CN105716755A - Sensitivity enhanced sensor based on Loyt-Sagnac interferometer - Google Patents
Sensitivity enhanced sensor based on Loyt-Sagnac interferometer Download PDFInfo
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- CN105716755A CN105716755A CN201610049541.2A CN201610049541A CN105716755A CN 105716755 A CN105716755 A CN 105716755A CN 201610049541 A CN201610049541 A CN 201610049541A CN 105716755 A CN105716755 A CN 105716755A
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- 230000035945 sensitivity Effects 0.000 title claims abstract description 18
- 239000000835 fiber Substances 0.000 claims abstract description 38
- 230000010287 polarization Effects 0.000 claims abstract description 17
- 238000001228 spectrum Methods 0.000 claims abstract description 11
- 239000013307 optical fiber Substances 0.000 claims description 42
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
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- 230000003287 optical effect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
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- 238000011160 research Methods 0.000 description 2
- 230000001953 sensory effect Effects 0.000 description 2
- 230000003595 spectral effect Effects 0.000 description 2
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- 238000005286 illumination Methods 0.000 description 1
- 238000002329 infrared spectrum Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/24—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet
- G01L1/242—Measuring force or stress, in general by measuring variations of optical properties of material when it is stressed, e.g. by photoelastic stress analysis using infrared, visible light, ultraviolet the material being an optical fibre
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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
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Abstract
The invention discloses a sensitivity enhanced sensor based on a Loyt-Sagnac interferometer. The sensor is characterized in that a laser beam emitted by a broadband light source is input to a coupler 3 via an optical isolator 2, the coupler divides light waves into two paths transmitted in different directions, the light transmitted in the clockwise direction passes a first polarization controller 4, a reference fiber 5, a single-mode fiber 6, a second polarization controller 7 and a sensing fiber 8 in a loop, the light transmitted in the anticlockwise direction passes the sensing fiber 8, the second polarization controller 7, the single-mode fiber, the reference fiber and the first polarization controller 4, the length difference between the reference fiber and the sensing fiber is 10%, the two light beams pass the loop again, reach the coupler 3 and output coherently, and output light is received by a spectrum analyzer 9 for subsequent analysis. A new interferometer structure uses two high-birefringence fibers (the reference fiber 5 and the sensing fiber 8) of different lengths to generate a vernier effect, the measuring precision can be effectively improved, the structure is simple, preparation is easy, the cost is low, and the sensitivity enhanced sensor has potential in high-precision physical quantity sensing.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, be specifically related to a kind of spirit based on Loyt-Sagnac interferometer structure
Sensitivity enhanced sensor.
Background technology
Along with the development of optical fiber technology, optical fiber Sagnac interferometer more comes in the effect of fiber optic communication and sensory field of optic fibre
The most important.Optical fiber Sagnac interferometer has simple in construction, highly reliable, electromagnetism interference, and precision advantages of higher exists in recent years
Sensory field of optic fibre has a wide range of applications.Fibre Optical Sensor based on interference technique has widely in various physical quantities
Application, including pressure, stress, temperature, electric current and distortion sensing etc..Its primary structure includes that MZ interferometer, Michelson interfere
Instrument and Sagnac interferometer.Fibre Optical Sensor based on interference technique, sensing arrangement is more flexible, highly sensitive, is sensor
An important research direction.
One section of high birefringence optical fiber is placed in Sagnac ring and constitutes based on high birefringence optical fiber Sagnac interferometer, this knot
Structure can carry out Application in Sensing.The most also have a lot about light sensor based on high birefringence optical fiber Sagnac ring
Research and report.At Starodumov in 1977 et al., it being used for temperature sensing, Delarosa will near infrared spectrum
It is used for temperature sensing, and the same year, it was used for stress sensing by Campbell etc..Within 2004, occur in that based on protecting inclined photonic crystal light
Fine Sagnac interferometer sensor, the sensor for temperature of this structure is insensitive；Da-Peng Zhou in 2008 et al. proposes
Add in Sagnac ring after connecting with optical fiber Bragg and high birefringence optical fiber and distinguish temperature and strain simultaneously.Above base
Transducer sensitivity in Sagnac ring is affected can not be substantially improved again by structure.
