CN108613901B - A kind of gasoloid system - Google Patents
A kind of gasoloid system Download PDFInfo
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- CN108613901B CN108613901B CN201810448523.0A CN201810448523A CN108613901B CN 108613901 B CN108613901 B CN 108613901B CN 201810448523 A CN201810448523 A CN 201810448523A CN 108613901 B CN108613901 B CN 108613901B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
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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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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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
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Abstract
The invention discloses a kind of gasoloid systems comprising: light path module, gas path module, cavity module, photoacoustic spectrum signals processing module, cavity-type BPM signal processing module and control module, gas path module convey protective gas and under test gas；Cavity module two photoacoustic cells between cushion chamber and cushion chamber；Photoacoustic spectrum signals processing module includes microphone, the external amplifier of microphone；Cavity-type BPM signal processing module includes photodetector, photodetector successively external amplifier and capture card；Control module includes the controller controlled electronic component, the computer handled to collected signal and power supply group.By realizing the measurement to the cavity-type BPM and optoacoustic spectroscopy of atmospheric aerosol simultaneously in same cavity, parameter measurement is completed under same ontology, same background, realize that synchronous integrated obtains extinction coefficient, absorption coefficient and the scattering coefficient of aerosol, error is reduced, to accurately obtain the optical property of atmospheric aerosol.
Description
Technical field
The present invention relates to gas monitoring techniques field more particularly to a kind of gasoloid systems.
Background technique
Atmospheric aerosol refers to that the aerial solid of suspension or liquid particle, atmospheric aerosol not only influence atmospheric radiation
And climate change, it has an effect on military, wireless laser communication and environmental area, serious secondary particulate will lead to environmental pollution,
Therefore it grasps its chemical characteristic and has great importance.Carrying out characteristic research to it using optical means is research atmospheric aerosol
The important channel of characteristic is learned, while obtaining Aerosol scattering coefficient, absorption coefficient and extinction coefficient is to obtain aerosol single to dissipate
The important means of the optical properties such as exposure albedo.But atmospheric aerosol has great time and the space rate of change, and uncertain
Larger, when measuring same target on different devices using different technologies, the result obtained will appear biggish error.
Summary of the invention
The present invention provides a kind of gasoloid systems, it is intended to measurement error is reduced, it is molten accurately to obtain atmosphere gas
The optical property of glue.
The present invention provides a kind of gasoloid systems comprising:
Light path module, for providing measurement light beam；
Cavity module, the cavity module include the multiple cushion chambers passed through for the measurement with light beam, the buffering
Photoacoustic cell is equipped between chamber；
Gas path module, for providing measurement gas to the cavity module；
Photoacoustic spectrum signals processing module, the photoacoustic spectrum signals processing module include be connected with the photoacoustic cell it is micro-
Sound device and the lock-in amplifier external with the microphone；
Cavity-type BPM signal processing module, the cavity-type BPM signal processing module includes photodetector, the photodetection
Device is set to the end of the cushion chamber of least significant end on the direction of the measuring beam, the photodetector successively external amplification
Device and capture card；And
Control module, the control module include the controller controlled above-mentioned electronic component, to collected letter
Number computer handled and power supply group.
