CN205015118U - High sensitivity optic fibre microcavity baroceptor - Google Patents
High sensitivity optic fibre microcavity baroceptor Download PDFInfo
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- CN205015118U CN205015118U CN201520631705.3U CN201520631705U CN205015118U CN 205015118 U CN205015118 U CN 205015118U CN 201520631705 U CN201520631705 U CN 201520631705U CN 205015118 U CN205015118 U CN 205015118U
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- internal diameter
- capillary
- baroceptor
- microcavity
- optical fiber
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Abstract
The utility model belongs to the sensor field, concretely relates to high sensitivity optic fibre microcavity baroceptor, its characterized in that: with one section single mode fiber capillary different with two sections internal diameters butt fusion in proper order together, wherein the great capillary one end of internal diameter links to each other with single mode fiber, the other end links to each other with the less capillary of internal diameter. When using, await measuring and gaseously enter into big internal diameter capillary by little internal diameter capillary in the external world, and along with atmospheric pressure increase in the capillary, gaseous refracting index changes, result in fiber optic spectrometer in the reflection spectrum drift takes place to it measures to realize the sensing of atmospheric pressure. The utility model has the characteristics of prepare simply, with low costs, small and sensitivity is high, can be applied to in all kinds of actual engineerings.
Description
Technical field
The utility model belongs to sensor field, is specifically related to a kind of high sensitivity optical fiber microcavity baroceptor.
Background technology
In recent years, optical fiber air pressure sensor receives to be paid close attention to widely, and compared with conditional electronic baroceptor, optical fiber air pressure sensor has unique advantage: highly sensitive, lightweight, volume is little, electromagnetism interference, corrosion-resistant etc.Therefore, various structure and manufacturing technology have been applied to preparing dissimilar optical fiber air pressure sensor, as phase shift Bragg optical-fiber grating sensor, the lateral opening Photonic Crystal Fiber Sensor of twin-core, birefringence plastic optical fiber sensor etc.Fabry-Perot interferometer plays important role due to advantages such as its volume are little, sensitivity is high in air pressure sensing.Fabry-Perot interferometer baroceptor is divided into two classes: a class is sealing cavate optical fiber air pressure sensor, and another kind of is formula optical fiber air pressure sensor of beginning to speak.For sealing cavate optical fiber air pressure sensor, when ambient pressure changes, its chamber is long also can be changed thereupon.Such as, a Fabry-Perot interferometer baroceptor based on hollow-core fiber, its sensitivity is 23.4pm/MPa, and the people such as Liao optimize the manufacture craft of this baroceptor, makes its air pressure sensitivity increase 1036pm/MPa.The effective ways that effectively can improve the sensitivity of sealing cavate optical fiber air pressure sensor air pressure are a thickness for the wall reducing FP chamber, have people's profit to make the sensitivity of baroceptor reach 39.4nm/MPa and 70.5nm/MPa in this way.But this method makes the investigative range of sensor be restricted, and become very thin due to FP chamber wall, the physical strength of sensor also can be very poor.For formula optical fiber air pressure sensor of beginning to speak, its detection principle is different from sealing cavate optical fiber air pressure sensor: when make use of gas pressure change, the characteristic that refractive index changes thereupon.Therefore, compared with sealing cavate optical fiber air pressure sensor, the formula optical fiber air pressure sensor of beginning to speak has larger investigative range.Such as, desolately wait people to adopt a kind of bonding technique multiple material to be together form a kind of easy FP chamber baroceptor, but have larger thermal expansivity due to glue, therefore the Temperature cross-over sensitivity of this interferometer is higher.The people such as Coelho report the atmospheric pressure value that a kind of hybrid FP chamber baroceptor can measure oxygen and carbon dioxide simultaneously, but the superposition interference spectrum of two kinds of gases makes the demodulation of signal become very complicated.
