CN203929062U - A kind of optical fiber inclinometer - Google Patents
A kind of optical fiber inclinometer Download PDFInfo
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- CN203929062U CN203929062U CN201420355831.6U CN201420355831U CN203929062U CN 203929062 U CN203929062 U CN 203929062U CN 201420355831 U CN201420355831 U CN 201420355831U CN 203929062 U CN203929062 U CN 203929062U
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- mode fiber
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- optical fiber
- polarization maintaining
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Abstract
The utility model discloses a kind of optical fiber inclinometer, comprise wideband light source, the first single-mode fiber, polarization maintaining optical fibre, the second single-mode fiber and spectrometer, the output terminal of wideband light source is connected with the left end of the first single-mode fiber, the right-hand member of the first single-mode fiber draws wimble structure to be connected with the left end of polarization maintaining optical fibre by optical fiber, the right-hand member of polarization maintaining optical fibre is connected by peanut shaped structure with the left end of the second single-mode fiber, and the right-hand member of the second single-mode fiber is connected with spectrometer.In the time that optical fiber inclination angle changes, cause transmitted spectrum to move, this device is measured inclination angle size by the drift value of peak wavelength in monitoring transmitted spectrum.This inclinometer has compact conformation, makes simply the advantages such as sensitivity height.
Description
Technical field
The utility model relates to a kind of inclinometer, relates in particular to a kind of optical fiber inclinometer.
Background technology
Optical fiber obliquity sensor is widely used at monitoring structural health conditions, the measurement of angle under particular surroundings, the fields such as soil property measurement.Inclinometer is being brought into play huge effect in earth's surface and the monitoring of side slope inclination angle, when earth's surface and side slope generation inclination angle, will cause the generation of disaster, can play the effect of early warning.In physical construction health monitoring, inclinometer also has vital role.Because in Large Scale Mechanical Structure, machine equipment makes part that inclination angle occur, and causes mechanical fault, the health condition that inclinometer can monitoring instrument.At present, the inclinometer of contrast and other principle, optical fiber inclinometer has closed light path, can be applicable to the particular surroundingss such as strong-electromagnetic field, precision advantages of higher.
Along with the development of optical fiber sensing technology, there are many methods to be used for making optical fiber inclinometer, for example utilize the inclinometer of fiber grating and cantilever beam structure; Utilize long-period fiber grating device to inclinator, inclination angle is converted into strain and measures; Utilizing at optical fiber draws cone place to carve phase-shifted fiber grating; But these sensors have corresponding shortcoming.Fiber grating, the inclinometer that long period fiber grating and other structures combine, its principle is all the measurement that the measurement at inclination angle is converted to strain, its sensitivity is low, and will combine with the structure such as semi-girder, complex structure, volume is large.Draw on cone and inscribe phase-shifted fiber grating at optical fiber, the making complexity of its sensor, cost of manufacture is high.Therefore a little sensors are restricted in practice.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the object of the present invention is to provide a kind of optical fiber inclinometer, this optical fiber inclinometer has compact conformation, makes simply the advantages such as sensitivity height.
In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of optical fiber inclinometer, comprise wideband light source, the first single-mode fiber, polarization maintaining optical fibre, the second single-mode fiber and spectrometer, the output terminal of wideband light source is connected with the left end of the first single-mode fiber, the right-hand member of the first single-mode fiber is connected with the left end of polarization maintaining optical fibre, the right-hand member of polarization maintaining optical fibre is connected with the left end of the second single-mode fiber, and the right-hand member of the second single-mode fiber is connected with spectrometer; It is characterized in that, the described right-hand member of the first single-mode fiber and the left end of polarization maintaining optical fibre are that optical fiber draws wimble structure, and the left end of the right-hand member of described polarization maintaining optical fibre and the second single-mode fiber is peanut shaped structure.
Described polarization maintaining optical fibre length is 20-40mm.
Described optical fiber draws wimble structure, and diameter is 30-60 μ m, and length is 1-2mm.
Described peanut shaped structure, diameter is 200-300 μ m, length is 400-600 μ m.
Described wideband light source wavelength coverage is 1500-1600nm.
Described spectrometer detects the transmitted spectrum of output, and its resolution is 10-20pm.
The beneficial effect that the present invention has is:
1. utilize optical fiber to draw the pliability of wimble structure directly to measure inclination angle, can realize the high-acruracy survey to inclination angle;
2. utilize optical fiber to draw cone and peanut shaped structure, easily manufactured, compact conformation, with low cost;
3. adopt spectrometer detection peak wavelength to move, make measuring method simple and convenient, improve the practicality of sensor.
Brief description of the drawings
Below in conjunction with accompanying drawing and embodiment thereof, the invention will be further described.
Fig. 1 is experimental provision figure of the present invention;
Fig. 2 is the result figure that utilizes the present invention to measure.
In figure, 1 is wideband light source; 2 is the first single-mode fiber; 3 draw wimble structure for optical fiber; 4 is polarization maintaining optical fibre; 5 is peanut shaped structure; 6 is the second single-mode fiber; 7 is spectrometer.
Specific implementation method
In Fig. 1, a kind of optical fiber inclinometer, comprises that wideband light source 1, the first single-mode fiber 2, optical fiber draw wimble structure 3, polarization maintaining optical fibre 4, peanut shaped structure 5, the second single-mode fiber 6 and spectrometer 7.The output terminal of wideband light source 1 is connected with the left end of the first single-mode fiber 2, the right-hand member of the first single-mode fiber 2 draws wimble structure to be connected with the left end of polarization maintaining optical fibre 4 by optical fiber, the right-hand member of polarization maintaining optical fibre 4 is connected by peanut shaped structure 5 with the left end of the second single-mode fiber 6, and the right-hand member of the second single-mode fiber 6 is connected with spectrometer 7.
Its working method is: the broadband light that wideband light source 1 sends is inputted the form with basic mode in the first single-mode fiber 2 and propagated, and most luminous energies are strapped in fibre core.Light wave is transferred to optical fiber through the first single-mode fiber 2 and draws wimble structure 3, because optical fiber draws wimble structure, mode field diameter is not mated, and a part of light injects the covering of polarization maintaining optical fibre 4, thereby excites high-order cladding mode to transmit in covering; Another part optically-coupled enters the fibre core of polarization maintaining optical fibre 4, propagates in fibre core with the form of basic mode.Two parts light transmits through middle polarization maintaining optical fibre 4, is again coupled and produces interference in peanut shaped structure 5, and interference light, through the second single-mode fiber 6 input spectrum instrument 7, demonstrates the interference pattern of transmitted spectrum.In the time that optical fiber inclination angle changes, the phase differential that produces two parts light of interfering changes, and causes transmitted spectrum to move, and this device is measured inclination angle size by the drift value of peak wavelength in monitoring transmitted spectrum just.
Fig. 2 is the result figure that utilizes the present invention to measure.When inclination angle that optical fiber draws wimble structure is increased to 6.7 ° from 0 °, the crest of interference spectrum has moved 19.8nm, and sensitivity coefficient is 2.9nm/ degree, and corresponding angular resolution is 6.9 × 10
-3degree.
Claims (3)
1. an optical fiber inclinometer, comprise wideband light source, the first single-mode fiber, polarization maintaining optical fibre, the second single-mode fiber and spectrometer, the output terminal of wideband light source is connected with the left end of the first single-mode fiber, the right-hand member of the first single-mode fiber is connected with the left end of polarization maintaining optical fibre, the right-hand member of polarization maintaining optical fibre is connected with the left end of the second single-mode fiber, and the right-hand member of the second single-mode fiber is connected with spectrometer; It is characterized in that, the described right-hand member of the first single-mode fiber and the left end of polarization maintaining optical fibre are that optical fiber draws wimble structure, and the left end of the right-hand member of described polarization maintaining optical fibre and the second single-mode fiber is peanut shaped structure.
2. a kind of optical fiber inclinometer according to claim 1, is characterized in that, described optical fiber draws wimble structure, and diameter is 30-60 μ m, and length is 1-2mm.
3. a kind of optical fiber inclinometer according to claim 1, is characterized in that, described peanut shaped structure, and diameter is 200-300 μ m, length is 400-600 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420355831.6U CN203929062U (en) | 2014-06-24 | 2014-06-24 | A kind of optical fiber inclinometer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420355831.6U CN203929062U (en) | 2014-06-24 | 2014-06-24 | A kind of optical fiber inclinometer |
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| Publication Number | Publication Date |
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| CN203929062U true CN203929062U (en) | 2014-11-05 |
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| CN201420355831.6U Expired - Fee Related CN203929062U (en) | 2014-06-24 | 2014-06-24 | A kind of optical fiber inclinometer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014411A (en) * | 2017-04-05 | 2017-08-04 | 浙江大学 | A kind of flexible micro-nano fiber angle sensor chip and sensor and preparation method |
| CN107121083A (en) * | 2017-06-23 | 2017-09-01 | 燕山大学 | A kind of asymmetric thick wimble structure less fundamental mode optical fibre strain transducer |
-
2014
- 2014-06-24 CN CN201420355831.6U patent/CN203929062U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107014411A (en) * | 2017-04-05 | 2017-08-04 | 浙江大学 | A kind of flexible micro-nano fiber angle sensor chip and sensor and preparation method |
| CN107121083A (en) * | 2017-06-23 | 2017-09-01 | 燕山大学 | A kind of asymmetric thick wimble structure less fundamental mode optical fibre strain transducer |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20141105 Termination date: 20150624 |
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| EXPY | Termination of patent right or utility model |