CN204043619U - Based on the micro-displacement sensor of optical fiber - Google Patents
Based on the micro-displacement sensor of optical fiber Download PDFInfo
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- CN204043619U CN204043619U CN201420531821.3U CN201420531821U CN204043619U CN 204043619 U CN204043619 U CN 204043619U CN 201420531821 U CN201420531821 U CN 201420531821U CN 204043619 U CN204043619 U CN 204043619U
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- optical fiber
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Abstract
The utility model belongs to displacement transducer technology field, particularly a kind of micro-displacement sensor based on optical fiber.This displacement transducer comprises wideband light source, coupling mechanism and spectrometer; First port of described coupling mechanism and wideband light source pass through Fiber connection, second port of coupling mechanism and spectrometer pass through Fiber connection, 3rd port of coupling mechanism is connected a measuring optical fiber respectively with the 4th port, the free end of two measuring optical fiber has one section of parallel or conllinear, the vertical misalignment amount of the free end of two measuring optical fiber is G, and transversal displacement is S; Wherein, G is the diameter that 0 ~ 1mm, S are not more than measuring optical fiber.Utilize the distance of the end face of two measuring optical fiber to change and test displacement sensing, stability is high, and its susceptibility is far longer than existing Fibre Optical Sensor, and susceptibility increases along with the reduction in two optical fiber gaps, can realize the displacement measurement of ultra high sensitivity.In addition, do not need the polarization maintaining optical fibre of high birefringence in this sensor, cost of manufacture also reduces greatly.
Description
Technical field
The utility model belongs to displacement transducer technology field, and particularly a kind of micro-displacement sensor based on optical fiber, is applicable to industrial processes, automation control area.
Background technology
The advantage of Fibre Optical Sensor is electromagnetism interference, simple and compact for structure, experiment measuring.Practical optical fibre displacement sensor mainly comprises two large classes: intensity sensor and wavelength sensor.Intensity sensor is the displacement transducer occurred the earliest, and has been used as commercial decades, and this has benefited from its extremely simple structure and higher practicality.Its basic functional principle affects by different shift values the luminous power received by sensor, and different displacements corresponds to different optical power values, reaches the object of sensing with this.Most intensity sensor only has one to export and an output, requires higher to the power stability of light source, in order to solve this defect, adopts the structure of two output optical fibres can avoid the impact of power swing on measuring accuracy of light source.Be no matter the displacement intensity sensor of which kind of structure above, their sensing accuracy is all relatively low, and along with the development of technology, wavelength sensor has had very huge progress on sensitivity of measurement.Topmost a kind of wavelength sensor is based on interferometer principle, and this sensor is not only immune to the power swing of light source, and also very high at susceptibility.
Interferometer structure generally includes Mach Zehnder interferometry, Sagnac interferometer, Michelson interferometer, FP chamber interferometer, multi-mode interferometer etc.Mach-Zehnder interferometers is that output light is divided into two-way, transmits in different paths, and this makes it poor in the stability of temperature and vibration; The beam splitting of light and conjunction too, are just restrainted to have come by a structure, can not be avoided the impact of external interference equally by Michelson interferometer.FP chamber is usually shorter, better to the stability of temperature and vibration, but the susceptibility of displacement is not high.The two-beam of Sagnac interferometer transmits in same optical fiber, the impact of external interference reduces greatly, therefore, it can be used to do stable displacement sensing, but the sensor reported is not high on displacement susceptibility, and all need the optical fiber of high birefringence as Polarization Control device in fiber optic loop, this makes its cost of manufacture also higher.
Therefore, current optical fibre displacement sensor institute problems faced is: poor stability, susceptibility are low and cost is high.
Summary of the invention
The utility model, for the shortcoming of existing optical fibre displacement sensor, provides a kind of micro-displacement sensor based on optical fiber.
The technical solution adopted in the utility model is:
This displacement transducer comprises wideband light source, coupling mechanism and spectrometer; First port of described coupling mechanism and wideband light source pass through Fiber connection, second port of coupling mechanism and spectrometer pass through Fiber connection, 3rd port of coupling mechanism is connected a measuring optical fiber respectively with the 4th port, the free end of two measuring optical fiber has one section of parallel or conllinear, the vertical misalignment amount of the free end of two measuring optical fiber is G, and transversal displacement is S;
Wherein, G is the diameter that 0 ~ 1mm, S are not more than measuring optical fiber.
