CN109490211A - A kind of photoacoustic cell with anti-noise function - Google Patents
A kind of photoacoustic cell with anti-noise function Download PDFInfo
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- CN109490211A CN109490211A CN201811369097.8A CN201811369097A CN109490211A CN 109490211 A CN109490211 A CN 109490211A CN 201811369097 A CN201811369097 A CN 201811369097A CN 109490211 A CN109490211 A CN 109490211A
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- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 4
- 229910000737 Duralumin Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 239000010949 copper Substances 0.000 claims description 4
- 239000011347 resin Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000010146 3D printing Methods 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 238000001514 detection method Methods 0.000 description 11
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 7
- 241001247986 Calotropis procera Species 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
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- 239000008358 core component Substances 0.000 description 1
- -1 cushion chamber Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
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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
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
- G01N21/03—Cuvette constructions
-
- 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
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Abstract
The present invention relates to a kind of photoacoustic cells with anti-noise function, resonant cavity including having resonant cavity, the both ends of resonant cavity are removably secured respectively is connected with a cushion chamber component, the cushion chamber component includes a buffering cavity group for having cushion chamber, two cushion chambers at both ends are connected by resonant cavity and are coaxially distributed, the air inlet of 45 ° of distributions of a light inlet and an inclination is offered in the buffering cavity group of one end, the venthole of 45 ° of distributions of a light-emitting window and an inclination is offered in the buffering cavity group of the other end, air inlet, the cushion chamber that venthole passes through corresponding end respectively is connected to resonant cavity, a quartz window sheet is respectively and fixedly provided at light inlet and light-emitting window.Photoacoustic cell provided by the invention, the air inlet and venthole opened up in its buffering cavity is 45 ° of distributions of inclination, it can preferably make air-flow lenitively from air inlet enters into and through cushion chamber, resonant cavity to venthole goes out, reduce cushion chamber interior air-flow vortex effect, reduce reproduced air-flow noise.
Description
Technical field
The present invention relates to the detection technique field of highly sensitive trace gas, it is specifically related to a kind of with anti-noise function
Photoacoustic cell.
Background technique
With the fast development of modernization industry, environmental pollution is getting worse, and air monitering also increasingly obtains weight
Depending on domestic demands independent research has the gas monitoring techniques and equipment of intellectual property protection, thus for China's environmental quality
Improve and strong science and technology guarantee is provided.
Compared to other gas monitoring techniques, the detection technique of the highly sensitive trace gas of optoacoustic spectroscopy have selectivity it is good,
The advantages that high sensitivity, big dynamic range.Optoacoustic spectroscopy is a kind of Detection Techniques based on photo-thermal physical effect, it is logical
The luminous energy for crossing under test gas absorption specific wavelength is converted to the detection that thermal energy carries out the qualitative and quantitative of under test gas with acoustic pressure.Its
In, most important core component is photoacoustic cell in optoacoustic spectroscopy detection system, and photoacoustic cell is as generation acoustic resonance frequency and carrying
The place of gas, its shape and its construction features directly affect the superiority and inferiority of optoacoustic spectroscopy complete machine detection performance.
Currently, the planform of photoacoustic cell mainly has cylindrical and spherical shape, it is spherical not easy to be processed, thus cylindrical cavity
Type photoacoustic cell is the one kind most generallyd use in optoacoustic spectroscopy detection system.When the frequency modulation(PFM) of external light source and cylindrical type are humorous
When chamber photoacoustic cell sound and vibration frequency of shaking is equal, photoacoustic cell is just in resonance working condition, and the size by detecting sympathetic response acoustic pressure can
The information such as the concentration with inverting under test gas.Cylindrical type resonant cavity photoacoustic cell is simple with structure, processing is simple, installation side
Just, the features such as function admirable.The body format of all kinds of cylindrical type resonant cavity photoacoustic cells is also far from each other, mainly by resonant cavity,
The composition such as cushion chamber, air inlet and venthole, microphone slot, however by the limitation of traditional structure and technical solution, traditional light
The anti-noise ability in sound pond is insufficient, is easy to influence signal-to-noise ratio and the sensitivity of detection system.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of photoacoustic cells with anti-noise function, can reduce cushion chamber
Interior air-flow vortex effect, reduces reproduced air-flow noise.
