CN108760079A - A kind of Sagnac interference temperature sensors based on liquid crystal filled micro-structure optical fiber - Google Patents
A kind of Sagnac interference temperature sensors based on liquid crystal filled micro-structure optical fiber Download PDFInfo
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- CN108760079A CN108760079A CN201810409714.6A CN201810409714A CN108760079A CN 108760079 A CN108760079 A CN 108760079A CN 201810409714 A CN201810409714 A CN 201810409714A CN 108760079 A CN108760079 A CN 108760079A
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- 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
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Abstract
The invention discloses a kind of Sagnac temperature sensors based on liquid crystal filled micro-structure optical fiber, including wideband light source BBS, three-dB coupler, Polarization Controller PC, microstructured optical fibers MOF, plate electrode and its power supply and spectrometer OSA.Wideband light source BBS exports laser to three-dB coupler, laser is divided into the two-beam propagated clockwise and anticlockwise by three-dB coupler, Polarization Controller PC makes linearly polarized light polarization be rotated by 90 °, the fully filled SF57 microstructured optical fibers MOF of nematic liquid crystal E7 are connected in Sagnac optical interference circuits, parallel plate electrode and its power supply in microstructured optical fibers both sides, which provide electric field, makes liquid crystal molecule be orientated along direction of an electric field, and spectrometer OSA measures the interference spectrum of three-dB coupler output.The present invention, such as pore opening, stomata spacing and fiber lengths, can adjust interference wave-length coverage and the sensitivity of temperature measurement by changing optical fiber structure parameter.
Description
Technical field
The present invention relates to a kind of Sagnac of liquid crystal filled micro-structure optical fiber to interfere temperature sensor, Sagnac interference temperature
Degree sensor can be used for highly sensitive temperature and measure, and belong to technical field of optical fiber sensing.
Background technology
Immune to electromagnetic wave due to having, highly sensitive, anticorrosive, the advantages that being easy to remote control, optical fiber is used to survey
The variation of amount and monitoring physical quantity.By being transformed to traditional fiber, such as fiber finish at D types structure or ultraviolet light week
The irradiation of phase property is fabricated to grating etc., can enhance fiber core transmission mode and be covered in around optical fiber in the sensitive material of outfield
The measurement to extraneous physical field is realized in coupling between defect transmission mode.
The presence of covering airport in microstructured optical fibers provides naturally for filling of the functional material in optical fiber airport
Channel is provided with more flexible structure design and material filling mode compared to traditional fiber, is conducive to further increase measurement
Sensitivity and the application range for expanding optical fiber.Covering fill functional material microstructured optical fibers, light-transfer characteristic simultaneously again by
The influence for having arrived the functional material of outfield modulation, to probe into the interaction mechanism of light and substance, the highly sensitive optical fiber of development of new
Sensing provides important channel.
Functional material filled microstructured optical fibers are fused in Sagnac interferometers, are rolled over using outfield modulation packing material
The physical characteristic for penetrating rate changes the birefringence of microstructured optical fibers, causes the movement of Sagnac interference fringes, is passed so as to realize
Sensed quantity.The quartzy base birefringence microstructured optical fibers that alcohol is filled are linked into Sagnac interference by Chun-LiuZhao in 2012 etc.
In instrument, the temperature measurement sensitivity of ranging from 32-64 DEG C of measuring temperature, acquisition is -1.17nm/ DEG C.ERICKREYES- in 2017
The quartzy microstructured optical fibers that wire indium is filled two side macropores outside covering by VERA etc. are linked into Sagnac interferometers, are surveyed
The temperature measurement sensitivity obtained when ranging from 22.4 DEG C -46 DEG C of amount temperature reaches -9.0nm/ DEG C.
Currently, the optical fiber background material based on microstructured optical fibers Sagnac interferometers is quartz, while to keep fibre core
Mould is transmitted as refractive-index-guiding, and the refractive index of packing material need to generally be less than quartz.Refractive index is more than the various functions material of quartz
Material, such as nematic liquid crystal E7, being filled into microstructured optical fibers covering airport can cause core mode transmission mode by refractive index
Leading type becomes band gap type, is unfavorable for realizing linear, highly sensitive microstructured optical fibers Sagnac interference sensings.2012
The quartzy base microstructured optical fibers that liquid crystal E7 is filled are linked into Sagnac interferometers by YiFanZhang etc., in 30-91 DEG C of temperature
Degree range internal interference trough wavelength is unsatisfactory for linear relationship with temperature, and it is low to measure average sensitivity for temperature when fiber lengths are 66mm
In 0.3nm/ DEG C.The quartzy base microstructured optical fibers of liquid crystal Selective filling are linked into Sagnac and done by TingtingHan in 2017 etc.
