CN101806725B - Suspension-core optical fiber-based gas absorption spectrum line reference device - Google Patents
Suspension-core optical fiber-based gas absorption spectrum line reference device Download PDFInfo
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- CN101806725B CN101806725B CN2010101491074A CN201010149107A CN101806725B CN 101806725 B CN101806725 B CN 101806725B CN 2010101491074 A CN2010101491074 A CN 2010101491074A CN 201010149107 A CN201010149107 A CN 201010149107A CN 101806725 B CN101806725 B CN 101806725B
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Abstract
The invention provides a suspension-core optical fiber-based gas absorption spectrum line reference device. Three standard optical fibers are coupled with each other through an optical fiber light-splitting coupler; light emitted from a light source enters a standard optical fiber and is split into two paths after passing through the optical fiber light-splitting coupler, wherein one beam of light enters a fiber core of a first suspension-core optical fiber which contains a gas with specified concentration, interacts with the gas in a pore passage of the suspension-core optical fiber, and enters a photodiode; the other beam of light is background light, and enters another photodiode after passing through the suspension-core optical fiber; electric signals generated by the two photodiodes enter a phase-locked amplifier for amplifying; and a gas spectrum line at the specified temperature and a specified concentration is given through a detection circuit. The device has a simple structure so as to miniaturize an instrument. An evanescent wave area can be increased remarkably by increasing the length of the optical fiber, so that the responsibility of the optical fiber to a reference gas is improved. Therefore, the device is widely applied to spectrum line calibration and spectrum reference on various occasions.
Description
Technical field
The present invention relates to a kind of spectrum line reference device, especially a kind of gas absorption spectrum line reference device.
Background technology
The absorption spectrum of gas has advantages such as selectivity height, characteristic are strong, has the characteristics such as highly sensitive, that the body distinguishing ability is strong, responding ability fast, resistibility that temperature and humidity etc. are disturbed is strong of measuring based on gas absorption spectrum Analysis of measuring technology.
Light can be produced specific absorption spectrum by gas absorption, through demarcating the position of absorption peak, can further discern the kind of gas.So the standard absorption spectral line of gas is not only significant for the discriminating of gaseous species, and also important reference information can be provided to the signal scaling of instrument.For example, Qiao Xueguang etc. utilizes C
2H
2Absorption spectrum is as standard wavelength's reference, to Turnning optical fibre method Fabry-perot filter carry out the wavelength real-time calibration (the high-precision large-range real-time calibration of tunable fabry-perot filter, the optics journal, 2008,28 (5), 852-855).Beijing BAIF-Maihak Analytical Instrument Co., Ltd. utilizes then always that the gas of concentration is reference wavelength, and laser gas analyzer has been carried out calibrating (a kind of laser gas analyzer and scaling method, Chinese patent, CN200810225067.X [P] .2009-04-08).In addition; Mostly the demarcation of a lot of spectrometers is to utilize transmitting lamp (like mercury lamp, sodium vapor lamp etc.) to carry out wavelength scaling, for example, occupies the grade of wiping out and utilizes low pressure Hg etc. that the CCD spectrometer has been carried out Wavelength calibration (the transmitance determination experiment of the wavelength scaling of CCD spectrometer and optical filter; Experiment of College Physics; 2008,21 (31), 66-68).More than the general volume ratio of device of calibration usefulness is bigger, and all has shortcomings such as the light path coupling is complicated, portable difference.
Summary of the invention
The object of the present invention is to provide the integrated gas absorption spectrum line reference device of a kind of structure height based on suspending core fiber.
The objective of the invention is to realize like this:
Comprise light source, coupled connector, optical fibre light splitting coupling mechanism, photodiode, lock-in amplifier, concentration monitor circuit, data-interface; Three standard fibers are of coupled connections through the optical fibre light splitting coupling mechanism; The light that light source sends is divided into two-way after getting into a standard fiber process optical fibre light splitting coupling mechanism; Wherein one road light gets into the inner fibre core that contains the first suspension optical fiber of certain concentration gas through first standard fiber; And interact with gas in the first suspension optical fiber duct, get into first photodiode then; Another Shu Guangwei bias light gets into second photodiode through get into the second suspension optical fiber through second standard fiber after; The electric signal of two photodiode generations gets into lock-in amplifier and amplifies, and provides the gas spectral line under specified temp, the certain concentration through testing circuit at last.
Also can be designed to the monochromatic light line structure, through changing optical fiber, the light that light source sends is respectively through suspension optical fiber that does not contain reference gas and the suspension optical fiber that contains reference gas, through same spectrometer detection signal and handle.
