CN109799015A - Intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre - Google Patents
Intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre Download PDFInfo
- Publication number
- CN109799015A CN109799015A CN201910093444.7A CN201910093444A CN109799015A CN 109799015 A CN109799015 A CN 109799015A CN 201910093444 A CN201910093444 A CN 201910093444A CN 109799015 A CN109799015 A CN 109799015A
- Authority
- CN
- China
- Prior art keywords
- protection shell
- fiber optic
- optic protection
- optical fiber
- single mode
- 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.)
- Pending
Links
Landscapes
- Optical Transform (AREA)
Abstract
A kind of intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre, spring is provided between first fiber optic protection shell and the second fiber optic protection shell, first fiber optic protection shell and the second fiber optic protection shell and spring is linked together and material is identical, first single mode optical fiber one end is inserted into blend compounds in the first fiber optic protection shell and fixes, second single mode optical fiber one end sequentially passes through the second fiber optic protection shell and spring extend into the first fiber optic protection shell the first single mode optical fiber between that there are gap formation FP chamber a, second single mode optical fiber other end blend compounds concordant with the second fiber optic protection shell end face are fixed, positioned at weak chirp grating is carved in spring region on the second single mode optical fiber.The present invention has the advantages that small in size, fast response time, high sensitivity.
Description
Technical field
The invention belongs to dynamometry technical fields, and in particular to a kind of intensity modulated based on the weak chirp grating of outstanding core fibre
Microstress sensor.
Background technique
Optical fiber stress sensor is widely applied sensor type in the world in recent years, has many electric transducers can not
The advantages of analogy, if do not influenced by electromagnetic field and external environment variation, high sensitivity, be can be achieved small in size, good insulating
Distribution measuring etc. is widely used to petroleum, chemical industry, traffic, energy, metallurgy, medicine, medicine, military project, food, nuclear industry etc.
Field.Optical fiber stress sensor is to realize long-term and real-time online monitoring structural health conditions Primary Components, for ensureing that large size is set
Safety, the pernicious and catastrophic failure of prevention and treatment applied are extremely important.
Traditional tension sensor is difficult to improve very big displacement model using optical fibre Bragg optical grating strain as measurement means
It encloses, is limited by the strain range of the strength fibers grating of optical fiber itself in addition less than 10000 microstrains, is extremely difficult to high measurement model
The requirement enclosed.The FP chamber of traditional tension sensor demodulates, and the method for use intensity demodulation cannot be demodulated directly by peak strength
The amount to be measured needs to pay close attention to two numerical value of Free Spectral Range and extinction ratio simultaneously, and needs higher sensitivity, it is desirable that surveys
The slope of curve for obtaining spectrum is higher, excessively high for technique requirement, and chamber length cannot be too long, and measurable range is also accordingly reduced.
Summary of the invention
Technical problem to be solved by the present invention lies in provide a kind of small in size, fast response time, high sensitivity based on
The intensity modulated microstress sensor of the outstanding weak chirp grating of core fibre.
Solving technical solution used by above-mentioned technical problem is: between the first fiber optic protection shell and the second fiber optic protection shell
It is provided with spring, the first fiber optic protection shell and the second fiber optic protection shell and spring is linked together and material is identical, the first single-mode optics
Fine one end is inserted into blend compounds in the first fiber optic protection shell and fixes, and second single mode optical fiber one end sequentially passes through the second fiber optic protection shell
And spring extend into the first fiber optic protection shell between the first single mode optical fiber there are gap formed FP chamber a, the second single mode optical fiber
Other end blend compounds concordant with the second fiber optic protection shell end face are fixed, positioned at being carved with weak Zhou in spring region on the second single mode optical fiber
It sings grating.
As a kind of perferred technical scheme, there is the end welding of the first single mode optical fiber in the first fiber optic protection shell
Multimode fibre, there are gaps to form FP chamber a between the other end of multimode fibre and second single mode optical fiber one end.
As a kind of perferred technical scheme, the length of the multimode fibre is 200~400um.
As a kind of perferred technical scheme, the FP chamber a length is 50~300um.
As a kind of perferred technical scheme, the first fiber optic protection shell is that diameter is identical with the second fiber optic protection shell
Its center of cylindrical body be machined with the mounting hole that diameter is 200~300um, spring outer diameter is straight with the first fiber optic protection shell
Diameter is mutually all 5~30mm, and spring line footpath is 0.1~1mm, number of active coils is 4~30 circles, bracing ring number is 2 circles, length is
10~30mm.