The embodiment of the present invention by realizing in same cavity to the cavity-type BPM of atmospheric aerosol and optoacoustic spectroscopy simultaneously
Parameter measurement is completed in measurement under same ontology, same background, realizes that synchronous integrated obtains the extinction coefficient of aerosol, inhales
Coefficient and scattering coefficient are received, error is reduced, to accurately obtain the optical property of atmospheric aerosol.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly, below will be to needed in embodiment description
Attached drawing is briefly described, it should be apparent that, drawings in the following description are some embodiments of the invention, general for this field
For logical technical staff, without creative efforts, it is also possible to obtain other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of gasoloid system provided in an embodiment of the present invention；
Fig. 2 is a kind of structural schematic diagram of the adjusting bracket of gasoloid system provided in an embodiment of the present invention；
Fig. 3 is a kind of structural schematic diagram of the fixed frame of gasoloid system provided in an embodiment of the present invention；
Fig. 4 is a kind of structure chart of the cushion chamber of gasoloid system provided in an embodiment of the present invention；
Fig. 5 is a kind of structural schematic diagram of the photoacoustic cell of gasoloid system provided in an embodiment of the present invention；
Fig. 6 is a kind of control schematic diagram of the controller of gasoloid system provided in an embodiment of the present invention；
Fig. 7 is a kind of support bracket fastened structural schematic diagram of gasoloid system provided in an embodiment of the present invention；
Fig. 8 is a kind of structural schematic diagram of the microphone sealing element of gasoloid system provided in an embodiment of the present invention；
Fig. 9 is a kind of module diagram of gasoloid system provided in an embodiment of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair
Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, shall fall within the protection scope of the present invention.
It should be appreciated that ought use in this specification and in the appended claims, term " includes " and "comprising" instruction
Described feature, entirety, step, operation, the presence of element and/or component, but one or more of the other feature, whole is not precluded
Body, step, operation, the presence or addition of element, component and/or its set.
It is also understood that mesh of the term used in this description of the invention merely for the sake of description specific embodiment
And be not intended to limit the present invention.As description of the invention and it is used in the attached claims, unless on
Other situations are hereafter clearly indicated, otherwise " one " of singular, "one" and "the" are intended to include plural form.
It will be further appreciated that the term "and/or" used in description of the invention and the appended claims is
Refer to any combination and all possible combinations of one or more of associated item listed, and including these combinations.
Fig. 1 and Fig. 9 are please referred to, Fig. 1 is a kind of structural schematic diagram of gasoloid system provided in an embodiment of the present invention,
Fig. 9 is a kind of module diagram of gasoloid system provided in an embodiment of the present invention comprising light path module, gas circuit mould
Block, cavity module, photoacoustic spectrum signals processing module, cavity-type BPM signal processing module and control module, light path module are used for
Measurement light beam is provided；Cavity module includes the multiple cushion chambers passed through for the measurement with light beam, is equipped between cushion chamber
Photoacoustic cell；Gas path module is used to provide measurement gas to cavity module；Photoacoustic spectrum signals processing module includes and photoacoustic cell
Connected microphone and the lock-in amplifier external with microphone；Cavity-type BPM signal processing module includes photodetector, light
Electric explorer is set to the end of the cushion chamber of least significant end on the direction of measuring beam, and photodetector successively external amplifier and is adopted
Truck；Control module includes the controller controlled above-mentioned electronic component, the calculating handled collected signal
Machine and power supply group.
By realizing the measurement to the cavity-type BPM and optoacoustic spectroscopy of atmospheric aerosol simultaneously in same cavity, at same
Parameter measurement is completed under body, same background, realizes that synchronous integrated obtains the extinction coefficient, absorption coefficient and scattering system of aerosol
Number reduces error, to accurately obtain the optical property of atmospheric aerosol
Referring to Fig. 1, in a kind of structural schematic diagram of gasoloid system provided in this embodiment, light path module includes
Laser 2 is successively arranged isolator 3 and collimation diaphragm group 6 on the Laser emission direction of laser 2；Gas path module includes being used for
