CN109186849A - Controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect - Google Patents
Controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect Download PDFInfo
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- CN109186849A CN109186849A CN201810971799.7A CN201810971799A CN109186849A CN 109186849 A CN109186849 A CN 109186849A CN 201810971799 A CN201810971799 A CN 201810971799A CN 109186849 A CN109186849 A CN 109186849A
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- perot
- incident optical
- fiber optica
- based fiber
- mirror based
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L11/00—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00
- G01L11/02—Measuring steady or quasi-steady pressure of a fluid or a fluent solid material by means not provided for in group G01L7/00 or G01L9/00 by optical means
Abstract
The invention discloses a kind of controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect, including glass capillary, incident optical and mirror based fiber optica, incident optical and mirror based fiber optica are successively spaced apart in glass capillary, the side wall of glass capillary is equipped with opening, and incident optical and mirror based fiber optica are distributed in the two sides of opening.A variety of different transducer sensitivity amplification coefficients are provided, suitable for the measurement of different pressures, expand sensor uses range.
Description
Technical field
The present invention relates to fiber optic sensor technology fields, and in particular to a kind of controllable sensitivity optical fiber based on cursor effect
Fabry-Perot baroceptor.
Background technique
Air pressure is industrial processes, the Important Parameters inside pipeline, in the test such as environmental monitoring, currently used technology
Mainly MEMS technology, but since fibre optical sensor has a small in size, light-weight, electromagnetism interference, measurement accuracy it is high and
The advantages that being easy to implement distributed sensor, therefore fiber optic sensor technology is applied to barometric surveying as a research side
To.Wherein diaphragm type baroceptor is a Main way of people's research, and wherein the selection of diaphragm material has quartz respectively
(Liu S,Wang Y,Liao C,et al.Nano silica diaphragm in-fiber cavity for gas
Pressure measurement. [J] .Scientific Reports, 2017,7 (1)), graphene (Ma J, Jin W, Ho
H L,et al.High-sensitivity fiber-tip pressure sensor with graphene diaphragm
[J].Optics Letters,2012,37(13):2493-2495.)、PVC(Zhang Z,Liao C,Tang J,et
al.High-Sensitivity Gas-Pressure Sensor Based on Fiber-Tip PVC Diaphragm
Fabry–Pérot Interferometer[J].Journal of Lightwave Technology,2017,35(18):
4067-4071.), silver-plated (Xu F, Ren D, Shi X, et al.High-sensitivity Fabry-Perot
interferometric pressure sensor based on a nanothick silver diaphragm[J]
.Optics Letters, 2012,37 (2): 133-5.) etc., but these technology manufacturing processes are comparatively laborious, technique requirement
High and poor controllability.Another research direction is namely based on formula baroceptor of beginning to speak (Ran Z, Liu S, Liu Q, et
al.Novel High-Temperature Fiber-Optic Pressure Sensor Based on Etched PCF F-P
Interferometer Micromachined by a 157-nm Laser[J].IEEE Sensors Journal,2015,
15 (7): 3955-3958.), the variation of the intracavitary gas refracting index of Fabry-Perot is led to using air pressure change, to make to sense
The wavelength of device changes.But this simple formula baroceptor sensitivity of beginning to speak is lower, is difficult to less than 0.1MPa's
Air pressure measures, and the scope of application greatly reduces.
Summary of the invention
The technical problem to be solved by the present invention is in view of the foregoing defects the prior art has, provide a kind of based on trip
The controllable sensitivity optical fibre Fabry-perot baroceptor for marking effect provides a variety of different transducer sensitivity amplification systems
Number, suitable for the measurement of different pressures, expand sensor uses range.
Used technical solution is the present invention to solve above-mentioned technical problem:
A kind of controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect, including glass capillary,
Incident optical and mirror based fiber optica, incident optical and mirror based fiber optica are successively spaced apart in glass capillary, glass capillary
Side wall is equipped with opening, and incident optical and mirror based fiber optica are distributed in the two sides of opening.
According to above-mentioned technical proposal, incident optical and mirror based fiber optica are individually fixed in the both ends of glass capillary.
