CN101813459A - Temperature-compensated optical fiber sagnac interference ring strain sensor - Google Patents
Temperature-compensated optical fiber sagnac interference ring strain sensor Download PDFInfo
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Abstract
The invention relates to a temperature-compensated optical fiber sagnac interference ring strain sensor in the technical field of optical fiber sensing, which comprises an Hi-Bi sagnac interference ring, an optical fiber micro-ring resonator, an optical precision displacement platform, a light source and a spectrum analyzer, wherein the light source is connected with the optical fiber micro-ring resonator, the Hi-Bi sagnac interference ring is connected with the optical fiber micro-ring resonator, the optical fiber micro-ring resonator is connected with the spectrum analyzer, and the Hi-Bi sagnac interference ring is arranged on the optical precision displacement platform; the Hi-Bi sagnac interference ring comprises a coupler, a polarization controller and a birefringent optical fiber, wherein the birefringent optical fiber is used as a sensing arm and simultaneously placed in a temperature field and a strain field; and the optical fiber micro-ring resonator comprises a substrate and a polymer optical fiber ring, wherein the polymer optical fiber ring is only placed in the temperature field for temperature compensation. The invention effectively solves the cross sensitivity problem of the temperature and the strain and has small size, simple structure, low cost and high measuring sensitivity.
Description
Technical field
What the present invention relates to is a kind of device of technical field of optical fiber sensing, specifically be a kind of optical fiber high birefringence sagnac interference ring (High birefringent sagnac loop with temperature compensation, Hi-Bi sagnac loop, high birefringence Sagnac interference ring) strain transducer.
Background technology
In recent years, the application of optical fiber sagnac interference ring aspect sensing more and more causes people's attention.In the optical fiber sagnac interference ring sensing scheme, high birefringence optical fiber sagnac ring has great application prospect at sensory field of optic fibre.Hi-Bi sagnac (high birefringence Sagnac) interference ring is one section hi bi birefringence fiber of series connection in basic sagnac ring, output spectrum presents periodic filtering characteristic, the double refractive inde and the length of Hi-Bi optical fiber during the cycle of output spectrum is decided by to encircle, and irrelevant with the length of ring.As pickup arm, when changes such as external environment parameters such as temperature, strain, refractive index acted on pickup arm, the length of Hi-Bi optical fiber and double refractive inde all changed, and cause output spectrum generation wave length shift with this section high birefringence optical fiber.The sensing sensitivity of Hi-Bisagnac interference ring is higher, and (for example common fiber grating is only had an appointment 0.01nm/ ℃ to the sensitivity coefficient of temperature, long period fiber grating can reach 0.1nm/ ℃ to the susceptibility of temperature, and the susceptibility that Hi-Bi sagnac encircles temperature can reach 1nm/ ℃); Hi-Bi sagnac ring also has advantages such as input polarisation of light independence, simple in structure and cost are lower in addition.
In the actual optical fiber sensing monitoring system, the cross sensitivity of each parameter is a unavoidable key issue, influence when promptly measurement result is subjected in the external environment condition a plurality of parameter easily.In for example common fiber-optic grating sensor, the variation of wavelength signals is subjected to temperature and stress influence simultaneously.Therefore the influence that how a plurality of parameters is caused makes a distinction the key that becomes sensing signal demodulation, otherwise other performances such as measuring accuracy, measurement range, reaction time all will become empty talk.Interfere ring-like sensor that this problem puzzlement is arranged equally to Hi-Bi sagnac, temperature and strain all can cause the wave length shift of output spectrum.So the temperature cross sensitivity problem in the research transducing signal is of great immediate significance and application prospect to the practicability of following this type sensor.
Through existing literature search is found, 2007, O.Frazao, J.L.Santos, people such as J.M.Baptista have delivered the article that is entitled as " Strain and temperaturediscrimination using concatenated high-birefringence fiber loop mirrors (strain and temperature based on Cascade H i-Bi fiber loop mirror are distinguished) " at " IEEEPhotonics Technology Letter (IEEE fibreoptics wall bulletin) ", the Hi-Bi fiber optic loop of two cascades that adopted this article realizes the differentiation to temperature and strain, a Hi-Bi ring is as pickup arm in this technology, and another Hi-Bi ring utilizes the sensitivity different cross sensitivity problems that solve temperature to strain of two rings to strain and temperature as the temperature reference arm.But this technical size is bigger, is unfavorable for actual measurement.