In interferometer, realizes temperature using the thermal tuning of band gap and measure, trough wavelength and temperature are interfered within the temperature range of 37-56 DEG C
Linear relationship is unsatisfactory between degree, temperature be 47.2 DEG C spend when sensitivity be -41nm/ DEG C.It is aobvious in other temperature spot sensitivity
Writing reduces, and 55 DEG C of sensitivity when spending are -6nm/ DEG C.
Invention content
Soft glass material such as lead silicate glass, tellurate glass, chalcogenide glass etc. are the micro-structure that background material makes
Optical fiber, effective refractive index can be more than liquid crystal, and microstructured optical fibers still remain refractive index after filling liquid crystal in its stomata
Guiding.It is linked into Sagnac interferometers, is advantageously implemented that structure is more flexible, and the linearity is good, the higher biography of sensitivity
Sensor.
The technical problem to be solved by the present invention is to the lead silicate glass SF57 by studying nematic liquid crystal E7 fillings is micro-
Mode birefringence of the structured optical fiber under the parameters such as different optical fiber airport sizes, air pitch of holes and microstructured optical fibers length
Characteristic variation with temperature relationship designs the highly sensitive Sagnac interference temperature sensors based on the microstructured optical fibers.
The object of the present invention is to provide a kind of Sagnac of liquid crystal filled micro-structure optical fiber to interfere temperature sensor.
In order to solve above-mentioned technical problem, the present invention is achieved through the following technical solutions.
A kind of Sagnac interference temperature sensors based on liquid crystal filled micro-structure optical fiber, including wideband light source BBS, 3dB
Coupler, Polarization Controller PC, microstructured optical fibers MOF, plate electrode and its power supply and spectrometer OSA；Wideband light source BBS outputs
To three-dB coupler, the wideband light source BBS laser exported is divided into along clockwise direction and square counterclockwise laser by three-dB coupler
To two bunch polarised lights of propagation, Polarization Controller PC makes the polarization direction of this two bunch polarised light be rotated by 90 °；Micro-structure light
Fine MOF is connected in Sagnac light paths, and the both sides microstructured optical fibers MOF are provided with the parallel plate electrode by power supply power supply, is put down
The electric field that row plate electrode generates makes liquid crystal molecule be orientated along direction of an electric field, causes along two propagated clockwise and counterclockwise
Shu Guang is interfered in three-dB coupler output end；Spectrometer OSA is used to measure the interference spectrum of three-dB coupler output；
The microstructured optical fibers MOF background materials are lead silicate glass SF57, and covering is the symmetrical stomata knot of regular hexagon
Structure is distributed, all covering stomata diameter d having the same, and stomata spacing is Λ；Nematic liquid crystal is filled in whole covering stomatas
E7；The microstructured optical fibers MOF length is L.
Since air hole structure is symmetrical, described microstructured optical fibers itself do not have birefringent characteristic.Anisotropy nematic phase liquid
Brilliant E7 being filled up completely in all covering stomatas is so that the microstructured optical fibers are provided with birefringent characteristic.Temperature change causes liquid
Brilliant E7 refractive index changes, so that the birefringence of the microstructured optical fibers changes, spectrometer OSA is caused to measure
Interference spectrum moves.Trough wavelength by detecting interference spectrum can be used for measuring temperature.
There is linear relationship between the interference trough wavelength and temperature of Sagnac interferometers, and interfere wave-length coverage and temperature
Spending measurement sensitivity can be by changing optical fiber structure parameter, such as pore opening, stomata spacing, and fiber lengths etc. are adjusted.
As a preferred solution of the present invention, the microstructured optical fibers MOF covering hole diameters d is 2.0~2.8 μm,
Stomata spacing Λ is 3.8~4.2 μm, and length L is 2~6mm.