The present invention can also comprise:
1, have between the fibre core of described suspension optical fiber and covering one prolong fiber axis to the duct, said duct be shaped as perhaps " D " shape of circle, fibre core is close to and is hung on the duct inwall or part is embedded in the covering.
2, described optical fiber is the constant temperature air chamber that suspension optical fiber is placed the device of being made up of gas bottle, reduction valve, constant temperature and pressure air chamber, tensimeter, thermometer and air release; Regulate reduction valve; Make the air chamber internal pressure reach setting value, and kept 5-7 days, make the interior gaseous tension of optical fiber reach consistent with air chamber; The carrier gas process is opened air release after accomplishing, and makes the air chamber internal and external pressure balance accomplish carrier gas; To utilize the optical fiber splicer two ends to be connected through the optical fiber that carrier gas is handled with standard single-mode fiber; Make gas be sealed in the suspension inside of optical fibre; Draw awl with fused conic clinker then; Make optical coupling efficiency reach maximal value, the two ends of formation connect the miniature reference gas absorption cell of suspension optical fiber of standard fiber.
3, the first suspension optical fiber is consistent with the structure and the length of the second suspension optical fiber, same optical fiber intercepting in the adjacent position.
The remarkable design feature of the suspension optical fiber that the present invention adopts is that fibre core and covering are clearance fit; Inside of optical fibre has an one-dimensional tunnel structure of prolonging the optic fibre extension direction; The shape of micropore can make perhaps " D " shape of circle; The position, duct can be positioned at each position of inside of optical fibre, and the high index of refraction fibre core then is close to the duct inwall and is hung on any certain position (part is embedded among the covering) in the duct, and this structure is used as the absorption cell that holds gas; The structure that surrounds the duct is the fibre cladding than low-refraction, and the end face of optical fiber is shown in Fig. 1 a-c.A segment standard optical fiber is respectively welded at these suspension optical fiber two ends, is used for optically-coupled and air seal.
Fiber-optic fiber gas spectrum line reference device of the present invention comprises parts such as the wide spectrum light source of containing the reference gas absorption spectrum ranges, coupled connector, optical fibre light splitting coupling mechanism, photodiode, lock-in amplifier, concentration monitor circuit, data-interface.The light path of reference gas absorption line device can be designed as monochromatic light road or double light path according to purposes.Wherein double light path is designed to: the light that light source sends is divided into two-way by optical splitter after dividing optical connector through standard fiber; Wherein a branch of light gets into the inner fibre core that contains the suspension optical fiber of certain concentration gas through standard fiber; And interact with gas in the optical fiber duct, get into photodiode then; Another Shu Guangwei bias light gets into another photodiode behind same suspension optical fiber.The electric signal of two photodiode generations gets into lock-in amplifier and amplifies, and provides the gas spectral line under specified temp, the certain concentration through testing circuit at last.Wherein the monochromatic light road is designed to: through changing optical fiber, the light that light source sends is respectively through suspension optical fiber that does not contain reference gas and the suspension optical fiber that contains reference gas, through same spectrometer detection signal and handle.
The concentration of the gas that the cavity of above-mentioned suspension optical fiber contains is the known quantity under the gas filling temp condition;
The light source of above-mentioned gas spectrum line reference device is selected according to gas absorption wavelength in the covering suspension optical fiber.
The present invention is an absorption cell with suspension optical fiber; Compare with traditional absorption cell and emission type reference instrument; Omitted optical fiber and air chamber beam path alignment, structure such as be of coupled connections; Simplify the structure the greatly volume of design and device makes instrument miniaturization, and whole reference unit has light weight, clear superiority such as easy to use.Because the suspension length of fiber of spectrum line reference device can be selected according to specific requirement, thus can significantly increase the evanescent wave area through increasing length of fiber, and then improve the responsiveness of optical fiber to reference gas.The spectral line that is widely used in multiple occasion is demarcated and the spectrum reference.
Description of drawings
Three kinds of suspensions of Fig. 1 a-c fiber end face structural representation;
Fig. 2 hangs optical fiber carrier gas process synoptic diagram;
Fig. 3 hang optical fiber and standard fiber be of coupled connections, draw the awl and the air seal synoptic diagram;
Fig. 4 based on the suspension optical fiber gas absorption with reference to spectral line signal output apparatus synoptic diagram;
Fig. 5 is based on the gas absorption reference spectrum linear light spectrometer robot scaling equipment synoptic diagram of suspension optical fiber.
