CN206683813U - Michelson optical fiber air pressure sensor based on thin-core fibers - Google Patents
Michelson optical fiber air pressure sensor based on thin-core fibers Download PDFInfo
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- CN206683813U CN206683813U CN201720266629.XU CN201720266629U CN206683813U CN 206683813 U CN206683813 U CN 206683813U CN 201720266629 U CN201720266629 U CN 201720266629U CN 206683813 U CN206683813 U CN 206683813U
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Abstract
The utility model discloses the Michelson optical fiber air pressure sensor based on thin-core fibers.The sensor includes single-mode fiber and thin-core fibers, it is characterised in that：Described fibre optical sensor is to form single-mode fiber and thin-core fibers dislocation welding, there is an aperture on thin-core fibers fibre core.Single-mode fiber and thin-core fibers dislocation welding, when light beam through single-mode fiber by when, a part of optical coupling enters thin-core fibers fibre core, and another part then enters thin-core fibers covering and propagated.Because the light path of two parts light experience is different, and then cause the difference of phase.It can occur to reflect backtracking when this two parts beam propagation is to the contact face of thin-core fibers and air, so as to form a Michelson's interferometer.When the change of ambient pressure can cause the change of refractive index in aperture, cause change in optical path length, and then cause the change of phase, Pressure monitoring can be then realized by monitoring Michelson interference spectrum.
Description
Technical field
The utility model belongs to sensor field, and in particular to the Michelson optical fiber air pressure sensing based on thin-core fibers
Device.
Background technology
Fibre optical sensor is obtained in the field such as biomedical, auto manufacturing and environmental monitoring due to its unique advantage
Universal application, since the nineties in last century, the application of fibre optical sensor has spread over each neck of national economy
Domain, especially it is with a wide range of applications in security protection, building monitoring and energy neighborhood.
Optical fiber air pressure sensor is even more because it has good multiplexing ability, small volume, electromagnetism interference and is easy to
The advantages that signal detection and the extensive concern for receiving people.The optical fiber air pressure sensor of various structures has been reported, such as base
In π phase offset bragg gratings baroceptor, the lateral opening double-core photonic crystal fiber baroceptor of side-hole fiber
With birefringence plastic optical fiber baroceptor.In recent years, optical fiber air pressure sensor receives extensive research, such as in fiber end face
The baroceptor and bragg fiber of the upper baroceptor for plating sensitive membrane structure, single and double-core photonic crystal fiber structure
Baroceptor of optical grating construction etc..The air pressure sensitivity of FP chamber baroceptors based on membrane structure is to change when institute by air pressure
What the caused long knots modification of FP chambers chamber determined, and the long knots modification of chamber is related to the thickness of used film, when the thickness of the film used
When degree scope reaches 100-1000nm, you can obtain high air pressure sensitivity.But based on the baroceptor of membrane structure due to
The shortcomings of film cracky and complex operation and cause its use to be greatly limited.Although use single or twin-core structure
Photonic crystal fiber can obtain firm optical fiber air pressure sensor, but its air pressure sensitivity, which depends on air pressure, to be changed and is drawn
The change of the earth silicon material refractive index risen, therefore its air pressure sensitivity is very low, typically smaller than 33pm/MPa.
The content of the invention
In order to solve above-mentioned the deficiencies in the prior art, the utility model discloses the Michelson optical fiber based on thin-core fibers
Baroceptor.The sensor has the advantages that preparation is simple, cost is low, firm.
Technical scheme is used by the utility model：Michelson optical fiber air pressure sensor based on thin-core fibers, should
Sensor includes single-mode fiber and thin-core fibers, it is characterised in that：Described fibre optical sensor is by single-mode fiber and thin core light
Fine dislocation welding forms, and has an aperture on thin-core fibers fibre core.Further, described single-mode fiber is communication single-mode optics
Fibre, its cladding diameter are 125 microns；Described thin-core fibers core diameter is 3-8 microns, and external diameter is 120-130 microns, and it is grown
Spend for 1-5 millimeters；A diameter of 5-50 microns of described aperture.
The beneficial effects of the utility model are：
1. sensor integral material is optical fiber, and only need to use femto-second laser and general commercial optical fiber welding in preparation process
Pick, have and prepare the advantages of simple.
2. sensor is formula baroceptor of beginning to speak, when air pressure changes, the gas refracting index in air inlet chamber can be sent out
It is raw to change, its sensitive baroceptor far above the closed lumen type of in general.