According to above-mentioned technical proposal, the outer end face of mirror based fiber optica is connected with hollow optic fibre, and one end of hollow optic fibre is sheathed on
In glass capillary, hollow optic fibre and glass capillary welding, mirror based fiber optica are fixed in glass capillary by hollow optic fibre.
According to above-mentioned technical proposal, incident optical and glass capillary welding, mirror based fiber optica and hollow optic fibre welding.
According to above-mentioned technical proposal, the both ends of mirror based fiber optica are sheathed in glass capillary.
According to above-mentioned technical proposal, the both ends of the surface of mirror based fiber optica and the inner face of incident optical are smooth.
According to above-mentioned technical proposal, before incident optical is fixed, by mobile incident optical, to change incident optical and anti-
The distance for penetrating fiber end face makes it generate cursor effect, and incident optical is adjusted to after designated position, incident optical is fused to
In glass capillary.
According to above-mentioned technical proposal, the controllable sensitivity optical fibre Fabry-perot air pressure transmission based on cursor effect
The sensitivity amplification factor of sensor are as follows:
In formula (1), FSR1It is the Free Spectral Range that two end faces of mirror based fiber optica are formed, FSR2For incident optical end face
The Free Spectral Range formed with mirror based fiber optica at a distance of nearest end face.
According to above-mentioned technical proposal, the controllable sensitivity optical fibre Fabry-perot air pressure transmission based on cursor effect
The sensitivity amplification factor of sensor are as follows:
In formula (2), n1For the effective refractive index of mirror based fiber optica, L1 is the length of mirror based fiber optica, n2For incident optical and instead
Effective refractive index of the optical fiber between nearest end face is penetrated, L2 is incident optical and mirror based fiber optica between nearest end face
Distance.
The invention has the following advantages:
The present invention is successively spaced apart by incident optical and mirror based fiber optica in glass capillary, in conjunction with glass capillary
On opening form the baroceptor begun to speak, the inner face of incident optical and two end faces of mirror based fiber optica constitute three reflections
End face.Mobile incident optical is adjusted to the distance of mirror based fiber optica end face by mobile incident optical, is formed cursor effect, is adjusted and pass
The amplification coefficient of sensor sensitivity provides a variety of different transducer sensitivity amplification coefficients, suitable for the measurement of different pressures,
Expand sensor uses range.
Detailed description of the invention
Fig. 1 is the controllable sensitivity optical fibre Fabry-perot baroceptor in the embodiment of the present invention based on cursor effect
Structural schematic diagram；
Fig. 2 be medium sensitivity amplification factor of the embodiment of the present invention be 15 when the controllable sensitivity Fiber Optic Sensor based on cursor effect
The interference light spectrogram of Fabry-Perot-type baroceptor；
Fig. 3 be medium sensitivity amplification factor of the embodiment of the present invention be 20 when the controllable sensitivity Fiber Optic Sensor based on cursor effect
The interference light spectrogram of Fabry-Perot-type baroceptor；
Fig. 4 be medium sensitivity amplification factor of the embodiment of the present invention be 27 when the controllable sensitivity Fiber Optic Sensor based on cursor effect
The interference light spectrogram of Fabry-Perot-type baroceptor；
Fig. 5 be medium sensitivity amplification factor of the embodiment of the present invention be 33 when the controllable sensitivity Fiber Optic Sensor based on cursor effect
The interference light spectrogram of Fabry-Perot-type baroceptor；
Controllable sensitivity Fiber Optic Sensor when Fig. 6 is different sensitivity amplification factor in the embodiment of the present invention based on cursor effect
The wave length shift figure of Fabry-Perot-type baroceptor；
In figure, 1- glass capillary, 2- opening, 3- incident optical, 4- mirror based fiber optica, 5- hollow optic fibre.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and examples.
The controllable sensitivity light based on cursor effect shown in referring to Fig.1~Fig. 6, in one embodiment provided by the invention
Fiber fabry-perot baroceptor, including glass capillary 1, incident optical 3 and mirror based fiber optica 4, incident optical 3 and reflection
Optical fiber 4 is successively spaced apart in glass capillary 1, and the side wall of glass capillary 1 is equipped with opening 2, incident optical 3 and reflection
Optical fiber 4 is distributed in the two sides of opening 2.
