CN106769875A - A kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating - Google Patents
A kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating Download PDFInfo
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- CN106769875A CN106769875A CN201610992248.XA CN201610992248A CN106769875A CN 106769875 A CN106769875 A CN 106769875A CN 201610992248 A CN201610992248 A CN 201610992248A CN 106769875 A CN106769875 A CN 106769875A
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- optical fibre
- mode optical
- fundamental mode
- less fundamental
- bragg grating
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
A kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating, is made up of incidence end single-mode fiber with the less fundamental mode optical fibre welding with Bragg grating, and wherein less fundamental mode optical fibre part is coated with silicon fiml；The length of less fundamental mode optical fibre is 4 6cm, and the thickness of silicon fiml is 5 10um；Its preparation methods steps are as follows：1) Bragg grating processed, 2 are write on less fundamental mode optical fibre) welding of single-mode fiber and less fundamental mode optical fibre, 3) silicon fiml is plated on a sensor.It is an advantage of the invention that：The optical fiber gas concentration sensor construction is simple, with low cost, measurement range is big, two kinds of interference peaks are different to the sensitivity characteristic of temperature and gas concentration, current gas concentration and temperature can be calculated by transfer matrix method, there is good application prospect in national defence, industrial production and civil area.
Description
Technical field
The invention belongs to sensory field of optic fibre, particularly a kind of gas concentration based on less fundamental mode optical fibre and Bragg grating is passed
Sensor.
Background technology
21 century is the epoch of high speed information development, this information content in explosive growth epoch, it is sensing technology, logical
Letter technology and computer technology become three big pillars of modern information technologies, and wherein optical fiber sensing technology has also obtained at full speed
Development.Gas sensor mainly includes semiconductor gas sensor, electrochemical gas sensor, infrared gas sensor, light
Fine gas sensor etc..Compared with other kinds of gas sensor, fiber gas sensor has small volume, lightweight, biography
The small, transmission capacity of defeated loss is big, measurement range is wide, electromagnetism interference, corrosion-resistant, chemical stability is good, electrical insulation capability is good, make
Many advantages, such as using long lifespan.
But the fiber gas sensor of many structures is sensitive to temperature, it may appear that the phenomenon of cross sensitivity, so that
The precision of measurement is reduced, the scope of gas sensor application is limited.
The content of the invention
The purpose of the present invention is directed to and above-mentioned there is problem and provide a kind of gas based on less fundamental mode optical fibre and Bragg grating
Concentration sensor, the sensor construction is simple, easily making, and is not influenced by temperature, the value with popularization and application.
Technical scheme：
A kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating, by incidence end single-mode fiber and with cloth
The less fundamental mode optical fibre welding composition of glug grating, wherein less fundamental mode optical fibre part is coated with silicon fiml；The length of less fundamental mode optical fibre is 4-6cm, silicon
The thickness of film is 5-10um.
A kind of preparation method of the gas concentration sensor based on less fundamental mode optical fibre and Bragg grating, step is as follows：
1) Bragg grating processed is write on less fundamental mode optical fibre
Bragg grating processed is write on less fundamental mode optical fibre using phase mask method, the laser warp sent from excimer laser is anti-
Penetrate mirror, post lens and phase mask and converge to modulation less fundamental mode optical fibre fiber core refractive index, post lens and phase mask on less fundamental mode optical fibre
With write-in beam orthogonal, phase mask is 90 degree with the angle of optical fiber axial direction, the position that displacement platform passes through mobile control write-in light beam
Put, the length in Bragg grating grid region is 1cm, and wideband light source monitors Bragg grating jointly with spectrometer when writing grating processed
Write situation processed；
2) welding of single-mode fiber and less fundamental mode optical fibre
The coat of single-mode fiber and less fundamental mode optical fibre is peeled with cutting clamp, is cleaned with alcohol wipe, by single-mode fiber with it is few
Mode fiber is respectively put into heat sealing machine two ends, and welding procedure selection SMF-MMF simultaneously uses automatic welding, and strength of discharge is 100bit,
Discharge time is 3000ms, and single-mode fiber completes welding with less fundamental mode optical fibre after electric discharge；
3) silicon fiml is plated on a sensor
Solution is prepared using sol-gel process：Hydrolyzing tetraethoxy orthosilane is mixed at room temperature with ethanol, is sufficiently stirred for,
During concentration added into mixture for the hydrochloric acid of 0.1mol/L again, the volume ratio of hydrolyzing tetraethoxy orthosilane, ethanol and hydrochloric acid is 10mL:
5mL:1mL, continues to stir, and the solution that will be made put in the vial, and the solution that will be made is coated on sensing head, stop 30 minutes it is complete
After white drying, 8 times processes above are repeated, complete the process of the plated film on sensor head, the thickness of film is 5-10um.
The advantages of the present invention are：
The optical fiber gas concentration sensor construction is simple, with low cost, measurement range big, and two kinds of interference peaks are gentle to temperature
The sensitivity characteristic of bulk concentration be it is different, by transfer matrix method can calculate current gas concentration and temperature, national defence,
Industrial production and civil area have good application prospect.
Brief description of the drawings
Fig. 1 is the sensor construction schematic diagram.
In figure：1. the Bragg grating of 2. less fundamental mode optical fibre of incidence end single-mode fiber, 3. silicon fiml 4..
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Embodiment：
A kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating, as shown in figure 1, by incidence end single-mode optics
Fine 1 constitutes with the welding of less fundamental mode optical fibre 2 with Bragg grating 4, and the wherein part of less fundamental mode optical fibre 2 is coated with silicon fiml 4；Less fundamental mode optical fibre 2
Length be 5cm, the thickness of silicon fiml 4 is 6um.
Light enters less fundamental mode optical fibre 2 from incidence end single-mode fiber 1, is influenceed by less fundamental mode optical fibre 2, and the light in fibre core is excited to
Covering, as it is preceding to core mode and forward direction cladding mode.When both light reach Bragg grating 4, Prague is met
The wavelength of condition reflects, and the core mode of wherein forward direction is reflected into backward core mode, and forward direction cladding mode is reflected into
Backward cladding mode.The light of both backward patterns is coupled to fibre core when reaching less fundamental mode optical fibre 2, by spectrometer measurement knot
Really.
This is based on the preparation method of the gas concentration sensor of less fundamental mode optical fibre and Bragg grating, and step is as follows：
1) Bragg grating processed is write on less fundamental mode optical fibre
Bragg grating processed is write on less fundamental mode optical fibre using phase mask method, the laser warp sent from excimer laser is anti-
Penetrate mirror, post lens and phase mask and converge to modulation less fundamental mode optical fibre fiber core refractive index, post lens and phase mask on less fundamental mode optical fibre
With write-in beam orthogonal, phase mask is 90 degree with the angle of optical fiber axial direction, the position that displacement platform passes through mobile control write-in light beam
Put, the length in Bragg grating grid region is 1cm, and wideband light source monitors Bragg grating jointly with spectrometer when writing grating processed
Write situation processed；
2) welding of single-mode fiber and less fundamental mode optical fibre
The coat of single-mode fiber and less fundamental mode optical fibre is peeled with cutting clamp, is cleaned with alcohol wipe, by single-mode fiber with it is few
Mode fiber is respectively put into heat sealing machine two ends, and welding procedure selection SMF-MMF simultaneously uses automatic welding, and strength of discharge is 100bit,
Discharge time is 3000ms, and single-mode fiber completes welding with less fundamental mode optical fibre after electric discharge；
3) silicon fiml is plated on a sensor
Solution is prepared using sol-gel process：10mL hydrolyzing tetraethoxy orthosilanes are mixed at room temperature with 5mL ethanol, is filled
Point stirring, then 1mL concentration added into mixture for the hydrochloric acid of 0.1mol/L, continuing to stir, the solution that will be made is placed on bottle
In, the solution that will be made is coated on sensing head, after stop is completely dried for 30 minutes, repeats 8 times processes above, is completed in sensing
The process of plated film on device head, the thickness about 5-10um of film.
Found through analysis, light enters less fundamental mode optical fibre 2 from incidence end single-mode fiber 1, is influenceed by less fundamental mode optical fibre 2, in fibre core
Light be excited to covering, as it is preceding to core mode and forward direction cladding mode.Both light reach Bragg grating 4
When, the wavelength for meeting Bragg condition reflects, and the core mode of wherein forward direction is reflected into backward core mode, forward direction bag
Layer model is reflected into backward cladding mode.The light of both backward patterns is coupled to fibre core when reaching less fundamental mode optical fibre 2, occurs in that
Two kinds of interference peaks (core mode of forward direction and backward cladding mode, forward direction cladding mode and backward core mode), this
Two kinds of interference peaks are different to the sensitivity characteristic of temperature and gas concentration, and current gas can be calculated by transfer matrix method
Bulk concentration and temperature, it is to avoid the interference of temperature.
Claims (2)
1. a kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating, it is characterised in that：By incidence end single-mode optics
The fine less fundamental mode optical fibre welding composition with Bragg grating, wherein less fundamental mode optical fibre part is coated with silicon fiml；The length of less fundamental mode optical fibre
It is 4-6cm, the thickness of silicon fiml is 5-10um.
