CN107271077A - A kind of insensitive temperature sensor of pulling force based on Sagnac principle - Google Patents
A kind of insensitive temperature sensor of pulling force based on Sagnac principle Download PDFInfo
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- CN107271077A CN107271077A CN201710571322.5A CN201710571322A CN107271077A CN 107271077 A CN107271077 A CN 107271077A CN 201710571322 A CN201710571322 A CN 201710571322A CN 107271077 A CN107271077 A CN 107271077A
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- coupler
- pulling force
- temperature sensor
- sensing unit
- force based
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- 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
Abstract
The invention discloses a kind of insensitive temperature sensor of the pulling force based on Sagnac principle, including wideband light source, sensing unit, three-dB coupler, Polarization Controller and spectrometer, No. 1 end of the three-dB coupler is connected with wideband light source, No. 2 ends of three-dB coupler are connected with spectrometer, No. 3 ends of three-dB coupler are connected with one end of sensing unit, the other end of sensing unit is connected with Polarization Controller one end, and the other end of Polarization Controller and three-dB coupler No. 4 ends are connected.The present invention have the advantages that compact conformation, prepares it is simple, it is insensitive to pulling force, measurement result accurately, sensitivity height, have very big application prospect in terms of various temperature surveys.
Description
Technical field
The present invention relates to technical field of optical fiber, more particularly to a kind of fibre optical sensor.
Background technology
In recent years, fiber optic interferometric sensor have small volume, lightweight, sensitivity it is high, not by electromagnetic interference, corrosion-resistant
The advantages of and as fibre optical sensor most practical one kind.In addition, in scientific research, temperature is an important ginseng of detection and control
Number, but in inflammable, explosive, strong-electromagnetic field, super-pressure, ultralow pressure, the gas that is corrosive, liquid, and require noncontact and
In the particular job such as quick response situation and environment, conventional temperature sensor can not have very good performance.
Temperature is the physical quantity for representing the cold and hot degree of object, while being also an important parameter in industrial and agricultural production, energy
Enough very accurately changes of reflection external environment information.And that to be one kind for growing up in recent years be used for optical-fiber temperature measuring is real-time
The new and high technology of measurement space temperature, the development advanced by leaps and bounds.In meteorology, material, industry, aviation, medicine and other fields
In, the accurate detection of temperature has very important effect.At present relatively common fibre optic temperature sensor mainly have cascade connection type,
Distributed fiber grating type, Sagnac interference-type etc..Such as Wu Tiesheng proposes a kind of high double-refraction photon crystal fiber ring
Mirror temperature sensor, is realized in experiment by filling ethanol to high double-refraction photon crystal fiber airport to improve thermo-optical coeffecient
Temperature survey, temperature control is up to 8.837nm/ DEG C；Han Tingting etc. devises a kind of photonic crystal fiber ring mirror TEMP
Device, using special liquid to photonic crystal fiber airport selective filling, its temperature control is up to -11.6nm/ DEG C.Jiang De
Raw etc. to have made multi-mode optica lfiber grating using the multimode fibre of hydrogen-sensitized processing, its temperature control has reached 9.8pm/ DEG C；
Y.Cardona-Maya etc. proposes a kind of insensitive temperature sensor of refractive index, gold-plated on inductive probe, the spirit of its temperature
Sensitivity is up to 5830nm/ DEG C.Document above to the temperature response characteristics of sensor go deep into and significant research, but
The stress that can be usually brought during measurement temperature by external environment is influenceed, and causes measurement result inaccurate.
The content of the invention
Present invention aims at provide a kind of compact conformation, prepare simple, sensitivity height, measurement to be accurately based on Sagner
The insensitive temperature sensor of pulling force of gram principle.
To achieve the above object, following technical scheme is employed：The invention mainly comprises wideband light source, sensing unit, 3dB
Coupler, Polarization Controller and spectrometer, No. 1 end of the three-dB coupler are connected with wideband light source, No. 2 of three-dB coupler
End is connected with spectrometer, and No. 3 ends of three-dB coupler are connected with one end of sensing unit, the other end and polarization of sensing unit
Controller one end is connected, and the other end of Polarization Controller and three-dB coupler No. 4 ends are connected.
Further, the sensing unit includes PbS optical fiber and two section single-mould fibers, at the two ends fusing point of PbS optical fiber
Respectively with two section single-mould fiber dislocation-free weldings.
Further, the wideband light source is from the wideband light source that wave-length coverage is 1520~1610nm.
Further, the core diameter of the single-mode fiber is 9 μm, 125 μm of cladding diameter；The length of PbS optical fiber is
8mm, core diameter are 9 μm, 125 μm of cladding diameter.