Further, incident optical 3 and mirror based fiber optica 4 are individually fixed in the both ends of glass capillary 1.
Further, the outer end face of mirror based fiber optica 4 is connected with hollow optic fibre 5, and one end of hollow optic fibre 5 is sheathed on capillary glass
In glass pipe 1, mirror based fiber optica 4 does not pass through with 1 welding of glass capillary, hollow optic fibre 5 and 1 welding of glass capillary, mirror based fiber optica 4
Hollow optic fibre 5 is fixed in glass capillary 1.
Further, incident optical 3 and 1 welding of glass capillary, mirror based fiber optica 4 and 5 welding of hollow optic fibre.
Further, the production fixation procedure of mirror based fiber optica 4 is: first cutting flat with one section of 4 one end of mirror based fiber optica, later and wraps
Include but the hollow optic fibre 5 being not limited to be welded together, make mirror based fiber optica 4 and 5 weld of hollow optic fibre have one it is smooth
Then the mirror based fiber optica 4 being welded together with hollow optic fibre 5 is cut to certain length by end face, keep end face smooth；Finally will
Processed mirror based fiber optica 4 is inserted into glass capillary 1, when having certain distance with side 2 positions of opening of glass capillary 1
Hollow optic fibre 5 and glass capillary 1 are fused to together.
Further, the both ends of mirror based fiber optica 4 are sheathed in glass capillary 1.
Further, the internal diameter of glass capillary 1 is 126um, fibre diameter 125um, and optical fiber can be plugged into capillary glass
In glass pipe 1, side opening 2 is rectangle, and gas is facilitated to pass in and out, and the width of side opening 2 is 60um, length 100um.
Further, the inner face of the both ends of the surface of mirror based fiber optica 4 and incident optical 3 is smooth；Incident optical 3 is entire passes
The signal of sensor sends and receives end.
Further, before incident optical 3 is fixed, by mobile incident optical 3, to change incident optical 3 and reflected light
The distance of fine 4 end faces, makes it generate cursor effect, and incident optical 3 is adjusted to after designated position, incident optical 3 is fused to
In glass capillary 1.
Further, the distance between both ends of the surface of mirror based fiber optica 4 are 320um~380um, reflected light in optimum embodiment
The distance between both ends of the surface of fibre 4 are 350um.
Further, the spirit of the controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect
Sensitivity amplification factor are as follows:
In formula (1), FSR1It is the Free Spectral Range that 4 two end faces of mirror based fiber optica are formed, FSR2For 3 end of incident optical
The Free Spectral Range that face and mirror based fiber optica 4 are formed at a distance of nearest end face.
Further, the spirit of the controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect
Sensitivity amplification factor are as follows:
In formula (2), n1For the effective refractive index of mirror based fiber optica 4, L1 is the length of mirror based fiber optica 4, n2For incident optical 3
With effective refractive index of the mirror based fiber optica 4 between nearest end face, L2 is incident optical 3 and mirror based fiber optica 4 at a distance of nearest
The distance between end face.
It further, therefore can be according to the length and incident optical 3 and mirror based fiber optica 4 of mirror based fiber optica 4 at a distance of nearest
The distance between end face controls the amplification factor (amplification factor of the sensitivity i.e. amplification coefficient of sensitivity) of sensitivity, realizes
The measurement of different air pressures.
Further, the calculation formula of Free Spectral Range are as follows:
In formula (3), λ is optical source wavelength, and n is effective refractive index, and L is that Fabry-Perot-type cavity is long；Formula (3) are substituted into
In formula (1), formula (2) can be obtained.
Further, it is by two optical fiber ends that baroceptor of the invention, which is the Fabry-Perot interferometer of extrinsic type,
Face is strictly parallel, coaxial, is sealed in an extraordinary pipeline and forms, and resonant cavity medium is mostly air, and manufacturing process is flexible and convenient,
The smallest measurement pressure of baroceptor of the invention at present is 0.02MPa, peak response 86nm/MPa.