Embodiment
For example the present invention is done description in more detail below in conjunction with accompanying drawing:
The optical fiber structure that the present invention relates to is as shown in Figure 1.Optical fiber has fibre core 1 structure of suspension, has the unlimited pore passage structure 2 of naked leakage between fibre core and the covering 3.Fibre core diameter is 10 μ m, cavity diameter 40-50 μ m, and length is 5-10m.
Optical fiber duct internal, carrier gas realizes through Fig. 2 device.This device is made up of gas bottle 4, reduction valve 5, constant temperature, constant voltage air chamber 6, tensimeter 7, thermometer 8, air release 9.To hang optical fiber 10 and place the constant temperature air chamber, regulate reduction valve as requested, and make the air chamber internal pressure reach certain value (like 1atm), and keep 5-7 days, and make the interior gaseous tension of optical fiber reach consistent with air chamber.Temperature shows the temperature value under the carrier gas condition.The carrier gas process is opened air release after accomplishing, and makes the air chamber internal and external pressure balance.
With the optical fiber taking-up and rapidly according to shown in Figure 3, utilize optical fiber splicer to be connected with standard single-mode fiber 11, make gas 12 be sealed in the suspension inside of optical fibre.Draw awl with fused conic clinker then, make optical coupling efficiency reach maximal value, so just formed the miniature reference gas absorption cell of suspension optical fiber of two ends connection standard fiber.
Before welding, to the coat of suspension optical fiber and standard single-mode fiber welding end be removed, and cut, spill flat end face, be welded on the heat sealing machine and accomplish automatically with the optical fiber cutter.When fused biconical taper, as drawing the awl point, adopt light power meter to monitor weld, the variation of through-put power takes place along with the deformation of drawing awl point position with a tight waist,, optical coupling efficiency stops to draw awl when reaching the highest.Be enclosed within the tie point outside with quartz socket tube as protective casing at last.
Instance one: the methane gas based on suspension optical fiber absorbs with reference to the spectral line signal output apparatus
Double light path luminosity compensation method is adopted in the output of gas standard spectral line, both absorption signal light paths that light path is a gas, and a light path is a reference light paths.
It is the InGaSP light emitting diode (PIN) of 1.33 μ m that light source 13 adopts emission wavelength.After light source 3dB fiber coupler 14 (1: the 1) beam split, one road light gets in the inner fibre core of suspension optical fiber welded together with it (core diameter 10 μ m, optical fiber is outer through 125 μ m) through coupled connector 15, standard fiber 11 as flashlight.Light wave produces evanescent wave when fibre core transmits, the evanescent wave field produces absorption with the methane molecule that hangs in the optical fiber absorption cell, and the standard fiber that welds through the other end gets into photodiode 16.Another Lu Guangjing light as a reference prolongs the photodiode that gets into same model with the suspension fiber path of spline structure.Electric signal gets into testing circuit 18 through lock-in amplifier 17.
The method of double light path luminosity compensation requires to measure light path and reference path has good consistance, comprises the initial light intensity of two-way, air chamber structure and size, light path laying or the like.The method of demodulation is: survey the two-way transmitted light simultaneously, and the two is divided by, eliminate the influence of initial light intensity I0, and obtain methane gas standard absorption spectral line.Testing circuit has electrical signal output interface 19, can gather the standard absorption spectral signal of methane, and is connected the analysis reference in order to spectral line calibration or methane gas with Other Instruments.
The joints of optical fibre are equipped with in the standard fiber termination that links to each other with suspension optical fiber in signal light path and the reference path, constitute flexible connection with beam split fiber coupler, photodiode respectively.Can the suspension optical fiber that contain variety classes gas be installed according to the difference of witness mark object like this, obtain the standard absorption spectral line of variety classes gas.Wherein contain between the parameter of suspension optical fiber of variety classes gas and with reference light paths in the parameter of suspension optical fiber between all strict identical.
Instance two: based on the gas absorption reference spectrum linear light spectrometer robot scaling equipment of suspension optical fiber
Light source still adopts InGaSP light emitting diode (PIN), and peak wavelength is 1.33 μ m.This emission wavelength is positioned at CH
4Compound frequency position (v
2+ 2v
3).Gas absorption adopts the design of monochromatic light road with reference to robot scaling equipment; Light source, spectrometer and optical fiber adopt the joints of optical fibre to connect; Whole device is except the suspension optical fiber that contains methane gas; Also comprise a reference optical fiber, its effect is for background correction light, and these two optical fiber structures require identical equally.The suspension optical fiber that does not contain gas, light source, target spectrometer 21 undetermined are connected the record background signal.Changing suspension optical fiber then is reference gas suspension optical fiber; And note the reference gas absorption signal; Drawing known peak position in the absorption line (like 1.33 μ m peak value places) through routine processes concerns with the corresponding spectral line of spectrometer CCD pixel; With the calibration program of computing machine 22 spectrometer is calibrated then, drawn calibration equation.
