12 | 南开大学 | Air relative humidity measuring instrument based on inclined optical fiber grating |
| CN101710065A (en) * | 2009-12-02 | 2010-05-19 | 浙江大学 | Thin core optical fiber mode interferometer sensor |
| CN102798457A (en) * | 2012-08-20 | 2012-11-28 | 暨南大学 | System and method for sensing VCSEL (Vertical Cavity Surface Emitting Laser) based ultrahigh-speed FBG (Fiber Bragg Grating) |
| CN203025082U (en) * | 2013-01-16 | 2013-06-26 | 中国计量学院 | Refractive index sensor based on LPG-TFBG (Long Period Grating-Tilted Fiber Bragg Grating) structure |
| CN105044030A (en) * | 2015-07-30 | 2015-11-11 | 暨南大学 | Coupling refractive index meter for evanescent field among optical fibers and detecting method of coupling refractive index meter |
| CN105758827A (en) * | 2016-05-04 | 2016-07-13 | 中国计量大学 | Protein detection fiber optic sensor based on TFBG-SPR |
| CN106802284A (en) * | 2016-12-08 | 2017-06-06 | 华中科技大学 | A kind of Fiber optic near infrared spectroscopy detecting system |
Non-Patent Citations (1)
| Title |
|---|
| XUEJUN ZHANG 等: "Hydrogen peroxide and glucose concentration measurement using optical fiber grating sensors with corrodible plasmonic nanocoatings", 《BIOMEDICAL OPTICS EXPRESS》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110342130A (en) * | 2019-06-28 | 2019-10-18 | 浙江大学 | A kind of system of the array distributed monitoring fused salt storage tank leakage of thinning FBG |
| CN113125384A (en) * | 2021-03-03 | 2021-07-16 | 汕头大学医学院 | Probe, circulating tumor cell detection equipment and preparation method |
| CN113281271A (en) * | 2021-04-29 | 2021-08-20 | 暨南大学 | Biomedical detection system and method for micro-nano material modification |
| CN114964604A (en) * | 2022-06-10 | 2022-08-30 | 长春理工大学 | Optical fiber pressure sensor and manufacturing method of spiral sensing optical fiber pressure probe |
| CN114964604B (en) * | 2022-06-10 | 2023-07-18 | 长春理工大学 | Optical fiber pressure sensor and manufacturing method of spiral sensing optical fiber pressure probe |
| CN116952901A (en) * | 2023-07-14 | 2023-10-27 | 西安石油大学 | Experimental device, experimental method and elongation measuring device based on inclined fiber bragg grating |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108844919B (en) | 2020-11-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108844919A (en) | The reflection type inclined fiber grating index sensor of covering and production, measurement method | |
| US9791347B2 (en) | Method and system for non-contact optical-power measurement | |
| US8988669B2 (en) | Power monitor for optical fiber using background scattering | |
| CN104246448B (en) | Sensing system and the less fundamental mode optical fibre for this system | |
| RU2617913C2 (en) | Fibre-optic strain gauge based on compound photonic crystal plate elements, system and method for producing and use | |
| JP3821167B2 (en) | Unidirectional optical power monitor | |
| CN100367016C (en) | Fibre-optical temperature measuring device and measurement thereof | |
| CN103017687B (en) | Orthogonal polarization fiber bragg grating vector torsion sensing device and detection method thereof | |
| JP2005538361A (en) | Enhanced optical fiber sensor | |
| AU2013100784A4 (en) | An optical refractive index measuring system based on speckel correlation | |
| CN110595515B (en) | Double-parameter optical fiber sensor based on polarization maintaining optical fiber and FP (Fabry-Perot) cavity | |
| CN112414581B (en) | Temperature sensor based on multicore optic fibre | |
| EP3433575B1 (en) | Optical fibre curvature sensor and measurement device comprising said sensor | |
| CN105652378B (en) | Optical circulator | |
| CN207991682U (en) | A kind of polarization interference formula defence area type all -fiber vibrating sensor | |
| CN103852093A (en) | Fiber laser sensing system based on mode interference reflection structure | |
| CN105806511B (en) | The micro optical fiber microminiature temperature sensor of cascaded structure is bored based on ball | |
| CN110031097A (en) | A kind of all -fiber Gaussian SLED light source light spectrum planarizer | |
| CN108872150A (en) | A kind of dual wavelength gain competition apparatus for measuring refractive index | |
| CN106197741A (en) | Temperature-detecting device based on micro-nano long-period fiber grating sensor and method | |
| CN105717069B (en) | Index sensor based on the DBR laser with micro groove structure | |
| Xu et al. | Multi-parameter fiber-optic sensors based on fiber random grating | |
| CN110873701A (en) | Optical fiber humidity sensor based on Mach-Zehnder interferometer | |
| CN220525167U (en) | Temperature and humidity optical fiber sensor and temperature and humidity detection system | |
| CN104215367B (en) | Multi-dimensional stress photonic crystal fiber testing device and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |