CN102636458A - Interference type refractive index sensor based on polarization maintaining optical fiber - Google Patents
Interference type refractive index sensor based on polarization maintaining optical fiber Download PDFInfo
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- CN102636458A CN102636458A CN201210128563XA CN201210128563A CN102636458A CN 102636458 A CN102636458 A CN 102636458A CN 201210128563X A CN201210128563X A CN 201210128563XA CN 201210128563 A CN201210128563 A CN 201210128563A CN 102636458 A CN102636458 A CN 102636458A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 119
- 230000010287 polarization Effects 0.000 title claims abstract description 101
- 239000000835 fiber Substances 0.000 claims abstract description 47
- 239000000523 sample Substances 0.000 claims abstract description 5
- 238000001228 spectrum Methods 0.000 claims abstract description 5
- 238000005253 cladding Methods 0.000 claims description 7
- 238000006073 displacement reaction Methods 0.000 claims 1
- 229940085805 fiberall Drugs 0.000 claims 1
- 230000035945 sensitivity Effects 0.000 abstract description 10
- 230000003287 optical effect Effects 0.000 description 11
- 238000005388 cross polarization Methods 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- 230000007613 environmental effect Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006854 communication Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
一种基于保偏光纤的干涉型折射率传感器，其特征在于：由宽带光源(1)、阵列偏光器(2)、偏振调节器(3)、保偏光纤(4)、光谱分析仪(5)、连接光纤(6)、入射光纤(7)和出射光纤(8)组成；宽带光源(1)和阵列偏光器(2)通过连接光纤(6)相连，阵列偏光器(2)和保偏光纤(4)分别通过连接光纤(6)和入射光纤(7)与偏振调节器(3)相连，其中入射光纤(7)纤芯的中心与保偏光纤(4)纤芯的中心对齐相连，保偏光纤(4)再通过出射光纤(8)连接光谱分析仪(5)，而其中保偏光纤(2)纤芯的中心与出射光纤(8)纤芯的中心以错位方式相连；保偏光纤(4)作为测量折射率的传感探头。该装置测量折射率灵敏度高，结构简单，可以应用于各类实际工程中，有很好的应用前景。
An interference type refractive index sensor based on polarization maintaining optical fiber, characterized in that it consists of a broadband light source (1), an array polarizer (2), a polarization adjuster (3), a polarization maintaining optical fiber (4), and a spectrum analyzer (5 ), connecting optical fiber (6), incident optical fiber (7) and outgoing optical fiber (8); broadband light source (1) and array polarizer (2) are connected through connecting optical fiber (6), and array polarizer (2) and polarization maintaining The optical fiber (4) is respectively connected to the polarization adjuster (3) through the connecting optical fiber (6) and the incident optical fiber (7), wherein the center of the core of the incident optical fiber (7) is aligned with the center of the core of the polarization-maintaining optical fiber (4), The polarization-maintaining fiber (4) is connected to the spectrum analyzer (5) through the exit fiber (8), and the center of the core of the polarization-maintaining fiber (2) is connected to the center of the core of the exit fiber (8) in a dislocation manner; The optical fiber (4) serves as a sensing probe for measuring the refractive index. The device has high sensitivity for measuring the refractive index, has a simple structure, can be applied to various practical projects, and has a good application prospect.
Description
Technical field
The invention provides a kind of interfere type index sensor, belong to technical field of optical fiber sensing based on polarization maintaining optical fibre.
Background technology
Polarization maintaining optical fibre can maintain the linear polarization state of the light wave in the communication process that does not have polarization variations.When light wave gets into polarization maintaining optical fibre by single-mode fiber with the fibre core guided mode; If the core diameter of single-mode fiber is greater than the core diameter of polarization maintaining optical fibre; In the fibre core of polarization maintaining optical fibre and covering the identical light wave in polarization direction appears then; Effectively play the effect of beam split, there are two parts that scribble stress material the both sides of the core region of polarization maintaining optical fibre in addition, and they have high birefringence and high-temperature sensitivity.
In traditional single-mode fiber, insert the birefringence polarization maintaining optical fibre as sensor fibre.Be applied to the optical path difference that extraneous index on the sensor fibre has changed the two-way light wave of propagating in the polarization maintaining optical fibre, can realize the measurement of extraneous index through the drift value of monitoring interference spectrum.Have characteristics such as simple in structure, sensitivity height.
Summary of the invention
The object of the present invention is to provide a kind of interfere type index sensor based on polarization maintaining optical fibre.This device can be converted into extraneous index variable quantity to be measured the side-play amount of interference pattern crest.Have characteristics such as simple in structure, easy operating, sensitivity height.