Further, the three-dB coupler test wavelength is 1550nm, and bandwidth of operation is 1530nm~1570nm.
Further, the spectrometer communication band is 1200~2400nm, and resolution ratio is 0.02nm.
The course of work approximately as：
PbS optical fiber is that doping PbS is made in the fibre core of single-mode fiber, and the main component of single-mode fiber is to mix germanium
SiO2, with stable positive tetrahedron structure, therefore its thermal coefficient of expansion is relatively low.After the doping PbS in single-mode fiber fibre core
Its stable tetrahedral structure is broken, while PbS is as a kind of semi-conducting material, its band gap is smaller, under room temperature state
The influence of the extraneous factors such as temperature is highly prone to, with higher thermal coefficient of expansion.Therefore, PbS optical fiber is more sensitive to temperature,
The phase-delay quantity of its thermally induced birefringence is higher than single-mode fiber.
During temperature change, PbS optical fiber produces thermal birefringence effect, and the phase birefringence B of PbS optical fiber changes therewith.With
Temperature rise, the change of wavelength can be expressed as：
Local derviation is sought into the left and right ends of formula (1) to temperature (T) simultaneously：
L is the access length of PbS optical fiber in formula, and B is phase birefringence, and δ is phase delay.Wavelength X is the letter of temperature (T)
Number, therefore, passes through the change of wavelength caused by detection temperature, it is possible to realize the detection of temperature.
Compared with prior art, the invention has the advantages that：
1st, compact conformation, preparation are simple, only need to be by PbS optical fiber and two section single-mould fiber dislocation-free weldings.To pulling force
Insensitive, it is to avoid influence of the pulling force to temperature survey, measurement result is accurate, and sensitivity is high.
2nd, realize the detection of external environment information based on Sagnac principle of interference, sensitivity is high, have it is very wide should
With prospect, there is huge application potential in terms of Fibre Optical Sensor.
Brief description of the drawings
Fig. 1 is simplified schematic diagram of the invention.
Fig. 2 is the structure schematic diagram of sensing unit of the present invention.
Fig. 3 is the transmission light spectrogram of sensing unit of the present invention.
Fig. 4 is that inventive sensor measures pulling experiment schematic device.
Transmission light spectrograms of the Fig. 5 for the present invention at different temperatures.
Fig. 6 in 36.0 DEG C~70.0 DEG C temperature ranges, transmits the graph of a relation between spectral line and temperature change to be of the invention.
Transmission light spectrograms of the Fig. 7 for the present invention under different pulling force.
Fig. 8 is the present invention in the μ ε weight ranges of 0 μ ε~1400, the graph of a relation between transmission spectral line and tension variations.It is attached
Figure grade：No. 1 end of 1-3dB couplers, No. 2 ends of 2-3dB couplers, No. 3 ends of 3-3dB couplers, 4-3dB couplers No. 4 ends, 5-
Three-dB coupler, 6- wideband light sources, 7- spectrometers, 8- Polarization Controllers, 9- temperature control boxs, 10- sensing units, 11- single-mode fibers,
12-PbS optical fiber and single-mode fiber fusing point, 13-PbS optical fiber, 14- single-mode fibers covering, 15- single-mode fibers fibre core, 16-PbS light
Long and slender core, 17-PbS fibre claddings, 18- mobile platforms.
Embodiment
The present invention will be further described below in conjunction with the accompanying drawings：
As shown in figure 1, No. 1 end 1 of three-dB coupler 5 is connected with wideband light source 6, No. 2 ends 2 are connected with spectrometer 7, No. 3 ends
3 are connected with one end of sensing unit 10, and the other end of sensing unit is connected with the one end of Polarization Controller 8, Polarization Controller
No. 4 ends 4 of the other end and three-dB coupler are connected.Sensing unit 10 is placed in temperature control box 9, from the record correspondence temperature of spectrometer 7
Transmission spectrum under degree, transmission spectrum is as shown in Figure 5.
As shown in Fig. 2 sensing unit 10 includes single-mode fiber 11, PbS optical fiber 13, at the two ends fusing point 12 of PbS optical fiber
Respectively with the dislocation-free welding of single-mode fiber 11, the core diameter of the single-mode fiber 11 is 9 μm, 125 μm of cladding diameter；PbS light
The length of fibre 13 is that 8mm, core diameter are 9 μm, 125 μm of cladding diameter.