Summary of the invention
In view of the above deficiency of prior art, it is an object of the invention to provide a kind of based on the spirit of Loyt-Sagnac interferometer
Sensitivity enhanced sensor structure, makes it to be greatly improved the sensitivity of sensing physical quantity, and it is by following technical scheme
Realize:
Sensitivity enhanced sensor based on Loyt-Sagnac interferometer: wideband light source 1 is launched laser beam and passed through
Optoisolator 2 enters bonder 3；Light wave is divided into the ripple that two bundles transmit in opposite direction by bonder, wherein passes clockwise
Defeated light is respectively by the first Polarization Controller 4 in loop, reference optical fiber 5, single-mode fiber the 6, second Polarization Controller 7 and biography
Photosensitive fine 8；And the light counterclockwise transmitted is respectively through sensor fibre the 8, second Polarization Controller 7, single-mode fiber 6, reference
Optical fiber 5 and the first Polarization Controller 4；Reference optical fiber differs 10% with the length of sensor fibre；Two-beam after loop again
Arriving the relevant output of bonder 3, output light carries out subsequent analysis after spectroanalysis instrument 9 receives.
The key component of the present invention is Loyt-Sagnac ring, is one and is differed by bonder, two PC and two segment length
The high birefringence optical fiber composition of 10%.The light that wideband light source sends enters bonder through optoisolator, and light wave is divided into by bonder
Two restraint the ripple transmitted in opposite direction, arrive again at coupling by the Polarization Controller in loop and high birefringence optical fiber respectively
Device, relevant output.For conventional single-stage high birefringence optical fiber Sagnac ring, the free spectral range (fsr) of its output spectrum is:
Fsr=λ2/BL
Wherein B and L is respectively birefringence and the length of high birefringence optical fiber, and λ is operation wavelength.Loyt-Sagnac ring
The envelope cycle of output spectrum is:
Wherein fsrsensorAnd fsrreferenceIt is respectively the free spectrum width that sensor fibre is corresponding with reference optical fiber.Extraneous
Physical quantity (temperature, stress etc.) change will cause the peak wavelength drift of the spectral envelope of Loyt-Sagnac interferometer sensor.
Under the same terms, its wavelength shift adds a fsr compared to single hop high birefringence optical fiber Sagnac sensorreference/
|fsrsensor-fsrreference| the factor, i.e. sensitivity improve fsrreference/|fsrsensor-fsrreference| times.
The high birefringence optical fiber (reference optical fiber and sensor fibre) of two segment length differences 10% can produce cursor effect, they
The rule of two different cycles of corresponding cursor effect.Wherein reference optical fiber is equivalent to the scale inside slide gauge, sensing
Vernier inside optical fiber correspondence slide gauge.Cursor effect is utilized to be capable of multiple physical quantity (temperature, stress, pressure etc.)
High-acruracy survey
Further, in Loyt-Sagnac ring-a section single-mould fiber 6 on apply a twist angle, sensing can be changed
The fringe visibility of device output spectrum, thus can realize the sensing to distortion.
Use the structure of the present invention, on the basis of common Sagnac ring, in ring, increase by one section of high birefringence optical fiber set
Meter makes Loyt-Sagnac interferometer structure, is optimized the length of beam incident angle and high birefringence optical fiber, utilizes
The cursor effect of Loyt-Sagnac interferometer structure, is greatly improved the sensitivity of sensing physical quantity, can realize surveyed physical quantity
High-acruracy survey, simple in construction, low cost, is easily achieved.
Accompanying drawing explanation
Fig. 1 is structural representation based on Loyt-Sagnac interferometer sensitivity enhanced sensor.
Fig. 2 is the spectrogram that Loyt-Sagnac interferometer sensor exports at different temperatures.
Fig. 3 is the temperature of Loyt-Sagnac interferometer sensor and conventional single-stage high birefringence optical fiber Sagnac ring sensor
Degree response curve contrast.Wherein Fig. 3 a is the response curve of single hop Sagnac ring interferometer temperature sensor, and Fig. 3 b is the present invention
Use the response curve of the temperature sensor of Loyt-Sagnac interferometer.
Fig. 4 is Loyt-Sagnac interferometer sensor curve under different twist angles after output spectrum FFT.
Fig. 5 is the distortion response of inventive sensor.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings.
Fig. 1 is the installation drawing of sensitivity enhanced sensor based on Loyt-Sagnac interferometer, and wideband light source 1 is launched
Going out laser beam, a width of 60nm of wideband light source band used in experiment, light enters bonder 3, bonder through optoisolator 2
Light wave is divided into the ripple that two bundles transmit in opposite direction, and wherein the light of transmission clockwise is inclined by first in loop respectively
Shake controller 4, reference optical fiber 5, single-mode fiber the 6, second Polarization Controller 7 and sensor fibre 8, and the light counterclockwise transmitted
Respectively through sensor fibre the 8, second Polarization Controller 7, single-mode fiber 6, reference optical fiber 5 and the first Polarization Controller 4, two-beam
Arriving again at the relevant output of bonder 3 after loop, output light is analyzed after being received by spectroanalysis instrument 9.
