CN206208747U - A kind of concentration sensor that F P chambers are constituted based on fiber end face plated film - Google Patents
A kind of concentration sensor that F P chambers are constituted based on fiber end face plated film Download PDFInfo
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- CN206208747U CN206208747U CN201621311650.9U CN201621311650U CN206208747U CN 206208747 U CN206208747 U CN 206208747U CN 201621311650 U CN201621311650 U CN 201621311650U CN 206208747 U CN206208747 U CN 206208747U
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- optical fiber
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- plated film
- slide
- test chamber
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Abstract
The utility model discloses a kind of concentration sensor that F P chambers are constituted based on fiber end face plated film, by wide spectrum light source, the first optical fiber, the second optical fiber, test chamber, adjustable objective table, slide, detachable dropper, spectroanalysis instrument composition.First optical fiber and the second optical fiber are respectively positioned at the left surface and right flank of test chamber, objective table is located at the bottom of test chamber, slide is placed on objective table, detachable dropper is located at the top of test chamber and just to slide, testing liquid is sucked with dropper, and drop on slide, the light sent by wide spectrum light source, by the F P chambers formed by the first optical fiber plated film end face and the second optical fiber plated film end face, become specific wavelength interference peaks, spectrum is shown on spectroanalysis instrument, because there is linear relationship in the centre wavelength of transmitted spectrum and the refractive index of liquid, by the refractive index of liquid so as to obtain the concentration of liquid.The invention has electromagnetism interference, corrosion-resistant, can multiple Reusability advantage, with good practical value.
Description
Technical field
The present invention proposes a kind of concentration sensor that F-P cavity is constituted based on fiber end face plated film, belongs to detection liquid dense
The technical field of degree.
Background technology
Fibre-optical F-P sensor is widely used because it has series of advantages.According to the demodulation principle of F-P sensors
Understand, the quality of sensor output interference signal quality directly affects the precision and measurement distance of demodulating system, and right
The performance requirement of the light source and photo-detector that constitute demodulating system has large effect.But in practice because light is in F-P cavity
It is inevitably present loss so that sensor signal intensity reduction, poor contrast reduces the certainty of measurement of system.
The raising of sensor mirror based fiber optica end face reflection rate can improve its signal quality, and the end face to F-P sensors is anti-
The rate of penetrating is optimized, and improves its quality of output signals, due to optical fibre Fabry-perot interferometer transmitted spectrum centre wavelength with
In its interference cavity there is linear relationship in the refractive index of medium, it is possible to achieve material refractive index continuous precise is detected, and is had
Electromagnetism interference, the advantages of corrosion-resistant, with good practical value.
Spectroanalysis instrument is the instrument detected to spectral signal, and it has dynamic response fast, and wide dynamic range is sensitive
Degree is high, and equivalent noise bandwidth is small, the advantages of high precision.
The content of the invention
In view of the shortcomings of the prior art, present invention design constitutes the sensor of F-P cavity structure in fiber end face plated film, with saturating
The centre wavelength and refractive index of spectrum are penetrated, reflection wavelength and chamber functional relation long and liquid refractivity are closed with the function of concentration
Based on system, the concentration to liquid carries out accurate measurement；And fiber end face is cleaned by cotton ball soaked in alcohol, it is ensured that optical fiber
The cleaning of end face, also for the measurement of experiment next time improves certainty of measurement.
The present invention is achieved through the following technical solutions：A kind of concentration sensor that F-P cavity is constituted based on fiber end face plated film,
By wide spectrum light source (1), the first optical fiber (2), the second optical fiber (3), test chamber (4), adjustable objective table (5), slide (6) is removable
Unload dropper (7), spectroanalysis instrument (8) composition；First optical fiber (2) and the second optical fiber (3) are respectively positioned at the left surface of test chamber (4)
And right flank, objective table (5) is placed on objective table (5) positioned at the bottom of test chamber (4), slide (6), detachable dropper
(7) positioned at the top of test chamber (4) and just to slide (6), the protecgulum of test chamber (4) can be opened, for removing slide (6)
And the cleaning to the first optical fiber (2) and the second optical fiber (3) end face, testing liquid is sucked with dropper (7), and drop in slide
(6) on, the light sent by wide spectrum light source (1), by by the first optical fiber (2) plated film end face and the second optical fiber (3) plated film end face shape
Into F-P cavity, become specific wavelength interference peaks, spectrum is shown on spectroanalysis instrument (8), due to the centre wavelength of transmitted spectrum
There is linear relationship with the refractive index of liquid, by the refractive index of liquid so as to obtain the concentration of liquid；After detection is finished, can beat
The protecgulum of test chamber (4) is opened, by adjusting the height of objective table (5), slide (6) is removed, and with being stained with spirituous cotton balls
Carry out the cleaning of the first optical fiber (2) and the second optical fiber (3) end face.
