CN101806725A - 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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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 the analytical technology of gas absorption spectrometry.
Light can be produced specific absorption spectrum by gas absorption, by 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 can provide important reference information 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. then utilizes always, and the gas of concentration is reference wavelength, laser gas analyzer (a kind of laser gas analyzer and scaling method have been carried out calibrating, Chinese patent, CN200810225067.X[P] .2009-04-08).In addition, mostly the demarcation of a lot of spectrometers is to utilize emission lamp (as mercury lamp, sodium vapor lamp etc.) to carry out wavelength scaling, for example, the grade that wipe out in the residence 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 object of the present invention is achieved 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 by the optical fibre light splitting coupling mechanism, the light that light source sends is divided into two-way after entering a standard fiber process optical fibre light splitting coupling mechanism, wherein one road light enters the fibre core that the first suspension optical fiber of specific concentrations gas is contained in inside by first standard fiber, and interact with first gas that hangs in the optical fiber duct, enter first photodiode then; Another Shu Guangwei bias light enters second photodiode through enter the second suspension optical fiber by second standard fiber after; The electric signal of two photodiode generations enters lock-in amplifier and amplifies, and the process testing circuit provides the gas spectral line under specified temp, the specific concentrations at last.
Also can be designed to the monochromatic light line structure, by 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, described duct be shaped as circle or " D " shape, fibre core is close to and is hung on the duct inwall or part is embedded in the covering.
2, described optical fiber is to hang the constant temperature air chamber that optical fiber places 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, open air release after the carrier gas process is finished, make the air chamber internal and external pressure balance finish 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 structure and the length of the first suspension optical fiber and the second suspension optical fiber are consistent, intercept in the adjacent position at same optical fiber.
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 circle or " D " shape, the position, duct can be positioned at each position of inside of optical fibre, the high index of refraction fibre core then is close to the duct inwall and is hung on any certain position in the duct (part is embedded among the covering), 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 enters the fibre core that the suspension optical fiber of specific concentrations gas is contained in inside by standard fiber, and interact with gas in the optical fiber duct, enter photodiode then; Another Shu Guangwei bias light enters another photodiode behind same suspension optical fiber.The electric signal of two photodiode generations enters lock-in amplifier and amplifies, and the process testing circuit provides the gas spectral line under specified temp, the specific concentrations at last.Wherein the monochromatic light road is designed to: by 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 to hang 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, the volume that simplifies the structure design greatly and install, make instrument miniaturization, whole reference unit has light weight, clear superiority such as easy to use.Because the length of the suspension optical fiber of spectrum line reference device can be selected according to specific requirement, thus can significantly increase the evanescent wave area by the length that increases optical 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
Fig. 1 a-c hangs the fiber end face structural representation for three kinds;
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 gas absorption that hangs optical fiber 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 that hangs 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 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 by 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 (as 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.Open air release after the carrier gas process is finished, make 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, the coat that hangs optical fiber and standard single-mode fiber welding end to be removed, and cut, spill flat end face, be welded on the heat sealing machine and finish automatically with the optical fiber cutter.When fused biconical taper, as drawing the awl point, adopt light power meter to monitor welding point, the variation of through-put power takes place along with the deformation of drawing awl point position with a tight waist, when reaching the highest, optical coupling efficiency stops to draw awl.Be enclosed within the tie point outside with quartz socket tube as protective casing at last.
Example one: absorb with reference to the spectral line signal output apparatus based on the methane gas that hangs optical fiber
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 enters 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 enters photodiode 16.Another Lu Guangjing prolongs the photodiode that enters same model with the suspension fiber path of spline structure as reference light.Electric signal enters 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.
With hanging the standard fiber termination that optical fiber links to each other the joints of optical fibre are housed 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.