In order to solve the above technical problems, the present invention is the following technical schemes are provided: a kind of photoacoustic cell with anti-noise function, packet
The resonant cavity with resonant cavity is included, the both ends of the resonant cavity are removably secured respectively is connected with a cushion chamber group
Part, the cushion chamber component include a buffering cavity group for having cushion chamber, and two cushion chambers at both ends are connected by resonant cavity
Lead to and be coaxially distributed, the air inlets of 45 ° of distributions of a light inlet and an inclination are offered in the buffering cavity group of one end, it is another
The venthole of 45 ° of distributions of a light-emitting window and an inclination is offered in the buffering cavity group at end, air inlet, venthole lead to respectively
The cushion chamber for crossing corresponding end is connected to resonant cavity, and a quartz window sheet is respectively and fixedly provided at light inlet and light-emitting window.
Based on the above technical solution, the buffering cavity group includes one removably solid by one end end face
Surely the buffering cavity being connected on resonant cavity end face and one are securely removably connected in buffering cavity the other end face
End cap, the cushion chamber is provided in buffering cavity, and air inlet, venthole extend through corresponding buffering cavity side wall and connect
Pass through cushion chamber；Light inlet, light-emitting window are provided with respectively on the end cap of corresponding end.
Based on the above technical solution, the cushion chamber includes a cylindrical cavity and an exponential curve transition
Shape cavity, cylindrical cavity are connected by exponential curve transition shape cavity with resonant cavity, and air inlet, venthole respectively with it is right
The cylindrical cavity that should be held is connected.
Based on the above technical solution, several acoustic resistance apertures is uniformly provided on the resonant cavity.
Based on the above technical solution, the resonant cavity is rectangular parallelepiped structure, and acoustic resistance aperture is evenly distributed on
On the top surface of resonant cavity and front and back sides.
Based on the above technical solution, the light inlet and light-emitting window are stepped hole shape structure, and quartz window sheet
It is bonded in stepped hole by glue.
Based on the above technical solution, the production material of the buffering cavity is red copper, one in stainless steel, duralumin
Kind.
Based on the above technical solution, the production material of the buffering cavity is resin material, and uses 3D printing
Technology is made.
Based on the above technical solution, the buffering cavity is flange plate structure and passes through fixing screws removably
It is fixedly connected on resonant cavity, end cap is securely removably connected in buffering cavity by fixing screws；And buffering cavity
One end end face and resonant cavity end face between sealing cooperation, the other end face and end cap end face seal cooperate.
Based on the above technical solution, the first rubber of an annular is offered on one end end face of the resonant cavity
The second rubber ring mounting groove of an annular is offered on circle mounting groove, the other end face, is filled in the first rubber ring mounting groove
One first rubber seal, the second rubber ring mounting groove is interior to be filled with one second rubber seal；The buffering cavity corresponding end
The 4th rubber ring mounting groove of an annular is offered on the end face of lid, is filled with one the 4th rubber in the 4th rubber ring mounting groove
Sealing ring.