The present invention realizes through following technical scheme:
A kind of interfere type index sensor based on polarization maintaining optical fibre is characterized in that: be made up of wideband light source (1), array polarizer (2), polarization adjuster (3), polarization maintaining optical fibre (4), spectroanalysis instrument (5), connection optical fiber (6), incident optical (7) and outgoing optical fiber (8); Wideband light source (1) links to each other through being connected optical fiber (6) with array polarizer (2); Array polarizer (2) links to each other with polarization adjuster (3) with incident optical (7) through being connected optical fiber (6) respectively with polarization maintaining optical fibre (4); Wherein the center of incident optical (7) fibre core links to each other with the center-aligned of polarization maintaining optical fibre (4) fibre core; Polarization maintaining optical fibre (4) connects spectroanalysis instrument (5) through outgoing optical fiber (8) again, and wherein the center of polarization maintaining optical fibre (2) fibre core links to each other with the dislocation mode with the center of outgoing optical fiber (8) fibre core; Polarization maintaining optical fibre (4) is as the sensing probe of refractive Index Measurement.
Described a kind of interfere type index sensor based on polarization maintaining optical fibre is characterized in that: connecting optical fiber, incident optical and outgoing optical fiber can be general single-mode fiber, and the single-mode fiber core diameter is 9～15um, and cladding diameter is 100～150um.
Described a kind of interfere type index sensor based on polarization maintaining optical fibre, it is characterized in that: the polarization maintaining optical fibre core diameter is 5～8um, and cladding diameter is 50～100um, and birefraction is 2.4 * 10
-4, the length of polarization maintaining optical fibre is about 1cm.
Described a kind of interfere type index sensor based on polarization maintaining optical fibre is characterized in that: the center of the center of polarization maintaining optical fibre (4) fibre core and outgoing optical fiber (8) fibre core is with the welding of dislocation mode.
Described a kind of interfere type index sensor based on polarization maintaining optical fibre; It is characterized in that: the center of the center of polarization maintaining optical fibre (4) fibre core and outgoing optical fiber (8) fibre core is during with dislocation mode welding; The dislocation range of size of outgoing optical fiber (8) fibre core and polarization maintaining optical fibre (4) fibre core is the 0-18 micron, and dislocation direction is the quick shaft direction or the slow-axis direction of polarization maintaining optical fibre.
Principle of work of the present invention is: wideband light source (1) sends light wave; Obtain along the linearly polarized light of specific direction polarization through array polarizer (2) and polarization adjuster (3) respectively; Because the core diameter of incident optical (7) is bigger than the core diameter of polarization maintaining optical fibre (4); When incident optical (7) and polarization maintaining optical fibre (4) are connected with the center-aligned mode of fibre core; Linearly polarized light forms the orthogonal linearly polarized light of two-way polarization in polarization maintaining optical fibre (4); And after in the polarization maintaining optical fibre of length-specific, propagating, there are corresponding phase differential in fibre core and cladding mode, when outgoing optical fiber (8) is connected with the dislocation mode with polarization maintaining optical fibre (4); Two-route polarized light modulation in the polarization maintaining optical fibre (4) interferes when getting into outgoing optical fiber (8); Simultaneously outgoing optical fiber (8) and polarization maintaining optical fibre (4) thus the core centre lateral shift amount may command two linear polarization light intensities visibility that can regulate interference pattern, in spectroanalysis instrument (5), can observe interference pattern, can learn the variation of the peripheral liquid refractivity of polarization maintaining optical fibre (4) through the variation of interference pattern.When polarization maintaining optical fibre (4) liquid refractivity on every side changes; Influence the size of polarization maintaining optical fibre (4) internal stress and birefraction, thereby change the phase differential of two-way light in the polarization maintaining optical fibre (4), the interference pattern that in spectroanalysis instrument (5), shows shows the variation of phase place; Therefore the index of passing through the measure of the change surrounding environment of phase place changes; In addition, because polarization maintaining optical fibre (4) has stronger birefringence sensitivity to environment temperature and variations in refractive index, pass through the light wave of the orthogonal polarization mode that obtains after the modulation of array polarizer (2) and polarization adjuster (3) respectively; After the modulation through polarization maintaining optical fibre (4); The generation different phase changes, and the interference pattern of two orthogonal polarization modes that in spectroanalysis instrument (5), show has the sensitivity of different temperature and environmental index, measures when realizing temperature and environmental index.