As a kind of perferred technical scheme, the weak chirp grating grid region length is 6~10mm, weak chirp grating grid
Area and to extend into the distance between second single mode optical fiber end in the first fiber optic protection shell be 1~10mm.
As a kind of perferred technical scheme, the material of the first fiber optic protection shell is resin.
Beneficial effects of the present invention are as follows:
The present invention changes FP chamber using spring structure is arranged between the first fiber optic protection shell and the second fiber optic protection shell
Chamber is long, the chamber long variable range of 3mm is provided under the premise of non-stretched cloth weak chirp grating, so that the measurement range of sensor is big
It is big to be promoted, while using the spring of different coefficient of elasticity, stress test range can be changed according to different demands；The present invention first
Single mode optical fiber end is provided with multimode fibre, and light is by multimode fibre incidence, and since multimode fibre core diameter is bigger, control is not
Same multimode fibre length can effectively be such that light focuses at axis of the present invention, and light is made preferably to be coupled into the i.e. weak Zhou in sensing unit
It sings in grating grid region, increases the intensity for being coupled to light in the second single mode optical fiber；It, can be by luminous intensity using weak chirp grating optical fiber
Accurate modulation to weak chirp grating central wavelength measures, while avoiding the Strength Changes of remaining wavelength light to measurement precision
Influence, play filter action；Demodulation mode of the present invention is energy demodulation, and compared with traditional Wavelength demodulation, demodulation is at low cost,
Temperature crosstalk is small, and sensor-based system is built simpler；Compared with the adhesive structure of traditional strain transducer, strain measurement range is improved
To 0~30000 μ ε；Production of the invention has high duplication, integration, has the potentiality of batch production and commercialization.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the embodiment of the present invention 1.
Fig. 2 is the structural schematic diagram of the embodiment of the present invention 4.
Fig. 3 is central wavelength reflectance spectrum situation of change nearby.
Fig. 4 is spectrum Fourier transformation spectrogram.
Fig. 5 sensor spectrum peak energy is with strain variation.
Wherein: the first fiber optic protection shell 1；First single mode optical fiber 2；Spring 3；Second fiber optic protection shell 4；Second single mode optical fiber
5；Multimode fibre 6；
Specific embodiment
The present invention is described in more detail with reference to the accompanying drawings and examples, but the present invention is not limited to following embodiment party
Formula.
Embodiment 1
In Fig. 1, the present embodiment based on the intensity modulated microstress sensor of the weak chirp grating of outstanding core fibre by first
Fiber optic protection shell 1, the first single mode optical fiber 2, spring 3, the second fiber optic protection shell 4, the second single mode optical fiber 5 connect and compose.
First fiber optic protection shell 1, spring 3, the second fiber optic protection shell 4 are linked together and material is resin, the first optical fiber
Protective shell 1 and the second fiber optic protection shell 4 are that identical its center of cylindrical body of diameter is machined with the installation that diameter is 250um
The diameter of hole, 3 outer diameter of spring and the first fiber optic protection shell 1 is mutually all 20mm, and 3 line footpath of spring is 0.5mm, number of active coils 20
Circle, bracing ring number are 2,3 length of spring is 20mm, and 2 outer diameter of the first single mode optical fiber is 125um, and one end of the first single mode optical fiber 2 is inserted
Enter into the first fiber optic protection shell 1 blend compounds to fix, 5 outer diameter of the second single mode optical fiber be 125um, 5 one end of the second single mode optical fiber according to
It is secondary across the second fiber optic protection shell 4 and spring 3 extend into the first fiber optic protection shell 1 the first single mode optical fiber 2 there are
It is 150um that gap, which forms FP chamber a, FP chamber a length, and 5 other end of the second single mode optical fiber is concordant with 4 end face of the second fiber optic protection shell to be used in combination
Glue is fixed, and weak chirp grating is carved on the second single mode optical fiber 5 in 3 region of spring, and weak chirp grating grid region length is 8mm,
Weak chirp grating grid region and the distance between 5 end of the second single mode optical fiber extending into the first fiber optic protection shell 1 are 5mm.