Main innovation point of the present invention is to propose the sensor of a kind of Loyt-Sagnac interferometer structure, to Loyt-
The length of the two sections of high birefringence optical fibers (reference optical fiber 5 and sensor fibre 8) in Sagnac ring is optimized design, improves this
Sensitivity when structure is used as sensor.The transfer function of this structure is:
WhereinWithThe phase place caused by the high birefringence optical fiber of two sections of different lengths for light is changed.θ1、θ2And θ3For
Equivalent angle between incident illumination and emergent light and polarization axle.
In practical operation, the high birefringence optical fiber of 2m is reference optical fiber, keeps each physical quantity of its place environment not
Become；These refraction optical fiber high double of 2.2m are sensor fibre, when some physical quantitys (temperature, stress, pressure) of its local environment become
During change, the birefringence of high birefringence optical fiber can change Δ B, the phase contrast that now sensor fibre causesIt is represented by:
Wherein B is the birefringence of high birefringence optical fiber, and L is the length of high birefringence optical fiber, and λ is operation wavelength.Change
Change and will cause the drift of output spectrum peak wavelength, realize the sensing to change physical quantity according to the drift value of wavelength.
Sensor output spectrum during the sensor fibre local environment variations in temperature that Fig. 2 show in Solc-Sagnac ring.Real
It appeared that along with the rising of temperature, the peak wavelength of output spectrum drifts about to short wavelength direction in testing.Fig. 3 is that temperature-responsive is bent
Line, conventional single-stage high birefringence optical fiber Sagnac ring interferometer temperature sensor sensitivity is-1.46nm/ DEG C, and uses Loyt-
The temperature sensing sensitivity of Sagnac interferometer has brought up to-17.99nm/ DEG C.
The single-mode fiber that a segment length is 32.5cm 6 between Loyt-Sagnac ring internal reference optical fiber 5 and sensor fibre 8
One twist angle of upper applying, will change the θ in sensor output expression formula2Value, the change of this value can affect whole output light
The fringe visibility of spectrum, as shown in Figure 4.Its distortion response is as shown in Figure 5.
Claims (2)
1. a sensitivity enhanced sensor based on Loyt-Sagnac interferometer, its characteristic is, wideband light source 1 is launched
Go out laser beam and enter bonder (3) through optoisolator (2)；Light wave is divided into what two bundles transmitted in opposite direction by bonder
Ripple, wherein the light of transmission clockwise is respectively by the first Polarization Controller (4) in loop, reference optical fiber (5), single-mode optics
Fine (6), the second Polarization Controller (7) and sensor fibre (8)；And the light counterclockwise transmitted respectively through sensor fibre (8),
Second Polarization Controller (7), single-mode fiber (6), reference optical fiber (5) and the first Polarization Controller (4)；Reference optical fiber (5) and biography
Photosensitive fibre (8) is the high birefringence optical fiber of same type, its length difference 10%；Two-beam arrives again at coupling after loop
The relevant output of device (3), output light carries out subsequent analysis after spectroanalysis instrument (9) receives.
Sensitivity enhanced sensor based on Loyt-Sagnac interferometer the most according to claim 1, its characteristic exists
In, the single-mode fiber (6) in Loyt-Sagnac ring is upper applies a twist angle, can change the striped of sensor output spectrum
Visibility, and then realize the sensing to distortion.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830947A (en) * | 2017-10-20 | 2018-03-23 | 黑龙江工程学院 | A kind of spectrographic detection temperature sensor connected based on Sagnac rings with FP chambers |
| CN109342327A (en) * | 2018-11-20 | 2019-02-15 | 东北大学 | Novel micro nanometer high birefringence Sagnac optical fiber biosensor |
| CN110243511A (en) * | 2019-06-28 | 2019-09-17 | 暨南大学 | A kind of high sensitivity optical fiber Fabry Perot strain gauge and its method for sensing |
| CN110558957A (en) * | 2019-08-21 | 2019-12-13 | 武汉凯锐普信息技术有限公司 | vital sign monitoring device and method |