The invention has the beneficial effects as follows: this device can the change of refractive of testing liquid be converted into interference pattern phase change; Through Measurement Phase under the reference state and the variation under the state of external environment influence arranged; Extrapolate corresponding refractive index and temperature, measure when more can reach ambient temperature and variations in refractive index; This refractive index has advantages such as simple in structure and sensitivity height simultaneously.
Description of drawings
Fig. 1 is the sensor synoptic diagram of the compact based on polarization maintaining optical fibre of the present invention interference structure in upright arrangement;
Fig. 2 is polarization maintaining optical fibre of the present invention and outgoing optical fiber dislocation welding synoptic diagram;
Fig. 3 is that single-mode fiber of the present invention is displaced sideways corresponding transmitted light spectrogram along the polarization maintaining optical fibre fast and slow axis respectively;
Fig. 4 is the spectrogram of the corresponding different input polarizations of difference of the present invention (cross polarization) pattern;
Fig. 5 is the spectrogram of corresponding different input polarizations (cross polarization) pattern of difference of the present invention and temperature;
Fig. 6 is the corresponding transmitted light spectrogram of variations in refractive index under x of corresponding respectively to of the present invention and the y polarization mode.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is further described:
Referring to accompanying drawing 1; A kind of interfere type index sensor based on polarization maintaining optical fibre is made up of wideband light source (1), array polarizer (2), polarization adjuster (3), polarization maintaining optical fibre (4), spectroanalysis instrument (5), connection optical fiber (6), incident optical (7) and outgoing optical fiber (8); Wideband light source (1) links to each other through being connected optical fiber (6) with array polarizer (2); Array polarizer (2) links to each other with polarization adjuster (3) with incident optical (7) through being connected optical fiber (6) respectively with polarization maintaining optical fibre (4); Wherein the center of incident optical (7) fibre core links to each other with the center-aligned of polarization maintaining optical fibre (4) fibre core; Polarization maintaining optical fibre (4) connects spectroanalysis instrument (5) through outgoing optical fiber (8) again, and wherein the center of polarization maintaining optical fibre (2) fibre core links to each other with the mode that does not line up with the center of outgoing optical fiber (8) fibre core; Polarization maintaining optical fibre (4) is as the sensing probe of measuring the external environment index.
The wideband light source of selecting for use in this instance (1) is that 1550nm, bandwidth are the wideband light source of 200nm with centre wavelength; Connecting optical fiber (6), incident optical (7) and outgoing optical fiber (8) is 9 microns with core diameter all; Cladding diameter is 125 microns a single-mode fiber, and polarization maintaining optical fibre is 1cm as sensing probe length, and the polarization maintaining optical fibre core diameter is 5 microns; Cladding diameter is 100 microns, and birefraction is 2.4 * 10
-4Fig. 3 is that single-mode fiber of the present invention is displaced sideways corresponding transmitted light spectrogram along fast and slow axis respectively; When outgoing optical fiber (8) obtains maximum extinctivity 12.1dB during along 12 microns of the quick shaft direction vertical moving of polarization maintaining optical fibre (4), and outgoing optical fiber (8) is moved further when surpassing apart from 12 microns at polarization maintaining optical fibre center, and the extinctivity of interference fringe reduces gradually; When outgoing optical fiber (8) when the slow-axis direction of polarization maintaining optical fibre (4) moves, the maximum extinctivity of interference fringe is less than 7dB; Fig. 4 is the spectrogram of the corresponding different input polarizations of difference of the present invention (cross polarization) pattern, and the polarization direction is aligned in the slow fast axle of polarization maintaining optical fibre (4) respectively, and the alignment slow axis is the x polarization mode; The fast axle of alignment is y polarization mode, when being transmitted into polarization maintaining optical fibre (4) with the x polarization mode, generates a 21.85nm wavelength difference; Extinctivity is-17.2dB; When being transmitted into polarization maintaining optical fibre (4) with the y polarization mode, generate a 28.98nm wavelength difference, extinctivity is-14.3dB; This shows, polarization maintaining optical fibre based on cross polarization to external world environmental index different sensitivity is arranged; Fig. 5 is the spectrogram of corresponding different input polarizations (cross polarization) pattern of difference of the present invention and temperature; Spending in 130 degree scopes 30 when temperature increases; The crest of interference fringe is linearly toward long wavelength shift, and to record temperature control be 0.115nm/ ℃ for the x polarization mode and be 0.097nm/ ℃ for the y polarization mode; Fig. 6 is the corresponding transmitted light spectrogram of the extraneous liquid refractivity of polarization maintaining optical fibre under x of corresponding respectively to of the present invention and the y polarization mode; When the extraneous liquid refractivity of polarization maintaining optical fibre increases by 1.44 from 1.30; The crest of the interference pattern of corresponding different input polarization states all moves to the shortwave direction; But sensitivity is different, is respectively 46.7nm/RIU and 36.7nm/RIU corresponding to the sensitivity of x polarization mode and y polarization mode.