The end face of the end face and the second single mode optical fiber 5 that are located at first single mode optical fiber 2 at the both ends FP chamber a in the present invention is two
Reflecting surface makes the light and the second single mode optical fiber of the end face reflection of the first single mode optical fiber 2 due to the air gap between two reflectings surface
There are phase differences between the light of 5 end face reflection, interference are formed, to only exist in weak chirp grating grid on the second single mode optical fiber 5
The light of district center wavelength can be gone back to the end face of the first single mode optical fiber 2 by 5 end face reflection of the second single mode optical fiber, when tensile stress acts on
When both ends of the present invention, 3rd area of spring is stretched by stress, and FP chamber a chamber length changes, and causes to be coupled into the second single mode
Optical fiber 5 simultaneously changes in the luminous intensity of weak chirp grating central wavelength, cooperates spectral sidebands filtering technique, can visit in real time
Survey stress signal.It is set as spring 3 between first fiber optic protection shell 1 and the second fiber optic protection shell 4 of the invention, so that the survey of stress
It measures range to increase, 3 material of spring for selecting stiffness factor different can satisfy the requirement of different stress range abilities；Demodulation mode
For energy demodulation, compared with traditional Wavelength demodulation, demodulation is at low cost, and temperature crosstalk is small, and sensor-based system is built simpler；With biography
The adhesive structure of system strain transducer is compared, and strain measurement range is improved to 0~30000 μ ε；Production of the invention has Gao Chong
Renaturation, integration have the potentiality of batch production and commercialization.
Embodiment 2
In the present embodiment, the first fiber optic protection shell 1, spring 3, the second fiber optic protection shell 4 is linked together and material is
Resin, the first fiber optic protection shell 1 and the second fiber optic protection shell 4 are that identical its center of cylindrical body of diameter is machined with diameter and is
The diameter of the mounting hole of 200um, 3 outer diameter of spring and the first fiber optic protection shell 1 is mutually all 5mm, and 3 line footpath of spring is 0.1mm, effectively
Circle number is 4 circles, bracing ring number is 2,3 length of spring is 10mm, and 2 outer diameter of the first single mode optical fiber is 125um, the first single mode optical fiber 2
One end be inserted into blend compounds in the first fiber optic protection shell 1 and fix, 5 outer diameter of the second single mode optical fiber is 125um, the second single mode optical fiber
5 one end sequentially pass through the second fiber optic protection shell 4 and spring 3 is extend into the first fiber optic protection shell 1 between the first single mode optical fiber 2
Forming FP chamber a, FP chamber a length there are gap is 50um, and 5 other end of the second single mode optical fiber and 4 end face of the second fiber optic protection shell are flat
Neat blend compounds are fixed, and weak chirp grating, weak chirp grating grid region length are carved on the second single mode optical fiber 5 in 3 region of spring
For 6mm, weak chirp grating grid region is with the distance between 5 end of the second single mode optical fiber in the first fiber optic protection shell 1 is extend into
1mm.The connection relationship of other components and components is same as Example 1.
Embodiment 3
In the present embodiment, the first fiber optic protection shell 1, spring 3, the second fiber optic protection shell 4 is linked together and material is
Resin, the first fiber optic protection shell 1 and the second fiber optic protection shell 4 are that identical its center of cylindrical body of diameter is machined with diameter and is
The diameter of the mounting hole of 300um, 3 outer diameter of spring and the first fiber optic protection shell 1 is mutually all 30mm, and 3 line footpath of spring is 1mm, effectively
Circle number is 30 circles, bracing ring number is 2,3 length of spring is 30mm, and 2 outer diameter of the first single mode optical fiber is 125um, the first single mode optical fiber 2
One end be inserted into blend compounds in the first fiber optic protection shell 1 and fix, 5 outer diameter of the second single mode optical fiber is 125um, the second single mode optical fiber
5 one end sequentially pass through the second fiber optic protection shell 4 and spring 3 is extend into the first fiber optic protection shell 1 between the first single mode optical fiber 2
Forming FP chamber a, FP chamber a length there are gap is 300um, and 5 other end of the second single mode optical fiber and 4 end face of the second fiber optic protection shell are flat
Neat blend compounds are fixed, and weak chirp grating, weak chirp grating grid region length are carved on the second single mode optical fiber 5 in 3 region of spring
For 10mm, weak chirp grating grid region is with the distance between 5 end of the second single mode optical fiber in the first fiber optic protection shell 1 is extend into
10mm.The connection relationship of other components and components is same as Example 1.