Compared with the prior art, the invention has the beneficial effects that: photoacoustic cell provided by the invention, in buffering cavity
The air inlet and venthole opened up is 45 ° of distributions of inclination, is compared to the air inlet/outlet opened up on conventional buffer cavity and delays
Rush cavity orthorhombic phase pass through or perpendicular to buffering cavity nose circle face mode, the present invention by into and out of 45 ° of tilt distributions of stomata and
Buffering cavity offers the design of exponential curve transition shape cavity, so that air-flow is lenitively entered and is led to from air inlet
Cross cushion chamber, resonant cavity to venthole goes out, reduce the air-flow vortex effect in cushion chamber, thus reduce air-flow regeneration make an uproar
Sound.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of photoacoustic cell of the present invention；
Fig. 2 is the semi-cutaway of resonant cavity of the present invention；
Fig. 3 is the semi-cutaway of buffering cavity of the present invention；
Fig. 4 is the semi-cutaway of inventive microphone pedestal；
Fig. 5 is the linear relationship schematic diagram of exponential curve transition shape cavity of the present invention；
Figure label are as follows:
101- resonant cavity；The first rubber seal of 102-；The second rubber seal of 103-；104- third rubber seal
Circle；105- acoustic resistance aperture；106- resonant cavity；107- opens sound hole；108- microphone slot；109- cavity；
201- microphone base plate；202- microphone sleeve；203- fastens rubber bush；204- microphone；205- lift span；
206- lead；207- fairlead；208- stop threaded hole；209- dogbolt；
301- buffering cavity；302- exponential curve transition shape cavity；303- cylindrical cavity；304- air inlet；305- goes out
Stomata；The 4th rubber seal of 306-；307- end cap；308- quartz window sheet；
400- light inlet；500- light-emitting window；
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Referring to figs. 1 to shown in Fig. 3, a kind of photoacoustic cell with anti-noise function provided by the invention, including have resonant cavity
106 resonant cavity 101, the both ends of the resonant cavity 101 are removably secured respectively is connected with a cushion chamber component, should
Cushion chamber component includes a buffering cavity group for having cushion chamber, and two cushion chambers at both ends are connected by resonant cavity 106
And be coaxially distributed, the air inlets 304 of 45 ° of distributions of a light inlet 400 and an inclination are offered in the buffering cavity group of one end,
The venthole 305 of 45 ° of distributions of a light-emitting window 500 and an inclination, air inlet are offered in the buffering cavity group of the other end
304, venthole 305 is connected to resonant cavity 106 by the cushion chamber of corresponding end respectively, solid at light inlet 400 and light-emitting window 500
Surely there is a quartz window sheet 308.
Above-mentioned, buffering cavity group includes one and is securely removably connected at 101 end of resonant cavity by one end end face
Buffering cavity 301 and an end cap 307 being securely removably connected in 301 the other end face of buffering cavity on face, institute
It states cushion chamber to be provided in buffering cavity 301, air inlet 304, venthole 305 extend through corresponding 301 side wall of buffering cavity
It is connected to cushion chamber；Light inlet 400, light-emitting window 500 are provided with respectively on the end cap 307 of corresponding end, and light inlet 400 and light out
Mouth 500 is stepped hole shape structure, and quartz window sheet 308 is bonded in stepped hole by glue.
Above-mentioned, buffering cavity 301 is flange plate structure and is securely removably connected at resonant cavity by fixing screws
On 101, end cap 307 is securely removably connected in buffering cavity 301 by fixing screws；And one end of buffering cavity 301
Sealing cooperation, the other end face and 307 end face seal of end cap cooperate between 101 end face of end face and resonant cavity.The resonant cavity
The first rubber ring mounting groove of an annular is offered on one end end face of body 101, the of an annular is offered in the other end face
Two rubber ring mounting grooves, are filled with one first rubber seal 102 in the first rubber ring mounting groove, in the second rubber ring mounting groove
Filled with one second rubber seal 103；The 4th rubber of an annular is offered on the end face of the corresponding end cap of the buffering cavity 301
Cushion rubber mounting groove, the 4th rubber ring mounting groove is interior to be filled with one the 4th rubber seal 306.
Moreover, the cushion chamber includes a cylindrical cavity 303 and an exponential curve transition shape cavity 302, cylinder
Cavity 303 is connected by exponential curve transition shape cavity 302 with resonant cavity 106, and air inlet 304, venthole 305 respectively with
The cylindrical cavity 303 of corresponding end is connected.Wherein, the production material of buffering cavity 301 is red copper, stainless steel or duralumin；?
Or the production material of buffering cavity 301 is resin material, and is made using 3D printing technique.
Referring to Fig. 5, the linear relationship of above-mentioned exponential curve transition shape cavity 302 meets following equation:
Ac--- -- resonant cavity sectional area；
A (x) --- exponential curve transition shape cavity cross-sectional area；
δ --- -- determines a parameter of sectional area variation speed.
Moreover, being uniformly provided with several acoustic resistance apertures 105 on the resonant cavity 101, specifically: the resonant cavity
101 be rectangular parallelepiped structure, and acoustic resistance aperture 105 is evenly distributed on top surface and the front and back sides of resonant cavity 101.