It conveys the first gas path module of protective gas and the second gas path module for conveying under test gas, the first gas path module includes
The storage tank 21 of storage protection gas, the tee tube 22 for shunting the conveyance conduit of protective gas and be set to tee tube
For controlling the flow controller 23,25 of shield gas flow rate on 22 two outlet connecting pipes, the second gas path module includes connecting
The three-way magnetic valve 28 being connected under test gas input channel is successively arranged in the connecting tube of the first outlet of three-way magnetic valve 28
Flow controller 30 and Hygrothermograph 31, what the second outlet connecting tube of three-way magnetic valve 28 was parallel to three-way magnetic valve first goes out
Between mouth and flow controller 30, second outlet connecting tube is equipped with filter 29；Cavity module includes swashing for laser 2
The first cushion chamber 11 and the second cushion chamber 15 that light passes through, and be located between the first cushion chamber 11 and the second cushion chamber 15
Photoacoustic cell 12, the end at the laser light incident end of the first cushion chamber 11 are equipped with the first high reflective mirror 7, and the laser of the second cushion chamber 15 projects
End is equipped with the second high reflective mirror 19, is successively arranged inwardly on the inner wall of the first cushion chamber 11 of the inside of the first high reflective mirror 7 and threeway
The first connected air inlet 24 of the one outlet connecting tube (2101 in figure) of pipe 22 and the second air inlet for inputting under test gas
Mouthfuls 32, another outlet with tee tube 22 is successively arranged on the inner wall of the second cushion chamber 15 of 19 inside of the second high reflective mirror inwardly
The connected third air inlet 26 of connecting tube (2102) and the venthole 33 for extracting under test gas out, the first air inlet 24 and second
Isolation diaphragm (10 and 16) is equipped between air inlet 32 and between third air inlet 26 and gas outlet 33；Photoacoustic spectrum signals
Processing module includes two microphones 13 and 14 being connected with photoacoustic cell 12, and microphone 13 and 14 is circumscribed with lock-in amplifier
3901；Cavity-type BPM signal processing module includes the photodetector set on 15 end of the second cushion chamber in 19 outside of the second high reflective mirror
20, photodetector 20 successively external amplifier 3902 and capture card 3903；Control module includes carrying out to above-mentioned electronic component
The controller 1 of control, the computer 3904 that collected signal is handled and power supply group (4001-4005).
Specifically, before carrying out atmospheric aerosol test, protection is purged into the cavity between high reflective mirror and isolation diaphragm
Gas (cavity between such as the first high reflective mirror 9 and isolation diaphragm 10), in case being protected in follow-up test to high reflective mirror mirror surface
Shield, protective gas enter corresponding cavity from the first air inlet 24 and the second air inlet 26.Under test gas enters from delivery port 27,
Successively through three-way magnetic valve 28, flow controller 30 and Hygrothermograph 31 to third air inlet 32, enter from third air inlet 32
In first cushion chamber 11, in via 12 to the second cushion chamber 15 of photoacoustic cell, finally detached by aspiration pump 34 in gas outlet 33.
After the intracorporal protective gas of entire chamber and under test gas reach pre-provisioning request, start laser 2, the laser of laser 2 is successively
It is injected in cavity via isolator 3 and collimation diaphragm group 6 are horizontal, laser is from the end of the first cushion chamber 11 along the middle line of cavity
Level is injected, and is passed sequentially through the first high reflective mirror 7, isolation diaphragm 10, is passed through the first cushion chamber 11 and enter photoacoustic cell 12, into second
By leaving measurement cavity after isolation diaphragm 16, the second high reflective mirror 19 and Photoelectrical detector 20 after cushion chamber 15.Photoacoustic cell 12
Side wall is set will believe after the collected signal of microphone 13 and 14 enters lock-in amplifier 3901 there are two microphone (13 and 14)
Number being output to computer 3904 is shown.The collected signal of Photoelectrical detector 20 amplifies laggard be delivered to through amplifier 3902
Capture card 3903 will pour into computer 3904 after the digitlization of collected signal via capture card 3903 and show.Passing through
The acquisition of following data can be achieved after systematic survey provided in an embodiment of the present invention,
Specifically, cavity attenuation and vibration technique is based on lambert Bill (lambert-Beer) law, is increased using high reflective mirror multiple reflections
Add the mode of light path to improve detectivity, the expression formula of extinction coefficient calculated by it are as follows:
In expression formula 1-1, αextFor extinction coefficient, d is cavity physical length, and Ls is sample length, and c is the light velocity, τ (v)
For sample gas ring-down time, τ0For background ring-down time.
Specifically, optoacoustic spectroscopy is excited by absorbing, to generate heat during radiationless transition, causes periodicity
Pressure oscillation form sound wave, do not interfered by scattering light etc. factors, pass through the expression formula of its absorption coefficient for calculating under test gas
Are as follows:
In expression formula 1-2: SPAFor photoacoustic spectrum, SmFor microphone response sensitivity, CcellFor the pond of photoacoustic cell
Constant, αabsFor under test gas absorption coefficient, PlaserFor the peak value of laser optical power.
Specifically, operating system, control connect the controlling brancher signal of three-way magnetic valve 28, act three-way magnetic valve 28,
Under test gas does not pass through filter 29, enters cushion chamber by digital mass flow controller 30 and Hygrothermograph 31, at this point,
Under test gas is regarded as the mixed gas of gas and aerosol, the scattering coefficient and suction including aerosol influential on laser
The absorption coefficient of coefficient and specific gas and background is received, specific gas is related to the wavelength used.Chamber measurement is swung at this point, declining
Be mixed gas extinction coefficient, photoacoustic spectroscopy be aerosol, specific gas and background absorption coefficient, the two disappears
Subtract the scattering coefficient as aerosol.The procedure expression of the coefficient of heat transfer of aerosol is obtained with this are as follows:
αMixed ext=αAerosol scat+αAerosol abs+αSpecific gas abs+αBackground (1-3)
αCRD=αMixed ext (1-4)
αPAS=αAerosol abs+αSpecific gas abs+αBackground (1-5)
αAerosol scat=αCRD-αPAS (1-6)
In expression formula (1-3) into (1-6): αMixed extFor the extinction coefficient of mixed gas, αAerosol scatFor aerosol to be measured
Coefficient of heat transfer, αAerosol absFor the absorption coefficient of aerosol to be measured, αSpecific gas absFor the absorption coefficient of specific gas (protective gas),
αBackgroundFor the absorption coefficient for measuring inside cavity background, αPASIt is the absorption coefficient of photoacoustic spectroscopy, is aerosol, specific gas
The sum of body and the absorption coefficient of background, αCRDIt is to decline to swing chamber measurement extinction coefficient, is the extinction coefficient of mixed gas.
Specifically, operating system, control connect 28 controlling brancher of three-way magnetic valve, 1 signal, act three-way magnetic valve 28, to
Gas is surveyed by filter 29, enters cushion chamber by digital mass flow controller 30 and Hygrothermograph 31, is swung at this point, declining
Chamber measurement only specific gas and background absorption coefficient, and mixed gas extinction coefficient difference be aerosol delustring
Coefficient.The deduction procedure expression of the coefficient of heat transfer of aerosol is obtained with this are as follows:
αMixed ext1=αSpecific gas abs+αBackground (1-7)
αAerosol ext=αMix ext-αMix ext1=αAerosol scat+αAerosol abs (1-8)
Scattering coefficient is subtracted since absorption coefficient is equal to extinction coefficient, therefore the difference of above formula and preceding survey scattering coefficient is aerosol
Absorption coefficient, expression formula are as follows:
αAerosol scat=αAerosol ext-αAerosol abs (1-9)
In expression formula (1-7) into (1-9): αMixed ext1For the extinction coefficient of filtered mixed gas, αAerosol scatIt is to be measured
The coefficient of heat transfer of aerosol, αAerosol absFor the absorption coefficient of aerosol to be measured, αSpecific gas absFor the suction of specific gas (protective gas)
Receive coefficient, αBackgroundFor the absorption coefficient for measuring inside cavity background.
Specifically, by realizing the measurement to the cavity-type BPM and optoacoustic spectroscopy of atmospheric aerosol simultaneously in same cavity,
Parameter measurement is completed under same ontology, same background, realizes that synchronous integrated obtains extinction coefficient, the absorption coefficient of aerosol
And scattering coefficient, error is reduced, to accurately obtain the optical property of atmospheric aerosol.
Further, atmospheric aerosol single scattering albedo can also by this programme measurement data obtained,
Single scattering albedo is the ratio of scattering coefficient and total extinction coefficient.