When d=2.0 μm of covering hole diameter, stomata spacing Λ=4 μm when microstructured optical fibers length L=2mm, measure the
The temperature control that interference trough wavelength in one Free Spectral Range FSRI obtains reaches 15nm/K, and measuring temperature is ranging from
290K-320K；It measures the temperature control that the interference trough wavelength in second Free Spectral Range FSRII obtains and reaches 18nm/
K, measuring temperature ranging from 290K-310K.
When covering hole diameter increases to 2.4 μm and 2.8 μm, the interference in first Free Spectral Range FSRI is measured
The temperature control that trough wavelength obtains is reduced to 14.6nm/K and 13.5nm/K.When air pitch of holes is 3.8 μm and 4.2
μm when, the obtained temperature control of interference trough wavelength measured in first Free Spectral Range FSRI is respectively 13.9nm/K
And 16nm/K.When microstructured optical fibers length increases to 4mm and 6mm, the interference in first Free Spectral Range FSRI is measured
The temperature control that trough wavelength obtains is reduced to 10.8nm/K and 8.8nm/K.
Due to the adoption of the above technical scheme, the present invention has the advantages that compared with prior art：
1, the SF57 microstructured optical fibers covering used in the present invention is simple in structure to be easy to for symmetrical regular hexagon gas cell distribution
It draws.The microstructured optical fibers itself do not have birefringent characteristic.
2, anisotropy nematic liquid crystal E7 is filled up completely in SF57 microstructured optical fibers covering stomatas, filling mode letter
It is single.Optical fiber one end need to be only immersed in liquid crystal E7, automatic filling can be realized using capillary phenomenon.SF57 microstructured optical fibers are in liquid
Brilliant E7 is provided with birefringent characteristic after being filled into airport, and its birefringence has thermal tuning.
3, structural parameters (such as hole diameter d, stomata spacing Λ and the micro-structure that the present invention passes through change microstructured optical fibers
Fiber lengths L) adjusting for interfering wave-length coverage and temperature measurement sensitivity can be achieved.In d=2.0~2.8 μm, Λ=3.8~
4.2 μm, in the range of L=2~6mm, linear relationship is all had between the interference trough wavelength and temperature of Sagnac interferometers.d
=2.0 μm, Λ=4 μm, when L=2mm, temperature control reaches 15nm/K in first Free Spectral Range FSRI.D increases to
At 2.4 μm and 2.8 μm, sensitivity is respectively 14.6nm/K and 13.5nm/K.When Λ changes into 3.8 μm and 4.2 μm, sensitivity point
It Wei not 13.9nm/K and 16nm/K.When L changes into 4mm and 6mm, sensitivity is respectively 10.8nm/K and 8.8nm/K.
Description of the drawings
Fig. 1 is the Sagnac interferometer light path schematic diagrames of the embodiment of the present invention 1；
Fig. 2 is the microstructured optical fibers cross-sectional view of the embodiment of the present invention 1；
Fig. 3 is the fibre core basic mode dispersion that the liquid crystal E7 filling SF57 microstructured optical fibers of the embodiment of the present invention 1 vary with temperature
Figure；Illustration (a) therein is the mode distributions figure of fibre core basic mode TE moulds, and illustration (b) is the mode distributions figure of fibre core basic mode TM moulds,
Illustration (c) is the partial enlarged view of the microstructured optical fibers dispersion map, and temperature is increased to 320K by the intervals 290K 5K.
Fig. 4 is the Sagnac interferometers normalized power output figure at different temperatures of the embodiment of the present invention 1；
Fig. 5 is the sensitivity analysis figure of the trough wavelength with temperature variation of the embodiment of the present invention 1；
Fig. 6 is the sensitivity analysis of trough wavelength with temperature variation of the embodiment of the present invention 2,3 in different hole diameter d
Figure；
Fig. 7 is the sensitivity point of trough wavelength with temperature variation of the embodiment of the present invention 4,5 in different stomata spacing Λ
Analysis figure；
Fig. 8 is the sensitive of trough wavelength with temperature variation of the embodiment of the present invention 6,7 in different microstructured optical fibers length
Spend analysis chart.