Embodiment 4
In above embodiments 1~3, the intensity modulated based on the weak chirp grating of outstanding core fibre such as Fig. 2, the present embodiment is micro-
Strain gauge is by the first fiber optic protection shell 1, the first single mode optical fiber 2, spring 3, the second fiber optic protection shell 4, the second single mode optical fiber
5, multimode fibre 6 connects and composes.
First single mode optical fiber, 2 one end end welding has multimode fibre 6, and the diameter of multimode fibre 6 is 150um, length is
300um, length may be 200um, or and 400um, the end are inserted into blend compounds in the first fiber optic protection shell 1 and fix,
Second single mode optical fiber, 5 one end sequentially passes through the second fiber optic protection shell 4 and spring 3 is extend into the first fiber optic protection shell 1 and multimode
There are gaps to form FP chamber a between the other end of optical fiber 6.The connection relationship of other components and components and corresponding embodiment
It is identical.
In the present embodiment, light is incident by multimode fibre 6, since 6 core diameter of multimode fibre is bigger, controls different more
6 length of mode fiber can effectively be such that light focuses at axis of the present invention, and light is made preferably to be coupled into the i.e. weak chirped light in sensing unit
In grid grid region, the intensity for being coupled to light in the second single mode optical fiber 5 is increased；It, can be accurate by intensity using weak chirp grating optical fiber
Modulation to weak chirp grating central wavelength measures, while avoiding shadow of the Strength Changes to measurement precision of remaining wavelength light
It rings, plays filter action.
Tensile stress test has been carried out in fact to verify beneficial effects of the present invention inventor with the technical solution of embodiment 4
It tests.
The test macro of this test includes displacement platform, fibre holder, (FBG) demodulator, and the present invention is installed by fibre holder
On displacement platform, the first single mode optical fiber 2 of the invention accesses (FBG) demodulator, and laser is exported from (FBG) demodulator, imports in the present invention, simultaneously
Reflected light signal of the present invention is transferred in (FBG) demodulator, and output is to computer after demodulated instrument demodulation, when optical fiber is by stress
When, FP chamber a chamber length changes, and reflection spectral intensity is caused to change.
Test result
Pulling stiffness factor from initial position is the spring 3 of 5N/mm from 0 to 1.5mm, records a data every 0.1mm,
I.e. range of strain is 0~30000 μ ε, and reflectance spectrum situation of change is as shown in figure 3, can from figure near obtained central wavelength
Sensor resonance spectrum wavelength is held essentially constant out, but resonance spectrum intensity is gradually reduced with strain increase；By spectrum in Fig. 3
Variation is converted by Fourier algorithm to frequency spectrum, can get single resonance spectrum with strain variation, as shown in figure 4, can from figure
To find out, as dependent variable increases, spectrum energy gradually weakens；The spectrum peak intensity for recording differently strained point, such as Fig. 5 institute
Show, as can be seen from Fig., spectrum peak intensity is with strain linear change, and Linear Quasi is right > 99.6%.Measurement result shows this
The high-sensitivity measurement of big 0~30000 μ ε of range of strain can be achieved in invention.
Claims (7)
1. a kind of intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre, it is characterised in that: the first optical fiber is protected
It is provided with spring (3) between protective case (1) and the second fiber optic protection shell (4), the first fiber optic protection shell (1) and the second fiber optic protection shell
(4) and spring (3) is linked together and material is identical, and the first single mode optical fiber (2) one end is inserted into the first fiber optic protection shell (1) simultaneously
It is fixed with glue, the second single mode optical fiber (5) one end sequentially passes through the second fiber optic protection shell (4) and spring (3) extend into the first optical fiber
There are gap formation FP chamber (a) the first single mode optical fiber (2) between in protective shell (1), the second single mode optical fiber (5) other end and the
The two concordant blend compounds in fiber optic protection shell (4) end face are fixed, and are located in spring (3) region and are carved with weak Zhou on the second single mode optical fiber (5)
It sings grating.
2. the intensity modulated microstress sensor according to claim 1 based on the weak chirp grating of outstanding core fibre, feature
Be: the end welding of the first single mode optical fiber (2) has multimode fibre (6), multimode fibre in the first fiber optic protection shell (1)
(6) there are gaps to form FP chamber (a) between the other end and the second single mode optical fiber (5) one end.
