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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Abstract
The invention relates to an interference type refractive index sensor based on a polarization maintaining optical fiber. The interference type refractive index sensor is characterized by comprising a broadband light source (1), an array polarizer (2), a polarization adjuster (3), a polarization maintaining optical fiber (4), a spectrum analyzer (5), a connecting optical fiber (6), an incident optical fiber (7) and an emergent optical fiber (8), wherein the broadband light source (1) and the array polarizer (2) are connected through the connecting optical fiber (6), the array polarizer (2) and the polarization maintaining optical fiber (4) are respectively connected with the polarization adjuster (3) through the connecting optical fiber (6) and the incident optical fiber (7), the center of a fiber core of the incident optical fiber (7) is aligned and connected with the center of the fiber core of the polarization maintaining optical fiber (4), the polarization maintaining optical fiber (4) is further connected with the spectrum analyzer (5) through the emergent optical fiber (8), and the center of the fiber core of the polarization maintaining optical fiber (4) and the center of the fiber core of the emergent optical fiber (8) are connected in a misaligned manner; and the polarization maintaining optical fiber (4) is taken as a sensing probe for measuring the refractive index. The device has the advantages of high sensitivity in measurement of the refractive index, simple structure and great application prospects, and can be applied to various actual projects.
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)
1. the 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 the center of polarization maintaining optical fibre (4) 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.
2. a kind of interfere type index sensor according to claim 1 based on polarization maintaining optical fibre; It is characterized in that: connecting optical fiber, incident optical and outgoing optical fiber can be general single-mode fiber; The single-mode fiber core diameter is 9～15 microns, and cladding diameter is 100～150 microns.
3. a kind of interfere type index sensor based on polarization maintaining optical fibre according to claim 1 is characterized in that: polarization maintaining optical fibre (4) core diameter is 5～8 microns, and cladding diameter is 50～100 microns, and birefraction is 2.4 * 10
-4, the length range of polarization maintaining optical fibre (4) is 1～2cm.
4. a kind of interfere type index sensor based on polarization maintaining optical fibre according to claim 1 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.
5. a kind of interfere type index sensor according to claim 1 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.
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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 | 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 |
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| 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 kind of digital hologram system of online nondestructive measurement special optical fiber refractive index |
| 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 | 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 |