In one embodiment, the first cushion chamber 11 and the second cushion chamber 15 include for fixing and protecting the first high reflective mirror 7
With the fixed frame (9 and 17) of the second high reflective mirror 19, and to the adjusting bracket that the first high reflective mirror 7 and the second high reflective mirror 19 are adjusted
(8 and 18), fixed frame 9 and 17 are connected to the end of the cavity of the first cushion chamber 11 and the second cushion chamber 15, the first air inlet
Mouth 24 and the second air inlet 26 are opened on the side wall of fixed frame 9 and 17.
Specifically, first high reflective mirror 7 of the corresponding fixed protection of fixed frame 9, is set to the end of the first cushion chamber 11, first is high
Anti- mirror 7 is correspondingly provided with the adjusting bracket 8 for high reflective mirror mirror surface to be adjusted, and the first air inlet 24 corresponds to the first high reflective mirror 7
Protective gas is provided；The second high reflective mirror 19 of corresponding fixed protection of fixed frame 17, is set to the end of the second cushion chamber 15, second is high
Anti- mirror 19 is correspondingly provided with the adjusting bracket 18 for high reflective mirror mirror surface to be adjusted, and the second air inlet 26 corresponds to the second high reflective mirror
19 provide protective gas.
Referring to fig. 2, in one embodiment, adjusting bracket (8/18) includes the first fixation hole 801, gasket putting hole 802, light passing
Hole 803 adjusts threaded hole 804 and adjusting rod fixing screwed hole 805, and adjusting bracket (8/18) is by the first fixation hole 801 and admittedly
Determine frame (9/17) to be connected, the self-regulation threaded hole 804 of adjusting rod 806 protrudes into, and adjusting rod 806 passes through adjusting rod fixing screwed hole 805
It is locked, light hole 803 is laser optical path through-hole.
Specifically, adjusting bracket 8 is connected by the first fixation hole 801 with fixed frame 9, and connection can be used in the first fixation hole 801
Screw is attached, and laser is injected from light hole 803, the mirror surface of high reflective mirror is adjusted by adjusting adjusting rod 806, to control
The direction that laser processed is injected.
Referring to Fig. 3, in one embodiment, fixed frame (9/17) includes the second fixation hole 901, right with the first fixation hole 802
The fixing screwed hole 902 answered, seal groove 903, the third fixation hole 904 for fixing high reflective mirror and for disposing fixed circle
4th fixation hole 905 of annular gasket 906, fixed frame 9 are connected by the second fixation hole 901 with the first cushion chamber 11, adjusting rod
806, which protrude into adjusting 7 plane of the first high reflective mirror, control laser in the 4th fixation hole 905, passes through the first high reflective mirror 7 along horizontal centring.
Referring to fig. 4, in one embodiment, the first cushion chamber 11 includes the first fixing hanger 1101, the first seal groove
1102, the 5th fixation hole 1103 corresponding with the second fixation hole 901, the second seal groove 1105 and the 6th fixation hole 1106,
5th fixation hole 1103 is set in the first fixing hanger 1101, is equipped in the first seal groove 1102 for realizing the first cushion chamber
The sealing ring that gas circuit seals between 11 and fixed frame 9, be equipped in the second seal groove 1105 for realizing the first cushion chamber 11 with
The sealing ring that gas circuit seals between photoacoustic cell 12, the 6th fixation hole 1106 is for realizing between the first cushion chamber 11 and photoacoustic cell 12
Connection.
In one embodiment referring to Fig. 5,12 two sides of photoacoustic cell are equipped with photoacoustic cell fixing hanger 1104, photoacoustic cell fixing hanger
The mounting hole fixed with the first cushion chamber 11 and 15 phase of the second cushion chamber and the sealing for disposing sealing ring are offered on 1104
Ring recess, the side wall of photoacoustic cell 12 offer the mounting hole for installing microphone 13 and 14.