3. the intensity modulated microstress sensor according to claim 2 based on the weak chirp grating of outstanding core fibre, feature
Be: the length of the multimode fibre (6) is 200~400um.
4. the intensity modulated microstress sensor according to claim 1 or 2 based on the weak chirp grating of outstanding core fibre, special
Sign is: FP chamber (a) length is 50~300um.
5. the intensity modulated microstress sensor according to claim 1 or 2 based on the weak chirp grating of outstanding core fibre, special
Sign is: the first fiber optic protection shell (1) and the second fiber optic protection shell (4) are identical its center of cylindrical body of diameter
It is machined with the mounting hole that diameter is 200~300um, the diameter of spring (3) outer diameter and the first fiber optic protection shell (1) is mutually all 5~
30mm, 3 line footpath of spring is 0.1~1mm, number of active coils be 4~30 circle, bracing ring number be 2 circles, spring (3) length be 10~
30mm。
6. the intensity modulated microstress sensor according to claim 1 or 2 based on the weak chirp grating of outstanding core fibre, special
Sign is: the weak chirp grating grid region length is 6~10mm, weak chirp grating grid region and extend into the first fiber optic protection shell
(1) the distance between the second single mode optical fiber (5) end is 1~10mm in.
7. the intensity modulated microstress sensor according to claim 1 based on the weak chirp grating of outstanding core fibre, feature
Be: the material of the first fiber optic protection shell (1) is resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910093444.7A CN109799015A (en) | 2019-01-30 | 2019-01-30 | Intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910093444.7A CN109799015A (en) | 2019-01-30 | 2019-01-30 | Intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109799015A true CN109799015A (en) | 2019-05-24 |
Family
ID=66560709
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910093444.7A Pending CN109799015A (en) | 2019-01-30 | 2019-01-30 | Intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109799015A (en) |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038205A (en) * | 2007-04-27 | 2007-09-19 | 武汉理工大学 | Chirp optical fiber grating sensor and intensity demodulation system thereof |
| CN101526389A (en) * | 2009-03-26 | 2009-09-09 | 中国计量学院 | Weighting sensor with intensity demodulation chirped fiber grating |
| CN101846491A (en) * | 2010-05-31 | 2010-09-29 | 哈尔滨工程大学 | Interferometer combined by double F-P chambers and Michelson |
| KR20110032514A (en) * | 2009-09-23 | 2011-03-30 | 한국에너지기술연구원 | High-speed demodulation system for fbg sensors using multi-window fabry-perot filter |
| CN102680150A (en) * | 2012-05-28 | 2012-09-19 | 天津亿利科能源科技发展股份有限公司 | Nonlinear chirped fiber grating two-dimensional distributed strain sensing pipeline monitor device |
| CN103746288A (en) * | 2013-12-23 | 2014-04-23 | 南京大学 | Overprinting chirp structure-based DFB semiconductor laser and laser array |
| CN104199086A (en) * | 2014-09-24 | 2014-12-10 | 哈尔滨工业大学 | Single-component fiber-optic geophone, three-component fiber-optic microseismic geophone comprising same and three-component fiber-optic microseismic detection array also comprising same |
| CN105044033A (en) * | 2014-12-10 | 2015-11-11 | 中国计量学院 | Intensity-demodulation optical fiber gas sensing device |
| CN106338352A (en) * | 2016-09-19 | 2017-01-18 | 电子科技大学 | Optical fiber pressure sensor of inaction contact angle measurement error |
| CN108195299A (en) * | 2017-12-25 | 2018-06-22 | 北京信息科技大学 | For the FP of high temperature strain measurement and regeneration FBG compound sensors |
| CN105674951B (en) * | 2015-12-30 | 2018-12-04 | 基康仪器股份有限公司 | Integrated settling monitoring device based on fiber F-P cavity pressure sensor |
-
2019
- 2019-01-30 CN CN201910093444.7A patent/CN109799015A/en active Pending
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101038205A (en) * | 2007-04-27 | 2007-09-19 | 武汉理工大学 | Chirp optical fiber grating sensor and intensity demodulation system thereof |
| CN101526389A (en) * | 2009-03-26 | 2009-09-09 | 中国计量学院 | Weighting sensor with intensity demodulation chirped fiber grating |