| CN112666503A (en) * | 2021-01-07 | 2021-04-16 | 南京信息工程大学 | Parallel double-M-Z optical fiber magnetic sensing device and manufacturing method thereof |
| CN112816096A (en) * | 2021-03-08 | 2021-05-18 | 杭州电子科技大学 | Cascade interferometer optical fiber temperature sensor based on vernier effect |
| CN113074830A (en) * | 2021-03-23 | 2021-07-06 | 广东海洋大学 | Optical fiber temperature sensor, sensing head structure and preparation method |
| CN113091603A (en) * | 2021-04-01 | 2021-07-09 | 深圳大学 | Interference device with adjustable free spectral range |
| CN113686460A (en) * | 2021-03-17 | 2021-11-23 | 广东工业大学 | Fiber grating temperature sensor and sensing device based on vernier effect |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101852656A (en) * | 2010-06-02 | 2010-10-06 | 中国计量学院 | High-sensitivity temperature sensor and device based on partially-perfused HiBi-PCF-FLM (Highly Birefringent-Photonic Crystal Fiber-Fiber Loop Mirror) |
| KR20110075680A (en) * | 2009-12-28 | 2011-07-06 | 한국철도기술연구원 | Apparatus and method of distributed fiber sensor using brillouin optical time domain analysis based on brillouin dynamic grating |
| 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 |
| CN102410990A (en) * | 2011-08-01 | 2012-04-11 | 暨南大学 | High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof |
| CN103134627A (en) * | 2011-11-30 | 2013-06-05 | 中国计量学院 | Temperature insensitive stress sensor based on low birefringence polarization maintaining fiber loop mirror (PM-FLM) |
-
2016
- 2016-01-25 CN CN201610049541.2A patent/CN105716755B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20110075680A (en) * | 2009-12-28 | 2011-07-06 | 한국철도기술연구원 | Apparatus and method of distributed fiber sensor using brillouin optical time domain analysis based on brillouin dynamic grating |
| CN101852656A (en) * | 2010-06-02 | 2010-10-06 | 中国计量学院 | High-sensitivity temperature sensor and device based on partially-perfused HiBi-PCF-FLM (Highly Birefringent-Photonic Crystal Fiber-Fiber Loop Mirror) |
| 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 |
| CN102410990A (en) * | 2011-08-01 | 2012-04-11 | 暨南大学 | High-sensitivity micro-nano optical fiber refractive index sensor and preparation method thereof |
| CN103134627A (en) * | 2011-11-30 | 2013-06-05 | 中国计量学院 | Temperature insensitive stress sensor based on low birefringence polarization maintaining fiber loop mirror (PM-FLM) |
Non-Patent Citations (1)
| Title |
|---|
| 张亮: "基于游标效应和光程差放大的光纤传感增敏机理研究", 《万方数据》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107830947A (en) * | 2017-10-20 | 2018-03-23 | 黑龙江工程学院 | A kind of spectrographic detection temperature sensor connected based on Sagnac rings with FP chambers |
| CN107830947B (en) * | 2017-10-20 | 2018-09-07 | 黑龙江工程学院 | One kind is based on Sagnac rings and the concatenated spectrographic detection temperature sensor of FP chambers |
| CN109342327A (en) * | 2018-11-20 | 2019-02-15 | 东北大学 | Novel micro nanometer high birefringence Sagnac optical fiber biosensor |
| CN110243511A (en) * | 2019-06-28 | 2019-09-17 | 暨南大学 | A kind of high sensitivity optical fiber Fabry Perot strain gauge and its method for sensing |
| CN110558957A (en) * | 2019-08-21 | 2019-12-13 | 武汉凯锐普信息技术有限公司 | vital sign monitoring device and method |
| CN112666503A (en) * | 2021-01-07 | 2021-04-16 | 南京信息工程大学 | Parallel double-M-Z optical fiber magnetic sensing device and manufacturing method thereof |
| CN112816096A (en) * | 2021-03-08 | 2021-05-18 | 杭州电子科技大学 | Cascade interferometer optical fiber temperature sensor based on vernier effect |
| CN112816096B (en) * | 2021-03-08 | 2024-06-07 | 杭州电子科技大学 | Cascade interferometer optical fiber temperature sensor based on vernier effect |
| CN113686460A (en) * | 2021-03-17 | 2021-11-23 | 广东工业大学 | Fiber grating temperature sensor and sensing device based on vernier effect |
| CN113686460B (en) * | 2021-03-17 | 2024-01-23 | 广东工业大学 | Fiber bragg grating temperature sensor and sensing device based on vernier effect |
| CN113074830A (en) * | 2021-03-23 | 2021-07-06 | 广东海洋大学 | Optical fiber temperature sensor, sensing head structure and preparation method |
| US11761827B2 (en) | 2021-03-23 | 2023-09-19 | Guangdong Ocean University | Fiber optic temperature sensor and sensing head structure |
| CN113091603A (en) * | 2021-04-01 | 2021-07-09 | 深圳大学 | Interference device with adjustable free spectral range |
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