Example two: based on the gas absorption reference spectrum linear light spectrometer robot scaling equipment that hangs 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, light source, the target spectrometer 21 undetermined that do not contain gas are connected the record background signal.Changing then and hanging optical fiber is that reference gas hangs optical fiber, and note the reference gas absorption signal, drawing known peak position in the absorption line (as 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 by 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 (5)
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 by the optical fibre light splitting coupling mechanism, the light that light source sends is divided into two-way after entering a standard fiber process optical fibre light splitting coupling mechanism, wherein one road light enters the fibre core that the first suspension optical fiber of specific concentrations gas is contained in inside by first standard fiber, and interact with first gas that hangs in the optical fiber duct, enter first photodiode then; Another Shu Guangwei bias light enters second photodiode through enter the second suspension optical fiber by second standard fiber after; The electric signal of two photodiode generations enters lock-in amplifier and amplifies, and the process testing circuit provides the gas spectral line under specified temp, the specific concentrations at last.
2. the gas absorption spectrum line reference device based on suspending core fiber according to claim 1, it is characterized in that: have between the fibre core of described suspension optical fiber and covering one prolong fiber axis to the duct, described duct be shaped as circle or " D " shape, fibre core is close to and is hung on the duct inwall or part is embedded in the covering.
3. the gas absorption spectrum line reference device based on suspending core fiber according to claim 1 and 2, it is characterized in that: described suspension optical fiber is to hang the constant temperature air chamber that optical fiber places 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, open air release after the carrier gas process is finished, make the air chamber internal and external pressure balance finish 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.
4. the gas absorption spectrum line reference device based on suspending core fiber according to claim 1 and 2 is characterized in that: structure and length that the first suspension optical fiber and second hangs optical fiber are consistent, intercept in the adjacent position at same optical fiber.
5. the gas absorption spectrum line reference device based on suspending core fiber according to claim 3 is characterized in that: structure and length that the first suspension optical fiber and second hangs optical fiber are consistent, intercept in the adjacent position at same optical fiber.
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| CN103364370A (en) * | 2013-07-03 | 2013-10-23 | 哈尔滨工程大学 | Annular core optical fiber sensor based on annular chamber decline |
| CN103486975A (en) * | 2013-10-16 | 2014-01-01 | 重庆大学 | Biofilm thickness optical fiber evanescent wave sensor and biofilm sensor system thereof |
| CN104181648A (en) * | 2014-07-07 | 2014-12-03 | 中国科学院上海光学精密机械研究所 | Hollow-photon-crystal-fiber gas absorbing pool and manufacturing method thereof |
| CN104412080A (en) * | 2012-04-05 | 2015-03-11 | 德尔格医疗有限责任公司 | Device and method for fast recording of an absorption spectrum of a fluid |
| CN105549156A (en) * | 2016-01-12 | 2016-05-04 | 哈尔滨工程大学 | Microballoon resonance filter integrated into suspension core fiber |
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| US9939374B2 (en) | 2012-04-05 | 2018-04-10 | Drägerwerk AG & Co. KGaA | Device and method for fast recording of an absorption spectrum of a fluid using a plurality of etalons in combination with a tunable fabry-perot interferometer |
| CN104412080B (en) * | 2012-04-05 | 2017-03-29 | 德尔格制造股份两合公司 | The apparatus and method for promptly receiving liquid absorption spectrum |
| 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 |
| CN103364370A (en) * | 2013-07-03 | 2013-10-23 | 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 |
| CN103486975A (en) * | 2013-10-16 | 2014-01-01 | 重庆大学 | Biofilm thickness optical fiber evanescent wave sensor and biofilm sensor 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 |
| CN104181648A (en) * | 2014-07-07 | 2014-12-03 | 中国科学院上海光学精密机械研究所 | Hollow-photon-crystal-fiber gas absorbing pool and manufacturing method thereof |
| JP2017528742A (en) * | 2014-07-07 | 2017-09-28 | 中国科学院上海光学精密机械研究所 | Hollow core photonic crystal fiber gas cell and manufacturing method thereof |
| CN105549156A (en) * | 2016-01-12 | 2016-05-04 | 哈尔滨工程大学 | Microballoon resonance filter integrated into suspension core fiber |
| CN107907501A (en) * | 2017-10-13 | 2018-04-13 | 中国科学院上海技术物理研究所 | A kind of super continuous integrated spectral of constant low temperature freezes whole blood method |
| 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 |
| CN114964323A (en) * | 2022-07-12 | 2022-08-30 | 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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