In one embodiment referring to Fig. 8, it is equipped with microphone sealing element at mounting hole, microphone installation is offered on sealing element
Hole seal groove 12031, the sealing element fixation hole 12032 for fixing seals and the microphone hole for the close insertion of microphone
12033。
In one embodiment referring to Fig. 6, the output of controller 1 control signal is believed through the switching of four-way connection 107 for the first switching
Number the 101, second tandem signal 102 and third tandem signal 103, the first tandem signal 101 is as modulation laser-branches control
Laser 2, the control of the second tandem signal 102 and third tandem signal 103 as the frequency locking branch of two-way lock-in amplifier 3901
Frequency processed；It is the 4th tandem signal 105 and the 5th tandem signal that controller 1, which exports excitation signal through the switching of three-way connection 108,
106, the 4th tandem signal 105 is as connecing whether the control air inlet of 28 controlling brancher of three-way magnetic valve passes through filter 29, and the 5th turn
Signal 106 is connect as 3 solenoid valve control signal branch of capture card control capture card 3903 is connect, the triggering branch 104 of controller 1 is same
When be used for triggering collection card 3903.
In one embodiment, the signal that microphone 13 and 14 receives enters lock-in amplifier 3901, lock-in amplifier
3901 control through the second tandem signal 102 and third tandem signal 103, output signal to the display of computer 3904.
It further include consolidating for placing chamber module, light path module and gas path module in one embodiment referring to Fig. 7
Fixed rack 35.
Specifically, for fixed bracket 35 for being supported to whole system, fixed bracket 35 is equipped with corresponding above-mentioned optics member
The optical frame of device (such as isolator 3, collimation groups of cables 6), fixed bracket 35 can be for example, by using the bracket at interval, or uses
The disjunctor frame of monoblock type.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (8)
1. a kind of gasoloid system characterized by comprising
Light path module, for providing measurement light beam；
Cavity module, the cavity module include the multiple cushion chambers passed through for the measurement with light beam, the cushion chamber it
Between be equipped with photoacoustic cell；
Gas path module, for providing measurement gas to the cavity module, the gas path module includes for conveying protection gas
First gas path module of body and the second gas path module for conveying under test gas, first gas path module include storage institute
The storage tank for stating protective gas, the tee tube for shunting the conveyance conduit of the protective gas and be set to the threeway
For controlling the flow controller of the shield gas flow rate on two outlet connecting pipes of pipe, second gas path module includes
The three-way magnetic valve being connected on the under test gas input channel, in the first outlet connecting tube of the three-way magnetic valve successively
Equipped with flow controller and Hygrothermograph, the second outlet connecting tube of the three-way magnetic valve is parallel to the three-way magnetic valve
Between first outlet and the flow controller, the second outlet connecting tube is equipped with filter；
Photoacoustic spectrum signals processing module, the photoacoustic spectrum signals processing module include the microphone being connected with the photoacoustic cell
And the external lock-in amplifier with the microphone；
Cavity-type BPM signal processing module, the cavity-type BPM signal processing module includes photodetector, and the photodetector is set
In the end of the cushion chamber of least significant end on the direction of the measuring beam, the photodetector successively external amplifier and
Capture card；And
Control module, the control module include controller, the computer handled to collected signal and power supply group,
The controller is used for the light path module, the gas path module, the photoacoustic spectrum signals processing module and the chamber
The electronic component swung in signal processing module that declines is controlled；
Wherein, the cavity module includes the first cushion chamber and the second cushion chamber passed through for the measurement with light beam, and
The photoacoustic cell being located between first cushion chamber and the second cushion chamber, the end of the light beam incidence end of first cushion chamber
Equipped with the first high reflective mirror, the light beam of second cushion chamber projects end and is equipped with the second high reflective mirror, the first high reflective mirror inside
First cushion chamber inner wall on be successively arranged inwardly be connected with the one outlet connecting tube of the tee tube first into
Port and the second air inlet for inputting under test gas, on the inner wall of second cushion chamber on the inside of second high reflective mirror
It is successively arranged the third air inlet being connected with another outlet connecting pipe of the tee tube inwardly and for extracting under test gas out
Gas outlet, between first air inlet and second air inlet and between the third air inlet and the gas outlet
It is equipped with isolation diaphragm.