Specific implementation mode
Present invention is further described in detail with specific implementation mode below in conjunction with the accompanying drawings：
Embodiment 1
In the Sagnac interferometer light path schematic diagrames of the embodiment of the present invention 1 shown in Fig. 1, broad band laser light source BBS is defeated
Go out laser to three-dB coupler, light is divided into the two bunch polarised lights propagated clockwise and anticlockwise, polarization control by three-dB coupler
Device PC processed makes two bunch polarization light polarization be rotated by 90 °, the fully filled SF57 microstructured optical fibers MOF connections of nematic liquid crystal E7
Into Sagnac optical interference circuits, parallel plate electrode and its power supply in microstructured optical fibers both sides, which provide electric field, makes liquid crystal molecule edge
Direction of an electric field is orientated, and spectrometer OSA measures the interference spectrum of three-dB coupler output.Microstructured optical fibers structural representation shown in Fig. 2
In figure, optical fiber background material is lead silicate glass SF57, and all stomata filling liquid crystals, filling liquid crystal is anisotropy nematic phase
Liquid crystal E7.Three layers of stomata of covering are distributed for regular hexagon, d=2.0 μm of hole diameter, stomata spacing Λ=4 μm, microstructured optical fibers
Length L=2mm.
In the dispersion map of the microstructured optical fibers of the embodiment of the present invention 1 shown in Fig. 3, as wavelength increases, the two of optical fiber
The refractive index of a basic mode TM moulds and TE moulds reduces.When temperature is increased to 320K by 290K, optical fiber basic mode TM modal refractive index by
Gradually decline, and basic mode TE being basically unchanged of modal refractive index.TE moulds and TM mode distributions keep circle symmetrical Gaussian-like distribution.
The relationship that the Sagnac interferometer normalized output power of the embodiment of the present invention 1 shown in Fig. 4 varies with temperature
In figure, it can be seen that interferometer has several different output troughs at the same temperature, as temperature is increased to by 290K
320K, interferometer output spectra trough are gradually moved to long wave direction.
In the interference spectrum trough variation with temperature relational graph of the embodiment of the present invention 1 shown in Fig. 5, by first freedom
Interference trough in spectral region varies with temperature approximation and meets linear relation, and fitting a straight line obtains the interferometer temperature sensor
Sensitivity be 15nm/K；Approximation is varied with temperature by the interference trough in second Free Spectral Range and meets linear relation,
The sensitivity that fitting a straight line obtains the interferometer temperature sensor is 18nm/K.Temperature sensing is carried out using first interference trough
The Free Spectral Range (FSRI) of measurement is 290K-320K, and the freedom of temperature sensing measurement is carried out using second interference trough
Spectral region (FSRII) is 290K-310K.First interference trough has broader measurement range.
Embodiment 2
The embodiment of the present invention 2 is substantially the same manner as Example 1, the difference is that hole diameter increases to 2.4 μm, first
Interference trough variation with temperature relationship in a Free Spectral Range is as shown in Figure 6.It is dry in first Free Spectral Range
It relates to trough and varies with temperature approximation and meet linear relationship, fitting a straight line obtains the interferometer temperature sensor sensitivity and is
14.6nm/K。
Embodiment 3
The embodiment of the present invention 3 is substantially the same manner as Example 1, the difference is that hole diameter increases to 2.8 μm, first
Interference trough variation with temperature relationship in a Free Spectral Range is as shown in Figure 6.It is dry in first Free Spectral Range
It relates to trough and varies with temperature approximation and meet linear relationship, fitting a straight line obtains the interferometer temperature sensor sensitivity and is
13.5nm/K。
Embodiment 4
The embodiment of the present invention 4 is substantially the same manner as Example 1, the difference is that air pitch of holes is reduced to 3.8 μm,
Interference trough variation with temperature relationship in one Free Spectral Range is as shown in Figure 7.In first Free Spectral Range
Interference trough varies with temperature approximation and meets linear relationship, and fitting a straight line obtains the interferometer temperature sensor sensitivity and is
13.9nm/K。
Embodiment 5
The embodiment of the present invention 5 is substantially the same manner as Example 1, the difference is that air pitch of holes increases to 4.2 μm,
Interference trough variation with temperature relationship in one Free Spectral Range is as shown in Figure 7.In first Free Spectral Range