Find by retrieval again, 2008, Frazao, O., people such as D.Egypto have delivered " Strain and temperature discrimination usinghigh-birefringence erbium-doped fiber loop mirror with high pump power laser (stress of the high birefringence Er-doped fiber ring mirror of high power pump and temperature are distinguished) " on " IEEE Photonics Technology Letter (IEEE fibreoptics wall bulletin) ", this technology is taked one section special er-doped high birefringence optical fiber of series connection in the sagnac interference ring, adding wavelength in the sagnac ring is the pumping source of 980nm, utilization adds the pump light front and back Hi-Bi EDF sensitivity difference of parameter to external world, realizes distinguishing the purpose of temperature and strain.But the stability of pump light also can affect greatly measurement result after the interior adding of this technology ring pump light source, makes the measurement result accuracy rate very low.
Also find by retrieval, 2009, hun-Liu, Z., people such as Z.Jiarong are at " Optics Communication, (optical communication) " on delivered the article that is entitled as " Simultaneous strain and temperature measurement using a highlybirefringence fiber loop mirror and a long-period grating written in a photonic crystal fiber (based on the strain and the temperature simultaneously measuring of etching long period fiber grating on high birefringence ring mirror and the photonic crystal fiber) ", this technology adopts one section special photonic crystal fiber long-period gratings (Long-period Grating written in a PhotonicCrystal Fiber, PCF LPG) as temperature compensation, Hi-Bi sagnac interference ring is as pickup arm, PCF LPG then plays the effect of wave filter, as long as it is proper that the output spectra of ring and the two window of the transmission spectrum of PCF LPG are selected, then can monitor wave length shift and variable power that certain crest changes with external parameter.Can measure the variation of temperature and strain simultaneously by the monitoring of wavelength and power.But the PCF LPG that this technology adopts preparation needs expensive equipment, cost height and system complex.
Summary of the invention
The objective of the invention is to overcome above shortcomings in the prior art, a kind of optical fiber sagnac interference ring strain transducer with temperature compensation is provided.The present invention cascades up polymer optical fiber micro-ring resonant cavity and Hi-Bi sagnac interference ring as the fibre strain sensor, can get rid of temperature cross sensitivity problem, and is simple in structure, size is little, and cost is low, thereby realizes that highly sensitive strain parameter measures.
The present invention is achieved by the following technical solutions:
The present invention includes: Hi-Bi sagnac interference ring, optical fiber micro-ring resonant cavity, optical precision displacement platform, light source and spectroanalysis instrument, wherein: the light source transmitting optical signal that links to each other with the optical fiber micro-ring resonant cavity, the Hi-Bi sagnac interference ring light signal of transmission after interfering that link to each other with the optical fiber micro-ring resonant cavity, the optical fiber micro-ring resonant cavity links to each other with spectroanalysis instrument and transmits the light signal that passes through after external environment influences, and Hi-Bi sagnac interference ring is arranged on the optical precision displacement platform.
Described optical precision displacement platform is the four-dimensional adjusting bracket of optical precision.
The bandwidth range of described light source is: 1525nm-1570nm.
Described Hi-Bi sagnac interference ring comprises: coupling mechanism, Polarization Controller and birefringence fiber, wherein: the coupling mechanism transmitting optical signal that links to each other with Polarization Controller, the light source transmitting optical signal that links to each other with coupling mechanism, Polarization Controller links to each other with an end of birefringence fiber and transmits ring internal interference information, the other end of birefringence fiber links to each other transmission through the optical information behind the high birefringence optical fiber with coupling mechanism, coupling mechanism links to each other transmission through the output information behind the interference ring with the optical fiber micro-ring resonant cavity, birefringence fiber is fixed on the optical precision displacement platform.
Described birefringence fiber places temperature field and strain field simultaneously, as pickup arm.
Described optical fiber micro-ring resonant cavity comprises: substrate and polymer optical fiber ring, wherein: the polymer optical fiber ring is arranged on the substrate, one end of polymer optical fiber ring links to each other transmission through the interference information behind the interference ring with Hi-Bi sagnac interference ring, the other end of polymer optical fiber ring links to each other with spectroanalysis instrument and transmits the light signal that is loaded with heat transfer agent.
Described substrate is the magnesium fluoride substrate, or plates magnesium fluoride film on the quartz substrate.
Described polymer optical fiber ring adopts polymethyl methacrylate materials to make, and it places the temperature field, as the temperature reference arm.
The diameter range of described polymer optical fiber ring is: 100 μ m-200 μ m.