2. gasoloid system according to claim 1, which is characterized in that first cushion chamber and described second delays
Rushing chamber includes the fixed frame for fixing and protecting first high reflective mirror and second high reflective mirror, and high to described first
The adjusting bracket that anti-mirror and the second high reflective mirror are adjusted, the fixed frame are connected to first cushion chamber and second buffering
The end of the cavity of chamber, first air inlet and second air inlet are opened on the side wall of the fixed frame.
3. gasoloid system according to claim 2, which is characterized in that the adjusting bracket include the first fixation hole,
Gasket putting hole, light hole adjust threaded hole and adjusting rod fixing screwed hole, and the adjusting bracket passes through first fixation hole
It is connected with the fixed frame, adjusting rod is protruded into from the adjusting threaded hole, and the adjusting rod passes through the adjusting rod fixed thread
Hole is locked, and the light hole is beam path through-hole.
4. gasoloid system according to claim 3, which is characterized in that the fixed frame include the second fixation hole,
Fixing screwed hole corresponding with first fixation hole, seal groove, for fixing first high reflective mirror or the second high reflective mirror
Third fixation hole and the 4th fixation hole for disposing clamping rings shape gasket, the fixed frame it is fixed by described second
Hole is connected with first cushion chamber, and the adjusting rod, which protrudes into, adjusts first high reflective mirror or described in the 4th fixation hole
The plane of second high reflective mirror, control laser pass through first high reflective mirror or second high reflective mirror along horizontal centring.
5. gasoloid system according to claim 4, which is characterized in that first cushion chamber includes first fixed
Hangers, the first seal groove, the 5th fixation hole corresponding with second fixation hole, the second seal groove and the 6th are fixed
Hole, the 5th fixation hole are set in first fixing hanger, are equipped in first seal groove for realizing described the
The sealing ring that gas circuit seals between one cushion chamber and the fixed frame is equipped in second seal groove for realizing described the
The sealing ring that gas circuit seals between one cushion chamber and the photoacoustic cell, the 6th fixation hole is for realizing first cushion chamber
With the connection between the photoacoustic cell.
6. gasoloid system according to claim 1, which is characterized in that the controller output control signal is through four
Pass joint switching is the first tandem signal, the second tandem signal and third tandem signal, and first tandem signal is as modulation
The light beam branch control measurement light beam, second tandem signal and third tandem signal are as the lock-in amplifier
The control frequency of frequency locking branch；The controller output excitation signal is the 4th tandem signal and the 5th turn through three-way connection switching
Signal is connect, the 4th tandem signal, which is used as, connects whether the control air inlet of three-way magnetic valve controlling brancher passes through the filter, institute
The 5th tandem signal is stated as capture card solenoid valve control signal branch is connect and controls the capture card.
7. gasoloid system according to claim 6, which is characterized in that the signal that the microphone receives enters
The lock-in amplifier, the lock-in amplifier are controlled through the second tandem signal and third tandem signal, are outputed signal to described
Computer display.
8. gasoloid system according to claim 1, which is characterized in that the light path module includes laser, institute
It states and is successively arranged isolator and collimation diaphragm group on the Laser emission direction of laser.
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| US7154595B2 (en) * | 2003-12-17 | 2006-12-26 | Picarro, Inc. | Cavity enhanced optical detector |
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| CN103149156B (en) * | 2013-03-19 | 2015-10-07 | 中国气象科学研究院 | Binary channels optical cavity ring-down atmospheric aerosol delustring instrument and measurement of extinction coefficient method |
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| CN104792703B (en) * | 2015-03-17 | 2017-05-31 | 浙江省计量科学研究院 | Detection device for optical absorption coefficient of aerosol based on laser multiple reflections optoacoustic spectroscopy |
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2018
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