Interference trough varies with temperature approximation and meets linear relationship, and fitting a straight line obtains the interferometer temperature sensor sensitivity and is
16nm/K。
Embodiment 6
The embodiment of the present invention 6 is substantially the same manner as Example 1, the difference is that microstructured optical fibers length increase is to 4mm,
Interference trough variation with temperature relationship in first Free Spectral Range is as shown in Figure 8.In first Free Spectral Range
Interference trough vary with temperature approximation and meet linear relationship, fitting a straight line obtains the interferometer temperature sensor sensitivity and is
10.8nm/K。
Embodiment 7
The embodiment of the present invention 7 is substantially the same manner as Example 1, the difference is that microstructured optical fibers length increase is to 6mm,
Interference trough variation with temperature relationship in first Free Spectral Range is as shown in Figure 8.In first Free Spectral Range
Interference trough vary with temperature approximation and meet linear relationship, fitting a straight line obtains the interferometer temperature sensor sensitivity and is
8.8nm/K。
Claims (2)
1. a kind of Sagnac based on liquid crystal filled micro-structure optical fiber interferes temperature sensor, it is characterised in that：The sensor
Including wideband light source BBS, three-dB coupler, Polarization Controller PC, microstructured optical fibers MOF, plate electrode and its power supply and spectrometer
OSA；Wideband light source BBS exports laser to three-dB coupler, and the wideband light source BBS laser exported is divided into along suitable by three-dB coupler
Clockwise and the two bunch polarised lights counterclockwise propagated, Polarization Controller PC make the polarization direction of this two bunch polarised light
It is rotated by 90 °；Microstructured optical fibers MOF is connected in Sagnac light paths, is provided with by power supply power supply in the both sides microstructured optical fibers MOF
Parallel plate electrode, parallel plate electrode generate electric field so that liquid crystal molecule is orientated along direction of an electric field, cause along clockwise with
The two-beam counterclockwise propagated is interfered in three-dB coupler output end；Spectrometer OSA is defeated for measuring three-dB coupler
The interference spectrum gone out；
The microstructured optical fibers MOF background materials are lead silicate glass SF57, and covering is the symmetrical air hole structure of regular hexagon point
Cloth, all covering stomata diameter d having the same, stomata spacing are Λ；Nematic liquid crystal E7 is filled in whole covering stomatas；Institute
It is L to state microstructured optical fibers MOF length.
2. a kind of Sagnac based on liquid crystal filled micro-structure optical fiber according to claim 1 interferes temperature sensor,
It is characterized in that：The microstructured optical fibers MOF covering hole diameters d is 2.0~2.8 μm, and stomata spacing Λ is 3.8~4.2 μm, long
Degree L is 2~6mm.
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Cited By (5)
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| CN108692827A (en) * | 2018-04-08 | 2018-10-23 | 东北大学 | A kind of automatically controlled tuning type long period photonic crystal fiber grating temperature sensor |
| CN111426337A (en) * | 2020-03-30 | 2020-07-17 | 重庆邮电大学 | Sagnac interference fluid sensing system based on side-throwing optical fiber |
| CN112729357A (en) * | 2020-12-28 | 2021-04-30 | 重庆邮电大学 | Polished fiber-microstructure fiber fluid sensing system based on Sagnac interferometer |
| CN113138035A (en) * | 2021-04-22 | 2021-07-20 | 东北大学 | Temperature sensor and temperature measurement system based on optical fiber dispersion wave |
| CN113758600A (en) * | 2021-09-08 | 2021-12-07 | 燕山大学 | Sagnac temperature sensor based on nematic liquid crystal |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
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| CN112729357A (en) * | 2020-12-28 | 2021-04-30 | 重庆邮电大学 | Polished fiber-microstructure fiber fluid sensing system based on Sagnac interferometer |
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| CN113138035A (en) * | 2021-04-22 | 2021-07-20 | 东北大学 | Temperature sensor and temperature measurement system based on optical fiber dispersion wave |
| CN113758600A (en) * | 2021-09-08 | 2021-12-07 | 燕山大学 | Sagnac temperature sensor based on nematic liquid crystal |
| CN113758600B (en) * | 2021-09-08 | 2022-06-10 | 燕山大学 | Sagnac temperature sensor based on nematic liquid crystal |
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Inventor after: Chen Hailiang Inventor after: Ma Mingjian Inventor after: Li Shuguang Inventor after: Jing Xili Inventor after: Li Jianshe Inventor after: Liu Yingchao Inventor before: Chen Hailiang Inventor before: Ma Mingjian Inventor before: Li Shuguang Inventor before: Jing Xili Inventor before: Li Jianshe Inventor before: Liu Yingchao |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181106 |