, it is necessary to which the experimental facilities used has Furukawa FITEL S178 type optical fiber splicers during prepared by sensor,
Wave-length coverage is 1520-1610nm ASE3700 types wideband light source and AQ6375 type optical spectrometers.In cutting optical fibre,
Ensure the flatness and cleanliness factor of fiber end face as far as possible, and carry out using manual weld by the way of melting between PbS optical fiber and SMF
Connect, welding current is set to 80mA., will because heat sealing machine uses the mode of propulsion welding, therefore in optical fiber align
Two sections of optical fiber leave a fixed gap to ensure the fitness and flatness of fused fiber splice end face, reach the preferably effect of dislocation-free welding
Really.The length that Fig. 3 show PbS optical fiber is the transmission spectrum of 8mm sensors.From figure 3, it can be seen that the sensing unit is produced
Sagnac interference, forms relatively good interference fringe.
As shown in figure 4, No. 1 end of three-dB coupler is connected with light source, No. 2 ends are connected with spectrometer, No. 3 ends and sensing unit
One end connection, the other end of sensing unit is connected with Polarization Controller one end, and the other end of Polarization Controller is coupled with 3dB
No. 4 end connections of device.Sensing unit is placed on mobile platform 18 and is fixed, by adjusting the distance between mobile platform
Change the size of pulling force suffered by optical fiber, the transmission spectrum under the different pulling force of correspondence, transmission spectrum such as Fig. 7 institutes are recorded from spectrometer 7
Show.
The temperature control and pulling force sensitivity that sensor can be drawn from Fig. 6, Fig. 8 be respectively 53.89pm/ DEG C and-
0.00016nm/με.Therefore, the sensor for temperature is very sensitive and insensitive to pulling force.The sensor is effectively avoided
Influence of the pulling force to sensing unit during detection temperature parameter.When detecting the temperature of specific object, different ripples are measured from spectrometer
The drift value of peak (paddy) wavelength, you can draw the variable quantity of temperature.
Embodiment described above is only that the preferred embodiment of the present invention is described, not to the model of the present invention
Enclose and be defined, on the premise of design spirit of the present invention is not departed from, technical side of the those of ordinary skill in the art to the present invention
In various modifications and improvement that case is made, the protection domain that claims of the present invention determination all should be fallen into.
Claims (6)
1. a kind of insensitive temperature sensor of pulling force based on Sagnac principle, mainly including wideband light source, sensing unit,
Three-dB coupler, Polarization Controller and spectrometer, it is characterised in that：No. 1 end of the three-dB coupler is connected with wideband light source,
No. 2 ends of three-dB coupler are connected with spectrometer, and No. 3 ends of three-dB coupler are connected with one end of sensing unit, sensing unit
The other end be connected with Polarization Controller one end, the other end of Polarization Controller and three-dB coupler No. 4 end connect.
2. a kind of insensitive temperature sensor of pulling force based on Sagnac principle according to claim 1, its feature exists
In：The sensing unit include PbS optical fiber and two section single-mould fibers, at the two ends fusing point of PbS optical fiber respectively with two sections of single modes
Optical fiber dislocation-free welding.
3. a kind of insensitive temperature sensor of pulling force based on Sagnac principle according to claim 1, its feature exists
In：The wideband light source is from the wideband light source that wave-length coverage is 1520~1610nm.
4. a kind of insensitive temperature sensor of pulling force based on Sagnac principle according to claim 1, its feature exists
In：The core diameter of the single-mode fiber is 9 μm, 125 μm of cladding diameter；The length of PbS optical fiber is that 8mm, core diameter are 9 μ
125 μm of m, cladding diameter.
5. a kind of insensitive temperature sensor of pulling force based on Sagnac principle according to claim 1, its feature exists
In：The three-dB coupler test wavelength is 1550nm, and bandwidth of operation is 1530nm~1570nm.
6. a kind of insensitive temperature sensor of pulling force based on Sagnac principle according to claim 1, its feature exists
In：The spectrometer communication band is 1200~2400nm, and resolution ratio is 0.02nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758902A (en) * | 2021-08-24 | 2021-12-07 | 比羿激光科技(湖州)有限公司 | Based on WO3Sagnac interference type optical fiber hydrogen sensor |
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| US20060109476A1 (en) * | 2004-11-23 | 2006-05-25 | Lockheed Martin Corporation | Bessel beam interferometer and measurement method |
| CN201555672U (en) * | 2009-12-07 | 2010-08-18 | 中国计量学院 | High-birefringence fiber loop mirror temperature sensor based on PCF-LPG and optical filter intensity demodulation |
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| CN113758902A (en) * | 2021-08-24 | 2021-12-07 | 比羿激光科技(湖州)有限公司 | Based on WO3Sagnac interference type optical fiber hydrogen sensor |
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Application publication date: 20171020 |