The working principle of photoacoustic cell anti-noise function provided by the invention is: first, the air inlet opened up in buffering cavity 101
304 with venthole 305 be 45 ° of distributions of inclination, is compared to the air inlet/outlet opened up on conventional buffer cavity and buffering cavity
Orthorhombic phase pass through or perpendicular to buffering cavity nose circle face mode, the present invention can preferably be made by the designs of 45 ° of tilt distributions
Air-flow lenitively enters into and through cylindrical cavity 303, exponential curve transition shape 302, resonant cavity 106 to out from air inlet 304
Stomata goes out, and reduces the air-flow vortex effect in cushion chamber, thus reduces reproduced air-flow noise.Second, exponential curve transition
Shape cavity 302 forms smooth surface blending, it is possible thereby to guide air motion, and can reduce the effect of impact of air-flow with
Thus gas flow separation situation plays preferable buffer function to air-flow flowing, further reduces the air-flow of photoacoustic cell
Regenerated noise.Third, 101 case surface of resonant cavity open up several acoustic resistance apertures 105, are the principles based on porous sound absorption to drop
Low extraneous environmental noise interference, when the source noise that is concerned with caused by outside noise includes chopper etc. passes through acoustic resistance aperture 105,
Sound can be converted to thermal energy consumption due to friction in porous and dissipate, and make the opening that microphone 204 is reached by resonant cavity 101
The sound wave at place weakens, and thus will reduce interference of the outside noise to sound pressure signal at 204 acquisition of microphone, improves detection system
Signal-to-noise ratio and sensitivity；Moreover, the bulk material of photoacoustic cell can be removed by opening up acoustic resistance aperture, opposite reduction photoacoustic cell
Overall weight achievees the effect that light-weight design.
Moreover, referring to FIG. 1, FIG. 2 and FIG. 4 it is found that photoacoustic cell provided by the invention, 101 top of resonant cavity are vertical
The microphone slot 108 matched with microphone 204 is offered, and offers connection on resonant cavity 101 in microphone slot
Sound hole 107 is opened between 108 and resonant cavity 106, microphone 204 is inserted into microphone slot 108 in the downward mode of head end；Its
In, the resonant cavity 101 is rectangular-shape structure, resonant cavity 106 and to open sound hole 107 be cylindrical structure；The resonance
The production material of cavity 101 is red copper, stainless steel, duralumin or resin material, and at the polished processing of 106 surface of internal cavity of resonant cavity
Reason guarantees the smoothness of resonance inner cavity surface.
The photoacoustic cell further includes having one to be used to drive microphone 204 along the lifting of 108 lifting moving of microphone slot
Driving assembly；And a cavity 109 is collectively formed between 108 side wall of head end bottom and microphone slot of the microphone 204,
Height h > 0 of the cavity 109, i.e. the head end bottom of microphone 204 are not in contact always with 108 bottom surface of microphone slot.
Above-mentioned lifting driving assembly includes microphone base plate 201, the microphone for having vertical lift span 205
Sleeve 202, one fastens rubber bush 203, lift span 205, microphone sleeve 202, fastening rubber bush 203, microphone slot
108 4 are coaxially distributed, and microphone base plate 201 is securely removably connected at 101 top of resonant cavity, microphone sleeve 202
Liftable is movably attached on microphone base plate 201, is mounted on microphone sleeve to the fastening interference fit of rubber bush 203
In 202, it is mounted in fastening rubber bush 203 to the tail end interference fit of microphone 204, and microphone sleeve 202, fastening rubber
The top of rubber sleeve 203 offers fairlead 207 corresponding with the lead 206 of the tail end of microphone 204；Microphone 204
Head end can up or down pass through lift span 205 be inserted into microphone slot 108 in.