The operation wavelength of the wide spectrum light source (1) is 1530nm-1580nm.
Described the first optical fiber (2) and the second optical fiber (3) end face is plating silverskin.
The centre wavelength of first optical fiber (2) and the second optical fiber (3) is 1550nm.
Operation principle of the invention is：Based on the interference pattern of F-P constructive interferences, when polyenergetic directional light is with incidence angle i
When incident, due to the effect of multiple-beam interference, make only have some specific wavelength Xs in certain spectral regionkNearby occur
Greatly, and as i=0 following equation is met：
2nH=k λk (1)
N is liquid refractivity in F-P cavity in formula, and H is that F-P cavity is long, and k is order of interference, λkIt is interference peaks centre wavelength.
To reference fluid is put into test chamber, (known refractive index is n0, correspondence kth level interference peaks centre wavelength is λk0), by
(1) formula obtains refractive index n and interference peaks central wavelength lambdakRelation be：
N=(n0/λk0)λk (2)
From (2) formula, to certain order of interference under specific wavelength, in the change of F-P constructive interference peak transmission wavelengths and chamber
The change of medium refraction index is linear.
Meet condition when the chamber of fiber F-P cavity is long：
H=(2m-1) λb/4neff (3)
N in formulaeffIt is the effective refractive index of optical fiber, m is interference level, and F-P cavity is in λbPlace's transmission peaks are very big.By formula (3)
Trying to achieve chamber H long can seek the length of measured matter.
The refractive index n and strength of fluid size C and temperature T of liquid are relevant, i.e.,：
N=n (C, T) (4)
Differential is carried out to formula (4), the variable quantity that can obtain liquid refractivity is：
In formulaRespectively liquid refractivity with strength of fluid and temperature change sensitivity, for big portion
Divide for liquid, both number of levelss differ 1000 times.Therefore, if in measurement process temperature change less (Δ T be less than 1
~2 DEG C), then the influence of temperature refractive index can be ignored, so that, the change of refractive index is mainly determined by strength of fluid.
The change of strength of fluid is with the relation of refractive index variable quantity：
For refractive index and concentration liquid linear within the specific limits,It is constant, therefore can
Obtain testing liquid concentration be：
So when to different liquids are instilled in test chamber (4), by spectroanalysis instrument (8) output waveform, by simple meter
Calculation can obtain the refractive index and length of liquid, and the concentration of liquid can be obtained by the relation of liquid refractivity and concentration.
The beneficial effects of the invention are as follows：Present invention design constitutes the sensor of F-P cavity structure in fiber end face plated film, with saturating
The centre wavelength and refractive index of spectrum are penetrated, reflection wavelength and chamber functional relation long and liquid refractivity are closed with the function of concentration
Based on system, the concentration to liquid carries out accurate measurement, with very strong novelty and practical value, has good application preceding
Scape.
Brief description of the drawings
Fig. 1 is a kind of concentration sensor structural representation that F-P cavity is constituted based on fiber end face plated film of the invention.
Specific embodiment
As shown in figure 1, a kind of concentration sensor that F-P cavity is constituted based on fiber end face plated film, by wide spectrum light source (1), the
One optical fiber (2), the second optical fiber (3), test chamber (4), adjustable objective table (5), slide (6), detachable dropper (7), spectrum point
Analyzer (8) is constituted；First optical fiber (2) and the second optical fiber (3) are respectively positioned at the left surface and right flank of test chamber (4), objective table
(5) positioned at the bottom of test chamber (4), slide (6) is placed on objective table (5), and detachable dropper (7) is positioned at test chamber (4)
Top and just to slide (6), the protecgulum of test chamber (4) can be opened, for removing slide (6) and to the first optical fiber
(2) and the second optical fiber (3) end face cleaning；Operation principle of the invention is：Testing liquid is sucked with dropper (7), and drops in load
On slide (6), the light sent by wide spectrum light source (1), by by the first optical fiber (2) plated film end face and the second optical fiber (3) plated film end
The F-P cavity that face is formed, becomes specific wavelength interference peaks, spectrum is shown on spectroanalysis instrument (8), due to the center of transmitted spectrum
There is linear relationship in the refractive index of wavelength and liquid, by the refractive index of liquid so as to obtain the concentration of liquid；After detection is finished,
The protecgulum of test chamber (4) can be opened, by adjusting the height of objective table (5), slide (6) is removed, and it is spirituous with being stained with
Cotton balls carries out the cleaning of the first optical fiber (2) and the second optical fiber (3) end face.