Summary of the invention
In order to solve above-mentioned the deficiencies in the prior art, the utility model provides a kind of high sensitivity optical fiber microcavity baroceptor, the kapillary of two joint different inner diameters and single-mode fiber are welded together, there is the advantages such as preparation is simple, highly sensitive, measurement range is wide, cross sensitivity is low.
The technical scheme that the utility model adopts: a kind of high sensitivity optical fiber microcavity baroceptor, it is characterized in that: described sensor by single-mode fiber, internal diameter be the kapillary of 50um, internal diameter be 4um kapillary successively welding form, wherein 4um internal diameter capillary tube and 50um internal diameter capillary tube misplace 8um welding, and 4um internal diameter capillary tube other end end face is the inclination angle of 8 °.
Described internal diameter is the kapillary of 50um and 4um, and its external diameter is 150um.
The beneficial effects of the utility model are:
1. only general commercial optical fiber splicer need be used to be welded together by the kapillary of single-mode fiber and different inner diameters in sensor preparation process, there is the simple advantage of preparation.
2. the high sensitivity optical fiber microcavity baroceptor described in is formula optical fiber air pressure sensor of beginning to speak, and therefore has larger air pressure investigative range, and owing to growing extremely short in the chamber of the kapillary used, therefore described sensor has larger air pressure sensitivity.
3 due to the main part of sensor: the thermal expansivity of the kapillary of single-mode fiber, different inner diameters is all minimum, and therefore the Temperature cross-over sensitivity of sensor is extremely low.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and concrete mode, the utility model is described in further detail.
Fig. 1 is optical fibre sensor structure figure of the present utility model;
Fig. 2 is Fibre Optical Sensor test macro schematic diagram;
In figure: 1. Fibre Optical Sensor, 2. single-mode fiber, 3.50um internal diameter capillary tube, 4.4um internal diameter capillary tube, 5. wideband light source, 6. fiber spectrometer, 7. optical fiber circulator.
Embodiment
In Fig. 1, a kind of high sensitivity optical fiber microcavity baroceptor, it is characterized in that: described Fibre Optical Sensor 1 by single-mode fiber 2, internal diameter be the kapillary 3 of 50um, internal diameter be 4um kapillary 4 successively welding form, wherein 4um internal diameter capillary tube and 50um internal diameter capillary tube misplace 8um welding, and 4um internal diameter capillary tube other end is the inclination angle of 8 °.
As shown in Figure 2, a kind of principle of work of high sensitivity optical fiber microcavity baroceptor is: be connected with the blue connecting line of optical fiber circulator 7 through optical patchcord by Fibre Optical Sensor 1, and the redness of optical fiber circulator 7 is connected with wideband light source 5, fiber spectrometer 6 through single-mode fiber respectively with white connecting line, when carrying out air pressure sensing experiment, sensor 1 is sealed in an air chamber, because described sensor is formula optical fiber air pressure sensor of beginning to speak, the gas in air chamber enters into 50um internal diameter capillary tube 3 by 4um internal diameter capillary tube 4.When the light that wideband light source sends enters sensor, first reflection can be there is in part light at single-mode fiber 2 and the end of 50um internal diameter capillary tube 3 welding, another part light can continue to propagate and occur to reflect for the second time in 50um internal diameter capillary tube 3 and the end of 4um internal diameter capillary tube 4 welding, two bundle reflected light meet and produce interference, and its output intensity is:
phase differential
wherein n is the refractive index of gas in 50um internal diameter capillary tube 3; L is the length of 50um internal diameter capillary tube 3; λ is light wavelength in a vacuum;
for initial phase.When changing the air pressure in air chamber, along with air pressure change in kapillary, wherein the refractive index n of gas changes, and causes phase differential
change, thus interference fringe changes, and shows in fiber spectrometer the drift being spectrum crest, the sensing measurement of air pressure can be realized by the drift value measuring output center wavelength.