The suspension optical fiber that contains different reference gases through replacing; Can obtain the standard spectral line of variety classes reference gas; And its known absorbing peak position is accurately reflected on spectrometer; Thereby obtain the wavelength of clearer and more definite spectrometer and the corresponding relation between the CCD pixel, carry out the calibration of different wavelength range.
Claims (3)
1. the gas absorption spectrum line reference device based on suspending core fiber comprises light source, coupled connector, optical fibre light splitting coupling mechanism, photodiode, lock-in amplifier, concentration monitor circuit, data-interface; It is characterized in that: three standard fibers are of coupled connections through the optical fibre light splitting coupling mechanism; The light that light source sends is divided into two-way after getting into a standard fiber process optical fibre light splitting coupling mechanism; Wherein one road light gets into the inner fibre core that contains first suspending core fiber of certain concentration gas through first standard fiber; And interact with gas in the first suspending core fiber duct, get into first photodiode then; Another Shu Guangwei bias light gets into second photodiode after getting into second suspending core fiber through second standard fiber; The electric signal of two photodiode generations gets into lock-in amplifier and amplifies, and provides the gas spectral line under specified temp, the certain concentration through testing circuit at last; Have between the fibre core of described suspending core fiber and covering one along fiber axis to the duct, said duct be shaped as perhaps " D " shape of circle, fibre core is close to and is hung on the duct inwall or part is embedded in the covering.
2. the gas absorption spectrum line reference device based on suspending core fiber according to claim 1; It is characterized in that: described suspending core fiber is the constant temperature air chamber that suspending core fiber is placed the device of being made up of gas bottle, reduction valve, constant temperature and pressure air chamber, tensimeter, thermometer and air release; Regulate reduction valve; Make the air chamber internal pressure reach setting value, and kept 5-7 days, make the interior gaseous tension of optical fiber reach consistent with air chamber; The carrier gas process is opened air release after accomplishing, and makes the air chamber internal and external pressure balance accomplish carrier gas; Utilize optical fiber splicer to be connected with standard single-mode fiber through the optical fiber two ends that carrier gas is handled; Make gas be sealed in suspending core fiber inside; Draw awl with fused conic clinker then; Make optical coupling efficiency reach maximal value, form the miniature reference gas absorption cell of suspending core fiber that two ends are connected with standard fiber.
3. the gas absorption spectrum line reference device based on suspending core fiber according to claim 1 and 2 is characterized in that: first suspending core fiber is consistent with the structure and the length of second suspending core fiber, the intercepting in the adjacent position on same optical fiber.
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| CN2010101491074A CN101806725B (en) | 2010-04-19 | 2010-04-19 | Suspension-core optical fiber-based gas absorption spectrum line reference device |
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| DE102012007030C5 (en) | 2012-04-05 | 2019-01-10 | Drägerwerk AG & Co. KGaA | Apparatus and method for rapidly acquiring an absorption spectrum of a fluid |
| CN103364370B (en) * | 2013-07-03 | 2015-06-17 | 哈尔滨工程大学 | Annular core optical fiber sensor based on annular chamber decline |
| CN103486975B (en) * | 2013-10-16 | 2015-12-23 | 重庆大学 | Biofilm thickness optical evanescent wave sensor device and Biosensor for Detecting Bio-layer system thereof |
| CN104181648B (en) * | 2014-07-07 | 2015-10-28 | 中国科学院上海光学精密机械研究所 | Hollow-Core Photonic Crystal Fibers gas absorption cell and preparation method thereof |
| CN105549156B (en) * | 2016-01-12 | 2019-06-14 | 哈尔滨工程大学 | A kind of microballoon resonance filter being integrated in inside suspending core fiber |
| CN107907501B (en) * | 2017-10-13 | 2020-02-14 | 中国科学院上海技术物理研究所 | Cryopreservation whole blood analysis method of constant low-temperature supercontinuum |
| CN110749549A (en) * | 2019-11-22 | 2020-02-04 | 山东大学 | Device and method for monitoring components and concentration of malodorous gas |
| CN113406036A (en) * | 2021-06-17 | 2021-09-17 | 桂林电子科技大学 | Portable greenhouse gas detection system based on spectrum reconstruction technology |
| CN114964323B (en) * | 2022-07-12 | 2022-10-21 | 中国航空工业集团公司北京长城计量测试技术研究所 | Multi-wavelength optical signal generating device and method |
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