Wherein, the microphone sleeve 202 is threadedly connected on microphone base plate 201；201 outside of microphone base plate
External screw thread is offered on wall, and internal screw thread corresponding with external screw thread, microphone sleeve are offered on 202 inner sidewall of microphone sleeve
202 are threadedly connected on microphone base plate 201 by internal screw thread and externally threaded cooperation realization, using microphone sleeve 202 and
Lifting moving of the microphone sleeve 202 with respect to microphone base plate 201 is realized in threaded connection cooperation between microphone base plate 201,
And then drive microphone 204 along 108 lifting moving of microphone slot.Wherein, the microphone base plate 201 is ring flange knot
Structure, and microphone base plate 201 is securely removably connected at 101 top of resonant cavity by fixing screws.The resonant cavity
Cooperation is sealed between 201 bottom surface of 101 top surfaces and microphone base plate: 101 top surface of resonant cavity offers the third of an annular
Rubber ring mounting groove, the third rubber ring mounting groove is interior to be filled with a third rubber seal 104, and resonant cavity 101 passes through
The third rubber seal 104 realizes that the sealing with microphone base plate 201 cooperates.
It is preferred that the lateral wall bottom end of the microphone base plate 201 offers a stop threaded hole 208, there is one to stop
Dynamic bolt 209 is held out against after threadably passing through the stop threaded hole 208 in microphone 204；When pass through pivoting microphone sleeve
After 202 regulate the height of cavity 109, screws the realization of dogbolt 209 and 204 position of microphone is further fixed, into one
Step ensures the stability of 109 height of cavity；Meanwhile dogbolt 209 also provides one for being rotated down for microphone sleeve 202
A lower limit, when being threaded to contact dogbolt 209 under microphone sleeve 202, microphone 204 is displaced downwardly to lowest order, at this time cavity
109 height still meet h > 0, and in this regard, dogbolt 209 plays the backspin position-limiting action to microphone sleeve 202.
Photoacoustic cell audio frequency provided by the invention is adjustable, acoustic pressure enhancing working principle is: pivoting microphone sleeve 202
It drives microphone 204 to be rotated in the lift span of microphone base plate 201 and in microphone slot 108, and then makes cavity
109 change, and change h value.The cavity height h=0 of traditional optoacoustic spectroscopy detection system and non-adjustable, will so limit
The flexibility and sensitivity of optoacoustic spectroscopy detection system；It is similar that voice range situation is formed by when cavity is non-adjustable, in resonant cavity
In single cylinder body structure, acoustic resonance frequencies value and single cylinder body structure are almost equal, while the work of photoacoustic cell
Make acoustics resonance frequency value be kept fixed it is constant.Photoacoustic cell provided by the invention, cavity height h > 0 and be can be with flexible modulation
, with the variation of cavity, acoustic resonance frequencies value will change, while the variation of h, 204 head end opening of microphone
Sound pressure level will also change, and when h is rationally arranged, the sound pressure level of the opening of microphone 204 will will appear a maximum value, and
And it is greater than sound pressure level when cavity height h is zero, thus the collected acoustic pressure of opening of microphone 204 is enhanced.
The working method of photoacoustic cell provided by the invention is: in the cushion chamber of resonant cavity 106 and buffering cavity 301 full of to
Gas is surveyed, resonant cavity 106 to light-emitting window 500 is entered through from light inlet 400 using the laser beam of specific wavelength and modulation and goes out,
Under test gas absorbs laser light energy and is modulated the influence of light and triggers optoacoustic effect, and the opening of microphone 204 just can
The acoustic pressure for detecting variation, the acoustic pressure when the modulating frequency of laser is equal with the sound and vibration frequency values of resonant cavity, in resonant cavity
It will form standing wave effect, the sound pressure level of the opening of microphone 204 will resonate amplification, demodulate the sound that microphone 204 detects
Situation is pressed, other physical messages such as the concentration of under test gas can be finally inversed by by processing.
Claims (10)
1. a kind of photoacoustic cell with anti-noise function, the resonant cavity (101) including having resonant cavity (106), it is characterised in that:
The both ends of the resonant cavity (101) are removably secured respectively is connected with a cushion chamber component, which includes
There is a buffering cavity group for having cushion chamber, two cushion chambers at both ends are connected and are coaxially distributed by resonant cavity (106), and one
The air inlet (304) of 45 ° of distributions of a light inlet (400) and an inclination is offered in the buffering cavity group at end, the other end
Offered in buffering cavity group a light-emitting window (500) and one inclination 45 ° distribution ventholes (305), air inlet (304),
Venthole (305) is connected to resonant cavity (106) by the cushion chamber of corresponding end respectively, at light inlet (400) and light-emitting window (500)
It is respectively and fixedly provided with a quartz window sheet (308).