Claims (2)
1. a high sensitivity optical fiber microcavity baroceptor, it is characterized in that: described sensor by single-mode fiber, internal diameter be the kapillary of 50um, internal diameter be 4um kapillary successively welding form, wherein 4um internal diameter capillary tube and 50um internal diameter capillary tube misplace 8um welding, and 4um internal diameter capillary tube other end end face is the inclination angle of 8 °.
2. a kind of high sensitivity optical fiber microcavity baroceptor according to claim 1, is characterized in that: described internal diameter is the kapillary of 50um and 4um, and its external diameter is 150um.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520631705.3U CN205015118U (en) | 2015-08-17 | 2015-08-17 | High sensitivity optic fibre microcavity baroceptor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520631705.3U CN205015118U (en) | 2015-08-17 | 2015-08-17 | High sensitivity optic fibre microcavity baroceptor |
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| Publication Number | Publication Date |
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| CN205015118U true CN205015118U (en) | 2016-02-03 |
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| CN201520631705.3U Expired - Fee Related CN205015118U (en) | 2015-08-17 | 2015-08-17 | High sensitivity optic fibre microcavity baroceptor |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338348A (en) * | 2016-08-24 | 2017-01-18 | 哈尔滨工业大学（威海） | Miniature high-sensitivity optical fiber temperature sensing probe |
| CN106773014A (en) * | 2016-12-12 | 2017-05-31 | 南京大学 | A kind of compound double cavity structure for improving optical fiber hydrostatic sensor sensitivity |
| CN107121220A (en) * | 2017-05-25 | 2017-09-01 | 杭州电子科技大学 | Optics Fabry-Perot-type cavity air pressure sensing system |
| CN108731713A (en) * | 2018-05-31 | 2018-11-02 | 燕山大学 | A kind of triple clad quartz base special optical fiber micro-cavity structure sensor and preparation method |
| CN112697339A (en) * | 2020-11-26 | 2021-04-23 | 桂林电子科技大学 | High-strength high-temperature-resistant quick-response optical fiber air pressure sensing probe |
| CN113029428A (en) * | 2021-03-30 | 2021-06-25 | 武汉理工大学 | FP (Fabry-Perot) air pressure sensor based on gas-sensitive film in optical fiber and preparation method thereof |
-
2015
- 2015-08-17 CN CN201520631705.3U patent/CN205015118U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106338348A (en) * | 2016-08-24 | 2017-01-18 | 哈尔滨工业大学（威海） | Miniature high-sensitivity optical fiber temperature sensing probe |
| CN106773014A (en) * | 2016-12-12 | 2017-05-31 | 南京大学 | A kind of compound double cavity structure for improving optical fiber hydrostatic sensor sensitivity |
| CN107121220A (en) * | 2017-05-25 | 2017-09-01 | 杭州电子科技大学 | Optics Fabry-Perot-type cavity air pressure sensing system |
| CN108731713A (en) * | 2018-05-31 | 2018-11-02 | 燕山大学 | A kind of triple clad quartz base special optical fiber micro-cavity structure sensor and preparation method |
| CN108731713B (en) * | 2018-05-31 | 2020-09-25 | 燕山大学 | Three-clad quartz-based special optical fiber micro-cavity structure sensor and preparation method thereof |
| CN112697339A (en) * | 2020-11-26 | 2021-04-23 | 桂林电子科技大学 | High-strength high-temperature-resistant quick-response optical fiber air pressure sensing probe |
| CN113029428A (en) * | 2021-03-30 | 2021-06-25 | 武汉理工大学 | FP (Fabry-Perot) air pressure sensor based on gas-sensitive film in optical fiber and preparation method thereof |
| CN113029428B (en) * | 2021-03-30 | 2022-07-08 | 武汉理工大学 | FP (Fabry-Perot) air pressure sensor based on gas-sensitive film in optical fiber and preparation method thereof |
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Legal Events
| Date | Code | Title | Description |
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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: 20160203 Termination date: 20160817 |
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| CF01 | Termination of patent right due to non-payment of annual fee |