Claims (4)
1. a kind of concentration sensor that F-P cavity is constituted based on fiber end face plated film, by wide spectrum light source (1), the first optical fiber (2), the
Two optical fiber (3), test chamber (4), adjustable objective table (5), slide (6), detachable dropper (7), spectroanalysis instrument (8) composition；
, respectively positioned at the left surface and right flank of test chamber (4), objective table (5) is positioned at test chamber for first optical fiber (2) and the second optical fiber (3)
(4) bottom, slide (6) is placed on objective table (5), and detachable dropper (7) is positioned at the top of test chamber (4) and just to carrying
Slide (6), the protecgulum of test chamber (4) can be opened, for removing slide (6) and to the first optical fiber (2) and the second optical fiber (3)
The cleaning of end face；Testing liquid is sucked with dropper (7), and is dropped on slide (6), the light sent by wide spectrum light source (1), passed through
The F-P cavity formed by the first optical fiber (2) plated film end face and the second optical fiber (3) plated film end face, becomes specific wavelength interference peaks, in light
Spectrometer shows spectrum on (8), because the centre wavelength of transmitted spectrum and the refractive index of liquid have linear relationship, by liquid
The refractive index of body is so as to obtain the concentration of liquid；After detection is finished, the protecgulum of test chamber (4) can be opened, by adjusting objective table
(5) height, slide (6) is removed, and carry out the first optical fiber (2) and the second optical fiber (3) end face with spirituous cotton balls is stained with
Cleaning.
2. a kind of concentration sensor that F-P cavity is constituted based on fiber end face plated film according to claim 1, its feature exists
In：First optical fiber (2) and the second optical fiber (3) end face are plating silverskin.
3. a kind of concentration sensor that F-P cavity is constituted based on fiber end face plated film according to claim 1, its feature exists
In：The centre wavelength of the first optical fiber (2) and the second optical fiber (3) is 1550nm.
4. a kind of concentration sensor that F-P cavity is constituted based on fiber end face plated film according to claim 1, its feature exists
In：The operation wavelength of wide spectrum light source (1) is 1530nm-1580nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621311650.9U CN206208747U (en) | 2016-11-29 | 2016-11-29 | A kind of concentration sensor that F P chambers are constituted based on fiber end face plated film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621311650.9U CN206208747U (en) | 2016-11-29 | 2016-11-29 | A kind of concentration sensor that F P chambers are constituted based on fiber end face plated film |
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| Publication Number | Publication Date |
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| CN206208747U true CN206208747U (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621311650.9U Withdrawn - After Issue CN206208747U (en) | 2016-11-29 | 2016-11-29 | A kind of concentration sensor that F P chambers are constituted based on fiber end face plated film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442364A (en) * | 2016-11-29 | 2017-02-22 | 中国计量大学 | Concentration sensor based on F-P (fabry-perot) cavity formed by optical fiber end face coating |
| CN108760710A (en) * | 2018-07-18 | 2018-11-06 | 武汉理工大学 | A kind of water pollution on-Line Monitor Device and its application process based on F-P cavity enhancing |
-
2016
- 2016-11-29 CN CN201621311650.9U patent/CN206208747U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106442364A (en) * | 2016-11-29 | 2017-02-22 | 中国计量大学 | Concentration sensor based on F-P (fabry-perot) cavity formed by optical fiber end face coating |
| CN106442364B (en) * | 2016-11-29 | 2023-04-18 | 中国计量大学 | Concentration sensor based on F-P cavity formed by coating film on end face of optical fiber |
| CN108760710A (en) * | 2018-07-18 | 2018-11-06 | 武汉理工大学 | A kind of water pollution on-Line Monitor Device and its application process based on F-P cavity enhancing |
| CN108760710B (en) * | 2018-07-18 | 2020-11-17 | 武汉理工大学 | F-P cavity enhancement-based water pollution online monitoring device and application method thereof |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170531 Effective date of abandoning: 20230418 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170531 Effective date of abandoning: 20230418 |