2. the photoacoustic cell according to claim 1 with anti-noise function, it is characterised in that: the buffering cavity group includes
One is securely removably connected at buffering cavity (301) on resonant cavity (106) end face by one end end face and one can
The end cap (307) being connected in buffering cavity (301) the other end face is removedly fixed, the cushion chamber is provided with buffering cavity
(301) in, and air inlet (304), venthole (305) extend through corresponding buffering cavity (301) side wall and are connected to cushion chamber；
Light inlet (400), light-emitting window (500) are provided with respectively on the end cap (307) of corresponding end.
3. the photoacoustic cell according to claim 1 with anti-noise function, it is characterised in that: the cushion chamber includes a circle
Cylindrical cavity (303) and an exponential curve transition shape cavity (302), cylindrical cavity (303) are empty by exponential curve transition shape
Chamber (302) is connected with resonant cavity (106), and air inlet (304), venthole (305) respectively with the cylindrical cavity of corresponding end
(303) it is connected.
4. the photoacoustic cell according to claim 1 with anti-noise function, it is characterised in that: on the resonant cavity (101)
It is uniformly provided with several acoustic resistance apertures (105).
5. the photoacoustic cell according to claim 4 with anti-noise function, it is characterised in that: the resonant cavity (101) is
Rectangular parallelepiped structure, and acoustic resistance aperture (105) is evenly distributed on top surface and the front and back sides of resonant cavity (101).
6. the photoacoustic cell according to claim 1 with anti-noise function, it is characterised in that: the light inlet (400) and go out
Optical port (500) is stepped hole shape structure, and quartz window sheet (308) is bonded in stepped hole by glue.
7. the photoacoustic cell according to claim 2 with anti-noise function, it is characterised in that: the buffering cavity (301)
Production material is red copper, stainless steel, a kind of in duralumin.
8. the photoacoustic cell according to claim 2 with anti-noise function, it is characterised in that: the buffering cavity (301)
Production material is resin material, and is made using 3D printing technique.
9. the photoacoustic cell according to claim 2 with anti-noise function, it is characterised in that: the buffering cavity (301) is
Flange plate structure is simultaneously securely removably connected on resonant cavity (101) by fixing screws, and end cap (307) passes through fixed spiral shell
Nail is securely removably connected on buffering cavity (301)；And one end end face of buffering cavity (301) and resonant cavity (101)
Sealing cooperation, the other end face and end cap (307) end face seal cooperate between end face.
10. the photoacoustic cell according to claim 9 with anti-noise function, it is characterised in that: the resonant cavity (101)
The second rubber ring for offering the first rubber ring mounting groove of an annular on the end face of one end, offering an annular in the other end face
Mounting groove, the first rubber ring mounting groove is interior to be filled with one first rubber seal (102), is filled in the second rubber ring mounting groove
One second rubber seal (103)；The 4th rubber of an annular is offered on the end face of the corresponding end cap of the buffering cavity (301)
Mounting groove is enclosed, is filled with one the 4th rubber seal (306) in the 4th rubber ring mounting groove.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811369097.8A CN109490211A (en) | 2018-11-16 | 2018-11-16 | A kind of photoacoustic cell with anti-noise function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811369097.8A CN109490211A (en) | 2018-11-16 | 2018-11-16 | A kind of photoacoustic cell with anti-noise function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109490211A true CN109490211A (en) | 2019-03-19 |