Claims (5)
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| CN201210128563XA CN102636458A (en) | 2012-04-23 | 2012-04-23 | Interference type refractive index sensor based on polarization maintaining optical fiber |
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| CN201210128563XA CN102636458A (en) | 2012-04-23 | 2012-04-23 | Interference type refractive index sensor based on polarization maintaining optical fiber |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297208A (en) * | 2014-10-21 | 2015-01-21 | 天津理工大学 | Interferometric optical fiber sensor based on pohotonic crystal optical fiber |
| CN104819961A (en) * | 2015-04-23 | 2015-08-05 | 上海大学 | Digital holography system for carrying out online non-destructive measurement on refractive index of special optical fiber |
| CN105092086A (en) * | 2015-09-01 | 2015-11-25 | 河南师范大学 | Dual-coupling structure-based single-mode core-dislocated fiber temperature measurement method |
| CN105571750A (en) * | 2016-03-08 | 2016-05-11 | 武汉理工大学 | Distributed pressure sensing system |
| CN105890828A (en) * | 2014-10-23 | 2016-08-24 | 中国计量学院 | Polarization-dependent embedded fiber M-Z interference type transverse pressure transducer |
| CN111679230A (en) * | 2020-05-25 | 2020-09-18 | 汕头大学 | A Magnetic Field Sensing Device Based on Magnetic Fluid |
| CN116242278A (en) * | 2023-05-11 | 2023-06-09 | 山东高速工程检测有限公司 | Orthogonal optical fiber interference fringe projector for three-dimensional measurement of asphalt pavement texture |
-
2012
- 2012-04-23 CN CN201210128563XA patent/CN102636458A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| BO DONG ET AL.: "Temperature Insensitive All-Fiber Compact Polarization-Maintaining Photonic Crystal Fiber Based Interferometer and Its Applications in Fiber Sensors", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
| JOEL VILLATORO ET AL.: "Optical Fiber Refractive-Index Sensor Based on Core Diameter Mismatch", 《JOURNAL OF LIGHTWAVE TECHNOLOGY》 * |
| ZHAOBING TIAN ET AL.: "In-Line Single-Mode Optical Fiber Interferometric Refractive Index Sensors", 《JOURNAL OF LIGHT WAVE TECHNOLOGY》 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104297208A (en) * | 2014-10-21 | 2015-01-21 | 天津理工大学 | Interferometric optical fiber sensor based on pohotonic crystal optical fiber |
| CN105890828A (en) * | 2014-10-23 | 2016-08-24 | 中国计量学院 | Polarization-dependent embedded fiber M-Z interference type transverse pressure transducer |
| CN105890828B (en) * | 2014-10-23 | 2018-11-16 | 中国计量学院 | A kind of embedded optical fiber M-Z interference-type transverse pressure sensor of polarization correlation |
| CN104819961A (en) * | 2015-04-23 | 2015-08-05 | 上海大学 | Digital holography system for carrying out online non-destructive measurement on refractive index of special optical fiber |
| CN104819961B (en) * | 2015-04-23 | 2019-02-22 | 上海大学 | A digital holography system for online nondestructive measurement of refractive index of special optical fibers |
| CN105092086A (en) * | 2015-09-01 | 2015-11-25 | 河南师范大学 | Dual-coupling structure-based single-mode core-dislocated fiber temperature measurement method |
| CN105571750A (en) * | 2016-03-08 | 2016-05-11 | 武汉理工大学 | Distributed pressure sensing system |
| CN111679230A (en) * | 2020-05-25 | 2020-09-18 | 汕头大学 | A Magnetic Field Sensing Device Based on Magnetic Fluid |
| CN111679230B (en) * | 2020-05-25 | 2022-12-06 | 汕头大学 | Magnetic field sensing device based on magnetic fluid |
| CN116242278A (en) * | 2023-05-11 | 2023-06-09 | 山东高速工程检测有限公司 | Orthogonal optical fiber interference fringe projector for three-dimensional measurement of asphalt pavement texture |
| CN116242278B (en) * | 2023-05-11 | 2023-07-11 | 山东高速工程检测有限公司 | Orthogonal optical fiber interference fringe projector for three-dimensional measurement of asphalt pavement texture |
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Application publication date: 20120815 |