The beneficial effects of the utility model are:
Utilize the distance of the end face of two measuring optical fiber to change and test displacement sensing, stability is high, the susceptibility of its displacement sensing is far longer than existing Fibre Optical Sensor, and susceptibility increases along with the reduction in two optical fiber gaps, can realize the displacement measurement of ultra high sensitivity.In addition, the measure portion of this sensor forms Sagnac ring structure, but does not need the polarization maintaining optical fibre of high birefringence, and cost of manufacture also reduces greatly.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the relative position relation figure of two measuring optical fiber.
Number in the figure:
1-wideband light source; 2-coupling mechanism; 21-first port; 22-second port; 23-the 3rd port; 24-the 4th port; 3-spectrometer.
Embodiment
The utility model provides a kind of micro-displacement sensor based on optical fiber, is described further the utility model below in conjunction with the drawings and specific embodiments.
The structure of this displacement transducer as shown in Figure 1, comprises wideband light source 1, coupling mechanism 2 and spectrometer 3.
First port 21 of coupling mechanism 2 passes through Fiber connection with wideband light source 1, second port 22 of coupling mechanism 2 passes through Fiber connection with spectrometer 3,3rd port 23 of coupling mechanism 2 is connected a measuring optical fiber respectively with the 4th port 24, the free end of two measuring optical fiber has one section of parallel or conllinear, the vertical misalignment amount of the free end of two measuring optical fiber is G, transversal displacement is S, as shown in Figure 2; Wherein, G is the diameter that 0 ~ 1mm, S are not more than measuring optical fiber.
Use this displacement transducer can measure small length travel and transversal displacement, its method is respectively:
The free end of two measuring optical fiber is separately fixed at one may occur on the device of relative displacement.If two measuring optical fiber end cross section complete matchings, the output display of spectrometer 3 will not have interference and occur, therefore, transversal displacement S be set to a fixed value of the diameter being not more than measuring optical fiber and remain unchanged, the change of the vertical misalignment amount G on measuring optical fiber axis direction can make the Free Spectral Range of spectrometer 3 change, and measures small length travel with this.Vertical misalignment amount G be set to a fixed value between 0 ~ 1mm and remain unchanged, the change of measuring optical fiber transversal displacement S transversely can make the transmission spectrum wavelength of spectrometer 3 drift about, and measures small transversal displacement with this.
Claims (1)
1., based on the micro-displacement sensor of optical fiber, comprise wideband light source (1), coupling mechanism (2) and spectrometer (3), it is characterized in that:
First port (21) and the wideband light source (1) of described coupling mechanism (2) pass through Fiber connection, second port (22) and the spectrometer (3) of coupling mechanism (2) pass through Fiber connection, 3rd port (23) of coupling mechanism (2) is connected a measuring optical fiber respectively with the 4th port (24), the free end of two measuring optical fiber has one section of parallel or conllinear, the vertical misalignment amount of the free end of two measuring optical fiber is G, and transversal displacement is S;
Wherein, G is the diameter that 0 ~ 1mm, S are not more than measuring optical fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420531821.3U CN204043619U (en) | 2014-09-16 | 2014-09-16 | Based on the micro-displacement sensor of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420531821.3U CN204043619U (en) | 2014-09-16 | 2014-09-16 | Based on the micro-displacement sensor of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204043619U true CN204043619U (en) | 2014-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201420531821.3U Expired - Fee Related CN204043619U (en) | 2014-09-16 | 2014-09-16 | Based on the micro-displacement sensor of optical fiber |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333823A (en) * | 2015-10-22 | 2016-02-17 | 南方科技大学 | Optical fiber displacement sensor |
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2014
- 2014-09-16 CN CN201420531821.3U patent/CN204043619U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105333823A (en) * | 2015-10-22 | 2016-02-17 | 南方科技大学 | Optical fiber displacement sensor |
| CN105333823B (en) * | 2015-10-22 | 2018-02-16 | 南方科技大学 | Optical fibre displacement sensor |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20141224 Termination date: 20160916 |
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| CF01 | Termination of patent right due to non-payment of annual fee |