2. a kind of preparation method of the gas concentration sensor based on less fundamental mode optical fibre and Bragg grating as claimed in claim 1,
It is characterized in that step is as follows：
1) Bragg grating processed is write on less fundamental mode optical fibre
Bragg grating processed is write on less fundamental mode optical fibre using phase mask method, the laser sent from excimer laser is reflected
Mirror, post lens and phase mask converge on less fundamental mode optical fibre modulation less fundamental mode optical fibre fiber core refractive index, post lens and phase mask with
Write-in beam orthogonal, the position that displacement platform passes through mobile control write-in light beam, the length in Bragg grating grid region is 1cm, writes system
What wideband light source and spectrometer monitored Bragg grating jointly during grating writes situation processed；
2) welding of single-mode fiber and less fundamental mode optical fibre
The coat of single-mode fiber and less fundamental mode optical fibre is peeled with cutting clamp, is cleaned with alcohol wipe, by single-mode fiber and few mould light
Fibre is respectively put into heat sealing machine two ends, and welding procedure selection SMF-MMF simultaneously uses automatic welding, and strength of discharge is 100bit, electric discharge
Time is 3000ms, and single-mode fiber completes welding with less fundamental mode optical fibre after electric discharge；
3) silicon fiml is plated on a sensor
Solution is prepared using sol-gel process：Hydrolyzing tetraethoxy orthosilane is mixed at room temperature with ethanol, is sufficiently stirred for, then will
Concentration is added in mixture for the hydrochloric acid of 0.1mol/L, and the volume ratio of hydrolyzing tetraethoxy orthosilane, ethanol and hydrochloric acid is 10mL:5mL:
1mL, continues to stir, and the solution that will be made put in the vial, and the solution that will be made is coated on sensing head, stop 30 minutes it is completely dry
After dry, 8 times processes above are repeated, complete the process of the plated film on sensor head, the thickness of film is 5-10um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610992248.XA CN106769875A (en) | 2016-11-11 | 2016-11-11 | A kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating |
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| CN201610992248.XA CN106769875A (en) | 2016-11-11 | 2016-11-11 | A kind of gas concentration sensor based on less fundamental mode optical fibre and Bragg grating |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108507477A (en) * | 2018-05-04 | 2018-09-07 | 北京交通大学 | A kind of thermal cracking sensor based on less fundamental mode optical fibre and fiber bragg grating |
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| US20050259697A1 (en) * | 2004-05-24 | 2005-11-24 | Korea Institute Of Science And Technology | Raman or erbium-doped fiber laser using few-mode fiber grating, and long-distance remote sensor for simultaneously measuring temperature and strain by separating temperature and strain components using the same |
| CN101832924A (en) * | 2010-05-11 | 2010-09-15 | 电子科技大学 | Refractivity sensor and preparation method thereof based on micro-core optical fiber Bragg grating |
| CN103822901A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | Hydrogen concentration and environmental temperature double-parameter measuring device based on tilted fiber bragg grating |
| CN103928829A (en) * | 2014-04-17 | 2014-07-16 | 吉林大学 | High-order mode obtaining device based on few-mode fiber Bragg grating |
| CN103940349A (en) * | 2014-05-20 | 2014-07-23 | 天津理工大学 | Micro-displacement sensor based on spherical optical fiber and Bragg grating cascade |
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| US20050259697A1 (en) * | 2004-05-24 | 2005-11-24 | Korea Institute Of Science And Technology | Raman or erbium-doped fiber laser using few-mode fiber grating, and long-distance remote sensor for simultaneously measuring temperature and strain by separating temperature and strain components using the same |
| CN101832924A (en) * | 2010-05-11 | 2010-09-15 | 电子科技大学 | Refractivity sensor and preparation method thereof based on micro-core optical fiber Bragg grating |
| CN103822901A (en) * | 2014-03-10 | 2014-05-28 | 天津理工大学 | Hydrogen concentration and environmental temperature double-parameter measuring device based on tilted fiber bragg grating |
| CN103928829A (en) * | 2014-04-17 | 2014-07-16 | 吉林大学 | High-order mode obtaining device based on few-mode fiber Bragg grating |
| CN103940349A (en) * | 2014-05-20 | 2014-07-23 | 天津理工大学 | Micro-displacement sensor based on spherical optical fiber and Bragg grating cascade |
| CN106025775A (en) * | 2015-03-26 | 2016-10-12 | 恩耐公司 | Fiber source with cascaded gain stages and/or multimode fiber with low splice loss |
| CN105928549A (en) * | 2016-06-03 | 2016-09-07 | 南京邮电大学 | Cascaded few-mode fiber-based multi-physical quantity active optical fiber sensor and sensing method |
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Application publication date: 20170531 |