The working principle of the invention:
By the way that by the smooth fused fiber splice in specific length, end face, into glass capillary 1, the other end is inserted into a butt face
Receiving and transmitting terminal of the smooth importing optical fiber as optical signal constitute method cloth there are three the tools being made of three reflectings surface
In-the optical fibre Fabry-perot baroceptor of Perot interference chamber.When air pressure change, the gas in glass capillary 1 is effective
Variations in refractive index causes sensor light spectrum wavelength that corresponding change occurs.The present invention imports optical fiber and glass capillary 1 by changing
The distance of the fiber end face of the other end improves the amplification coefficient of transducer sensitivity so that easily induction generates cursor effect
Reach tens times, such sensor can be adapted for the measurement of different pressures, and expand sensor uses range, have wide
Application prospect, be fitted to obtain the envelope curve of spectrum by software, the variation of envelope curve corresponding wavelength observed, to measure
The variation of air pressure out, theoretically, two Free Spectral Range FSR1And FSR2Between difference it is smaller, the side of sensitivity is big
Multiple is bigger.
Above is only presently preferred embodiments of the present invention, and of course, the scope of rights of the present invention cannot be limited by this,
Therefore according to equivalence changes made by scope of the present invention patent, still belong to protection scope of the present invention.
Claims (9)
1. a kind of controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect, which is characterized in that including hair
Thin glass tube, incident optical and mirror based fiber optica, incident optical and mirror based fiber optica are successively spaced apart in glass capillary, capillary
The side wall of glass tube is equipped with opening, and incident optical and mirror based fiber optica are distributed in the two sides of opening.
2. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 1 based on cursor effect,
It is characterized in that, incident optical and mirror based fiber optica are individually fixed in the both ends of glass capillary.
3. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 2 based on cursor effect,
It is characterized in that, the outer end face of mirror based fiber optica is connected with hollow optic fibre, and one end of hollow optic fibre is sheathed in glass capillary, hollow
Optical fiber and glass capillary welding, mirror based fiber optica are fixed in glass capillary by hollow optic fibre.
4. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 3 based on cursor effect,
It is characterized in that, incident optical and glass capillary welding, mirror based fiber optica and hollow optic fibre welding.
5. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 1 based on cursor effect,
It is characterized in that, the both ends of mirror based fiber optica are sheathed in glass capillary.
6. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 1 based on cursor effect,
It is characterized in that, the both ends of the surface of mirror based fiber optica and the inner face of incident optical are smooth.
7. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 1 based on cursor effect,
Be characterized in that, before incident optical is fixed, by mobile incident optical, thus change incident optical and mirror based fiber optica end face away from
From making its generate cursor effect, incident optical adjusted to behind designated position, incident optical is fused in glass capillary.
8. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 1 based on cursor effect,
It is characterized in that, the sensitivity amplification of the controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect
Multiple are as follows:
In formula (1), FSR1It is the Free Spectral Range that two end faces of mirror based fiber optica are formed, FSR2For incident optical end face and instead
Penetrate the Free Spectral Range that optical fiber is formed at a distance of nearest end face.
9. the controllable sensitivity optical fibre Fabry-perot baroceptor according to claim 8 based on cursor effect,
It is characterized in that, the sensitivity amplification of the controllable sensitivity optical fibre Fabry-perot baroceptor based on cursor effect
Multiple are as follows:
In formula (2), n1For the effective refractive index of mirror based fiber optica, L1 is the length of mirror based fiber optica, n2For incident optical and reflected light
The fine effective refractive index between nearest end face, L2 be incident optical and mirror based fiber optica between nearest end face away from
From.
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| CN115752877A (en) * | 2022-11-10 | 2023-03-07 | 常州厚德再生资源科技有限公司 | Optical fiber relative air pressure sensor applied to regenerated organic resin composite profile device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112014355A (en) * | 2020-09-10 | 2020-12-01 | 浙江师范大学 | Vernier effect-based micro-structure optical fiber gas detection system |
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| 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 |
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| CN115752877A (en) * | 2022-11-10 | 2023-03-07 | 常州厚德再生资源科技有限公司 | Optical fiber relative air pressure sensor applied to regenerated organic resin composite profile device |
| CN115752877B (en) * | 2022-11-10 | 2023-12-15 | 常州厚德再生资源科技有限公司 | Optical fiber relative air pressure sensor applied to regenerated organic resin composite section device |
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