Compared with prior art, the present invention has following beneficial effect: polymer optical fiber micro-ring resonant cavity and Hi-Bi sagnac interference ring are cascaded up as the fibre strain sensor, can effectively solve the cross sensitivity problem of temperature and strain; Because Hi-Bi sagnac interference ring and polymer optical fiber micro-ring resonant cavity all have highly sensitive advantage, so being combined with of the two help give full play to the two highly sensitive advantage, makes the high sensitivity optical fiber strain transducer; The device that is adopted among the present invention all belongs to conventional device, and size is little, simple in structure, and the polymethyl methacrylate materials of preparation polymer optical fiber ring is cheap, so cost of the present invention is very low.
Description of drawings
Fig. 1 is that the structure of embodiment is formed synoptic diagram;
Wherein: 1-optical fiber micro-ring resonant cavity, the four-dimensional adjusting bracket of 2-optical precision, 3-light source, 4-spectroanalysis instrument, 5-3dB coupling mechanism, 6-Polarization Controller, 7-birefringence fiber.
Fig. 2 is that the structure of embodiment optical fiber micro-ring resonant cavity is formed synoptic diagram;
Wherein: 8-magnesium fluoride substrate, 9-polymer optical fiber ring, the 10-first fused tapered single-mode fiber, the 11-second fused tapered single-mode fiber.
Embodiment
Below in conjunction with accompanying drawing embodiments of the invention are elaborated: present embodiment has provided detailed embodiment and process being to implement under the prerequisite with the technical solution of the present invention, but protection scope of the present invention is not limited to following embodiment.
Embodiment
As shown in Figure 1, present embodiment comprises: Hi-Bi sagnac interference ring, optical fiber micro-ring resonant cavity 1, the four-dimensional adjusting bracket 2 of optical precision, light source 3 and spectroanalysis instrument 4, wherein: light source 3 transmitting optical signal that links to each other with optical fiber micro-ring resonant cavity 1, the Hi-Bi sagnac interference ring light signal of transmission after interfering that link to each other with optical fiber micro-ring resonant cavity 1, optical fiber micro-ring resonant cavity 1 links to each other with spectroanalysis instrument 4 and transmits the light signal that passes through after external environment influences, and Hi-Bi sagnac interference ring is arranged on the four-dimensional adjusting bracket 2 of optical precision.
Described Hi-Bi sagnac interference ring comprises: three-dB coupler 5, Polarization Controller 6 and birefringence fiber 7, wherein: the transmitting optical signal that links to each other with Polarization Controller 6 of three-dB coupler 5, light source 3 transmitting optical signal that links to each other with three-dB coupler 5, Polarization Controller 6 links to each other with an end of birefringence fiber 7 and transmits ring internal interference information, the other end of birefringence fiber 7 links to each other transmission through the information behind the high birefringence optical fiber with three-dB coupler 5, three-dB coupler 5 links to each other transmission through the output information behind the interference ring with optical fiber micro-ring resonant cavity 1, birefringence fiber 7 is fixed on the four-dimensional adjusting bracket 2 of optical precision.
The diameter that described birefringence fiber 7 adopts Jiangsu Fa Er to win the production of optical communication company is " one " font polarization maintaining optical fibre of 80 μ m, and it is 9.33 * 10 at 1550nm band dual refraction coefficient
-4, birefringence fiber 7 places temperature field and strain field simultaneously, as pickup arm.
As shown in Figure 2, described optical fiber micro-ring resonant cavity 1 comprises: magnesium fluoride substrate 8 and polymer optical fiber ring 9, wherein: an end of polymer optical fiber ring 9 links to each other transmission through the interference information behind the interference ring by the first fused tapered single-mode fiber 10 with three-dB coupler 5, the other end of polymer optical fiber ring 9 links to each other with spectroanalysis instrument 4 by the second fused tapered single-mode fiber 11 and transmits the light signal that is loaded with heat transfer agent, and the integration region of polymer optical fiber ring 9 and polymer optical fiber ring 9 and two fused tapered single-mode fibers all is fixed on the magnesium fluoride substrate 8.
Described polymer optical fiber ring 9 adopts polymethyl methacrylate materials to make, and it places the temperature field, as the temperature reference arm.
The diameter of described polymer optical fiber ring 9 is: 120 μ m.
Described light source 3 adopts the ASE light source, and its light source scope is: 1525nm-1570nm.
Described spectroanalysis instrument 4 adopts Anristu Ms9710B type spectroanalysis instrument.