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| CN201811369097.8A Pending CN109490211A (en) | 2018-11-16 | 2018-11-16 | A kind of photoacoustic cell with anti-noise function |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735775A (en) * | 2020-07-15 | 2020-10-02 | 中南民族大学 | Beam waist hyperbolic type photoacoustic cell for gas photoacoustic spectrum detection |
| CN115586151A (en) * | 2022-09-28 | 2023-01-10 | 国网湖北省电力有限公司电力科学研究院 | SF6 decomposition product on-line monitoring device based on laser photoacoustic spectroscopy technology |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101949821A (en) * | 2010-08-12 | 2011-01-19 | 重庆大学 | Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases |
| CN102169085A (en) * | 2010-12-10 | 2011-08-31 | 中国科学院安徽光学精密机械研究所 | Temperature-controlled photo-acoustic absorption spectrum measuring apparatus |
| US20120118042A1 (en) * | 2010-06-10 | 2012-05-17 | Gillis Keith A | Photoacoustic Spectrometer with Calculable Cell Constant for Quantitative Absorption Measurements of Pure Gases, Gaseous Mixtures, and Aerosols |
| CN103308482A (en) * | 2012-03-15 | 2013-09-18 | 中国科学院安徽光学精密机械研究所 | Aerosol scattering and extinction measurement device |
| CN103868853A (en) * | 2014-03-12 | 2014-06-18 | 中国科学院电工研究所 | Radial resonant photo-acoustic cell for monitoring decomposition process of SF6 (sulfur hexafluoride) gas in real time |
| WO2014090518A1 (en) * | 2012-12-14 | 2014-06-19 | Avl List Gmbh | Photoacoustic measurement cell |
| CN104126027A (en) * | 2011-11-22 | 2014-10-29 | 英飞康公司 | Multi-chambered acoustic sensor for determining gas composition |
| CN105241814A (en) * | 2015-10-13 | 2016-01-13 | 安徽皖仪科技股份有限公司 | Apparatus and method for measurement of trace gas with photoacoustic spectroscopy technology |
| CN106092899A (en) * | 2016-05-30 | 2016-11-09 | 华中科技大学 | A kind of based on CO2the self calibration of laser instrument measures SF6the device and method of concentration |
-
2018
- 2018-11-16 CN CN201811369097.8A patent/CN109490211A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20120118042A1 (en) * | 2010-06-10 | 2012-05-17 | Gillis Keith A | Photoacoustic Spectrometer with Calculable Cell Constant for Quantitative Absorption Measurements of Pure Gases, Gaseous Mixtures, and Aerosols |
| CN101949821A (en) * | 2010-08-12 | 2011-01-19 | 重庆大学 | Longitudinal resonant photoacoustic pool for photoacoustic spectrometry monitoring of gases |
| CN102169085A (en) * | 2010-12-10 | 2011-08-31 | 中国科学院安徽光学精密机械研究所 | Temperature-controlled photo-acoustic absorption spectrum measuring apparatus |
| CN104126027A (en) * | 2011-11-22 | 2014-10-29 | 英飞康公司 | Multi-chambered acoustic sensor for determining gas composition |
| CN103308482A (en) * | 2012-03-15 | 2013-09-18 | 中国科学院安徽光学精密机械研究所 | Aerosol scattering and extinction measurement device |
| WO2014090518A1 (en) * | 2012-12-14 | 2014-06-19 | Avl List Gmbh | Photoacoustic measurement cell |
| CN103868853A (en) * | 2014-03-12 | 2014-06-18 | 中国科学院电工研究所 | Radial resonant photo-acoustic cell for monitoring decomposition process of SF6 (sulfur hexafluoride) gas in real time |
| CN105241814A (en) * | 2015-10-13 | 2016-01-13 | 安徽皖仪科技股份有限公司 | Apparatus and method for measurement of trace gas with photoacoustic spectroscopy technology |
| CN106092899A (en) * | 2016-05-30 | 2016-11-09 | 华中科技大学 | A kind of based on CO2the self calibration of laser instrument measures SF6the device and method of concentration |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111735775A (en) * | 2020-07-15 | 2020-10-02 | 中南民族大学 | Beam waist hyperbolic type photoacoustic cell for gas photoacoustic spectrum detection |
| CN115586151A (en) * | 2022-09-28 | 2023-01-10 | 国网湖北省电力有限公司电力科学研究院 | SF6 decomposition product on-line monitoring device based on laser photoacoustic spectroscopy technology |
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