3. prepare, due to be micro Process processing, in the air chamber that core segment focuses on out compared with whole optical fiber size
It is smaller, therefore the general fibre optical sensor of the sensor ratio is firm.
Brief description of the drawings
Below in conjunction with the accompanying drawings and concrete mode the utility model is described in further detail.
Fig. 1 is fibre optic interferometer structure chart of the present utility model；
In figure：1. single-mode fiber, 2. thin-core fibers, 3. apertures
Embodiment
Such as Fig. 1, the step of preparing sensor, is：The first step, by single-mode fiber and thin-core fibers dislocation welding；Second step,
The end face that thin-core fibers expose is cut flat with；3rd step, an aperture is opened on thin-core fibers side using femto-second laser.It is special
Sign is：All single-mode fiber cladding diameters utilized are 125 microns；Described thin-core fibers core diameter is 3-8 microns,
External diameter is 120-130 microns, and its length is 1-5 millimeters；A diameter of 5-50 microns of described aperture.
Concrete operating principle of the present utility model is：Single-mode fiber and thin-core fibers dislocation welding, when light beam is through single-mode optics
It is fine by when, a part of optical coupling enters thin-core fibers fibre core, and another part then enters covering and propagated.Due to two parts light experience
Light path is different, and then causes the difference of phase.The meeting when this two parts beam propagation is to the contact face of thin-core fibers and air
Backtracking is reflected in generation, so as to form a Michelson's interferometer.Reflected when the change of ambient pressure can cause in aperture
The change of rate, cause change in optical path length, and then cause the change of phase, air pressure can be then realized by monitoring Michelson interference spectrum
Monitoring.
Claims (4)
1. the Michelson optical fiber air pressure sensor based on thin-core fibers, including single-mode fiber (1), thin-core fibers (2) and aperture
(3), it is characterised in that：Described fibre optical sensor is that single-mode fiber (1) and thin-core fibers (2) dislocation welding form, thin core light
There is an aperture (3) on fine (2) fibre core.
2. the Michelson optical fiber air pressure sensor according to claim 1 based on thin-core fibers, it is characterised in that：It is described
Single-mode fiber be communication single-mode fiber, its cladding diameter is 125 microns.
3. the Michelson optical fiber air pressure sensor according to claim 1 based on thin-core fibers, it is characterised in that：It is described
Thin-core fibers (2) length be 1-5 millimeters, core diameter is 3-8 microns, and external diameter is 120-130 microns.
4. the Michelson optical fiber air pressure sensor according to claim 1 based on thin-core fibers, it is characterised in that：It is described
Aperture (3) a diameter of 5-50 microns, its position is on thin-core fibers fibre core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720266629.XU CN206683813U (en) | 2017-03-16 | 2017-03-16 | Michelson optical fiber air pressure sensor based on thin-core fibers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720266629.XU CN206683813U (en) | 2017-03-16 | 2017-03-16 | Michelson optical fiber air pressure sensor based on thin-core fibers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206683813U true CN206683813U (en) | 2017-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720266629.XU Expired - Fee Related CN206683813U (en) | 2017-03-16 | 2017-03-16 | Michelson optical fiber air pressure sensor based on thin-core fibers |
Country Status (1)
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| CN (1) | CN206683813U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924082A (en) * | 2021-01-25 | 2021-06-08 | 广东海洋大学 | High-sensitivity air pressure sensor based on suspension core optical fiber and side hole optical fiber |
| CN113776723A (en) * | 2021-09-30 | 2021-12-10 | 云南师范大学 | Optical fiber air pressure detector based on optical coupling change |
-
2017
- 2017-03-16 CN CN201720266629.XU patent/CN206683813U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112924082A (en) * | 2021-01-25 | 2021-06-08 | 广东海洋大学 | High-sensitivity air pressure sensor based on suspension core optical fiber and side hole optical fiber |
| CN112924082B (en) * | 2021-01-25 | 2021-09-28 | 广东海洋大学 | High-sensitivity air pressure sensor based on suspension core optical fiber and side hole optical fiber |
| CN113776723A (en) * | 2021-09-30 | 2021-12-10 | 云南师范大学 | Optical fiber air pressure detector based on optical coupling change |
| CN113776723B (en) * | 2021-09-30 | 2023-09-19 | 云南师范大学 | Optical fiber air pressure detector based on optical coupling change |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171128 Termination date: 20190316 |
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| CF01 | Termination of patent right due to non-payment of annual fee |