The course of work of present embodiment is:
1) by adjusting the Polarization Controller 6 in the Hi-Bi sagnac interference ring, adjust the output spectrum of Hi-Bi sagnac interference ring, select suitable resonance wavelength, make a certain resonance wavelength of Hi-Bi sagnac interference ring and the resonance wavelength of optical fiber micro-ring resonant cavity 1 make a distinction, promptly can clearly observe the resonance wavelength of the two at spectroanalysis instrument 4 places.
2) make that strain variation is zero, the temperature value change Delta T obtains the temperature variant wavelength shift Δ of the resonance wavelength λ of Hi-Bi sagnac interference ring respectively
1With the temperature variant wavelength shift Δ of the resonance wavelength of optical fiber micro-ring resonant cavity 1 λ
2, and then according to Δ λ
1=K
1TΔ T and Δ λ
2=K
2TΔ T obtains the sensitivity coefficient K of Hi-Bi sagnac interference ring to temperature
1TSensitivity coefficient K with 1 pair of temperature of optical fiber micro-ring resonant cavity
2T
3) make that temperature variation is zero, strain value changes delta ε obtains the drift value Δ λ of Hi-Bi sagnac interference ring resonance wavelength to strain value
1, and then according to Δ λ
1=K
εΔ ε obtains the sensitivity coefficient K of Hi-Bi sagnac interference ring to strain variation
ε
4) according to the sensitivity coefficient K of Hi-Bi sagnac interference ring to temperature
1T, 1 pair of temperature of optical fiber micro-ring resonant cavity sensitivity coefficient K
2TWith the sensitivity coefficient K of Hi-Bi sagnac interference ring to strain variation
ε, obtain the calibration formula of temperature and strain, specifically:
ΔT＝Δλ
2/K
2T
Δε＝(Δλ
1-K
1TΔT)/K
ε°
Present embodiment is respectively 1.08nm/ ℃ and 0.95nm/ μ ε to the sensitivity of temperature and strain, has improved an order of magnitude than existing fiber-optic grating sensor sensitivity, and simple in structure, cost is low.
Claims (6)
1. optical fiber sagnac interference ring strain transducer with temperature compensation, comprise: Hi-Bi sagnac interference ring, optical precision displacement platform, light source and spectroanalysis instrument, it is characterized in that, also comprise: the optical fiber micro-ring resonant cavity, wherein: the light source transmitting optical signal that links to each other with the optical fiber micro-ring resonant cavity, the Hi-Bi sagnac interference ring light signal of transmission after interfering that link to each other with the optical fiber micro-ring resonant cavity, the optical fiber micro-ring resonant cavity links to each other with spectroanalysis instrument and transmits the light signal that passes through after external environment influences, and Hi-Bi sagnac interference ring is arranged on the optical precision displacement platform;
Described optical fiber micro-ring resonant cavity comprises: substrate and polymer optical fiber ring, wherein: the polymer optical fiber ring is arranged on the substrate, one end of polymer optical fiber ring links to each other transmission through the interference information behind the interference ring with Hi-Bi sagnac interference ring, the other end of polymer optical fiber ring links to each other with spectroanalysis instrument and transmits the light signal that is loaded with heat transfer agent.
2. the optical fiber sagnac interference ring strain transducer of band temperature compensation according to claim 1 is characterized in that, described optical precision displacement platform is the four-dimensional adjusting bracket of optical precision.
3. the optical fiber sagnac interference ring strain transducer of band temperature compensation according to claim 1 is characterized in that the bandwidth range of described light source is: 1525nm-1570nm.
4. the optical fiber sagnac interference ring strain transducer of band temperature compensation according to claim 1, it is characterized in that, described Hi-Bi sagnac interference ring comprises: coupling mechanism, Polarization Controller and birefringence fiber, wherein: the coupling mechanism transmitting optical signal that links to each other with Polarization Controller, the light source transmitting optical signal that links to each other with coupling mechanism, Polarization Controller links to each other with an end of birefringence fiber and transmits ring internal interference information, the other end of birefringence fiber links to each other transmission through the optical information behind the high birefringence optical fiber with coupling mechanism, coupling mechanism links to each other transmission through the output information behind the interference ring with the optical fiber micro-ring resonant cavity, birefringence fiber is fixed on the optical precision displacement platform.
5. the optical fiber sagnac interference ring strain transducer of band temperature compensation according to claim 1 is characterized in that described substrate is the magnesium fluoride substrate, or plates magnesium fluoride film on the quartz substrate.
6. the optical fiber sagnac interference ring strain transducer of band temperature compensation according to claim 1 is characterized in that the diameter range of described polymer optical fiber ring is: 100 μ m-200 μ m.