| KR20110032514A (en) * | 2009-09-23 | 2011-03-30 | 한국에너지기술연구원 | High-speed demodulation system for fbg sensors using multi-window fabry-perot filter |
| CN101846491A (en) * | 2010-05-31 | 2010-09-29 | 哈尔滨工程大学 | Interferometer combined by double F-P chambers and Michelson |
| CN102680150A (en) * | 2012-05-28 | 2012-09-19 | 天津亿利科能源科技发展股份有限公司 | Nonlinear chirped fiber grating two-dimensional distributed strain sensing pipeline monitor device |
| CN103746288A (en) * | 2013-12-23 | 2014-04-23 | 南京大学 | Overprinting chirp structure-based DFB semiconductor laser and laser array |
| CN104199086A (en) * | 2014-09-24 | 2014-12-10 | 哈尔滨工业大学 | Single-component fiber-optic geophone, three-component fiber-optic microseismic geophone comprising same and three-component fiber-optic microseismic detection array also comprising same |
| CN105044033A (en) * | 2014-12-10 | 2015-11-11 | 中国计量学院 | Intensity-demodulation optical fiber gas sensing device |
| CN105674951B (en) * | 2015-12-30 | 2018-12-04 | 基康仪器股份有限公司 | Integrated settling monitoring device based on fiber F-P cavity pressure sensor |
| CN106338352A (en) * | 2016-09-19 | 2017-01-18 | 电子科技大学 | Optical fiber pressure sensor of inaction contact angle measurement error |
| CN108195299A (en) * | 2017-12-25 | 2018-06-22 | 北京信息科技大学 | For the FP of high temperature strain measurement and regeneration FBG compound sensors |
Non-Patent Citations (2)
| Title |
|---|
| 姜月华 等: "《长江三角洲经济区环境地质》", 30 November 2015 * |
| 宋美娟 等: "《材料成形测试技术》", 30 April 2018 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101949744B (en) | Fiber grating-based transformer internal temperature detection system | |
| CN100367016C (en) | Fibre-optical temperature measuring device and measurement thereof | |
| US5132529A (en) | Fiber-optic strain gauge with attached ends and unattached microbend section | |
| Zou et al. | Wide range FBG displacement sensor based on twin-core fiber filter | |
| Gupta et al. | Industrial fluid flow measurement using optical fiber sensors: A review | |
| Liu et al. | Fiber Bragg grating based displacement sensors: State of the art and trends | |
| Li et al. | A sensitivity-enhanced flexible acoustic sensor using side-polished fiber Bragg grating | |
| CN110174068A (en) | A kind of sensitizing type Fabry-perot optical fiber microcavity strain transducer and preparation method thereof | |
| CN102261965A (en) | Temperature sensing method and device based on double-core optical fiber | |
| CN112924082A (en) | High-sensitivity air pressure sensor based on suspension core optical fiber and side hole optical fiber | |
| CN108318452A (en) | A kind of cone of intensity modulation type four light fibre humidity transducer | |
| EP3298366B1 (en) | A temperature sensor | |
| CN102364313B (en) | High-temperature sensing method based on optical fiber micro Michelson interference on spherical end face | |
| Baldwin et al. | Review of fiber optic accelerometers | |
| CN109799015A (en) | Intensity modulated microstress sensor based on the weak chirp grating of outstanding core fibre | |
| Chang et al. | Fiber optic vibration sensor based on over-coupled fused coupler | |
| Matsuo et al. | Cantilever type accelerometer based on a mirror-terminated hetero-core optical fiber | |
| El-Gammal et al. | Strain sensing in underwater acoustics with a hybrid π-shifted FBG and different interrogation methods | |
| CN102997849B (en) | Micro-displacement sensing method and device based on photonic crystal fiber long period grating | |
| CN112212966B (en) | Optical fiber vibration sensor based on femtosecond laser writing spiral waveguide | |
| JP2003084014A (en) | Disturbance amount compensating method and device of optical sensor | |
| CN201464078U (en) | Single sleeve pipe etch-type fiber Bragg grating temperature and enhanced sensibility sensor | |
| CN102221425B (en) | Micro-pressure sensor based on short cavity fiber laser | |
| CN203083528U (en) | Micro-displacement sensing device based on photonic crystal optical fiber long-time cycle optical grating | |
| Qiu et al. | A temperature-insensitive FBG acceleration sensor with sinusoid-shaped curved beams |
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 | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20190524 |