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| CN102183318A (en) * | 2011-03-08 | 2011-09-14 | 上海交通大学 | Two-in-parallel high birefringence optical fiber sagnac interference ring multi-parameter sensor |
| CN103134776A (en) * | 2011-11-30 | 2013-06-05 | 中国计量学院 | Liquid refractive index absolute measurement sensor based on D-type polarization maintaining optical fibre |
| CN103557879A (en) * | 2013-11-01 | 2014-02-05 | 南昌航空大学 | Fiber bragg grating sensing wavelength calibration device based on cavity absorption |
| CN103955147A (en) * | 2014-04-24 | 2014-07-30 | 电子科技大学 | Control device of micro-ring optical switch |
| WO2015161538A1 (en) * | 2014-04-24 | 2015-10-29 | 电子科技大学 | Device for stabilizing spectrum of micro-ring resonator |
| CN105333833A (en) * | 2015-10-27 | 2016-02-17 | 北京航空航天大学 | Temperature-independent fiber bragg grating strain sensor |
| CN105333823A (en) * | 2015-10-22 | 2016-02-17 | 南方科技大学 | Optical fiber displacement sensor |
| CN105651488A (en) * | 2016-03-01 | 2016-06-08 | 河南师范大学 | Measuring method for achieving optical fiber dispersion based on laser beat frequency |
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| CN110631500A (en) * | 2019-09-12 | 2019-12-31 | 南京林业大学 | Online measurement method of birefringent optical fiber loop mirror strain sensor |
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| CN102183318B (en) * | 2011-03-08 | 2013-01-09 | 上海交通大学 | Two-in-parallel high birefringence optical fiber sagnac interference ring multi-parameter sensor |
| CN102183318A (en) * | 2011-03-08 | 2011-09-14 | 上海交通大学 | Two-in-parallel high birefringence optical fiber sagnac interference ring multi-parameter sensor |
| CN103134776A (en) * | 2011-11-30 | 2013-06-05 | 中国计量学院 | Liquid refractive index absolute measurement sensor based on D-type polarization maintaining optical fibre |
| CN103134776B (en) * | 2011-11-30 | 2015-05-06 | 中国计量学院 | Liquid refractive index absolute measurement sensor based on D-type polarization maintaining optical fibre |
| CN103557879A (en) * | 2013-11-01 | 2014-02-05 | 南昌航空大学 | Fiber bragg grating sensing wavelength calibration device based on cavity absorption |
| CN103557879B (en) * | 2013-11-01 | 2016-01-06 | 南昌航空大学 | Based on the optical fiber grating sensing Wavelength calibration device that chamber absorbs |
| CN103955147B (en) * | 2014-04-24 | 2016-06-22 | 电子科技大学 | A kind of control device of micro-loop photoswitch |
| CN103955147A (en) * | 2014-04-24 | 2014-07-30 | 电子科技大学 | Control device of micro-ring optical switch |
| WO2015161538A1 (en) * | 2014-04-24 | 2015-10-29 | 电子科技大学 | Device for stabilizing spectrum of micro-ring resonator |
| CN105333823B (en) * | 2015-10-22 | 2018-02-16 | 南方科技大学 | Optical fiber displacement sensor |
| CN105333823A (en) * | 2015-10-22 | 2016-02-17 | 南方科技大学 | Optical fiber displacement sensor |
| CN105333833A (en) * | 2015-10-27 | 2016-02-17 | 北京航空航天大学 | Temperature-independent fiber bragg grating strain sensor |
| CN105333833B (en) * | 2015-10-27 | 2018-11-02 | 北京航空航天大学 | The unrelated fiber Bragg grating strain sensor of temperature |
| CN105651488A (en) * | 2016-03-01 | 2016-06-08 | 河南师范大学 | Measuring method for achieving optical fiber dispersion based on laser beat frequency |
| CN105651488B (en) * | 2016-03-01 | 2018-10-09 | 河南师范大学 | The measurement method of fibre-optical dispersion is realized based on laser beat frequency |
| CN108827189A (en) * | 2018-06-21 | 2018-11-16 | 南京邮电大学 | A kind of torsion sensor based on reflective micro-nano fiber coupler |
| CN108827189B (en) * | 2018-06-21 | 2024-05-14 | 南京邮电大学 | Torsion sensor based on reflection type micro-nano fiber coupler |
| CN110631500A (en) * | 2019-09-12 | 2019-12-31 | 南京林业大学 | Online measurement method of birefringent optical fiber loop mirror strain sensor |
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