CN1009489B - photoacoustic effect type analyzer - Google Patents
photoacoustic effect type analyzerInfo
- Publication number
- CN1009489B CN1009489B CN85104620A CN85104620A CN1009489B CN 1009489 B CN1009489 B CN 1009489B CN 85104620 A CN85104620 A CN 85104620A CN 85104620 A CN85104620 A CN 85104620A CN 1009489 B CN1009489 B CN 1009489B
- Authority
- CN
- China
- Prior art keywords
- microphone
- receiving part
- sound receiving
- gas
- photoacoustic effect
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000010895 photoacoustic effect Methods 0.000 title abstract description 4
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 230000003760 hair shine Effects 0.000 claims description 2
- 238000005260 corrosion Methods 0.000 abstract description 4
- 230000007797 corrosion Effects 0.000 abstract description 4
- 230000035945 sensitivity Effects 0.000 abstract description 4
- 238000009423 ventilation Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 16
- 239000000523 sample Substances 0.000 description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000012488 sample solution Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
A photoacoustic effect type analyzer having a detection tube (1) with a ventilation duct (17) through which a gas such as dry air flows to the vicinity of a sound receiving part (10a) of a microphone (10) for detecting a change in the internal pressure of a sample gas in the tube (1) to prevent the sample gas from directly contacting the sound receiving part (10a), ensuring detection sensitivity of the microphone (10) and preventing corrosion.
Description
The present invention is about a kind of photoacoustic effect-type analyzer, the concentration that wherein feeds solids specific in the measured gas of photo-acoustic detection pipe (for example, resemble the concentration of the carbon black particle in the automobile exhaust gas) and resemble ammonia, the concentration of the gas molecule that ethylene gas and ozone are so all adopts optoacoustic effect sound to measure.
Optoacoustic effect is a kind of like this effect, that is, when a kind of gas imports the detector tube with airtight construction, simultaneously, when shining sample air off and on a kind of light, owing to sample has absorbed light the pressure in the detector tube is changed.Because the variation of pressing in the pipe is directly proportional with the luminous energy that sample is absorbed, so sample solution concentration can be measured out by the force value of the detected variation of microphone.
In order to utilize microphone to detect the variation of pressure in the pipe, the sound receiving part of microphone must be connected in the pipe.For this reason, should process a hole on the detector tube and lead in the sidewall, in the microphone patchhole, inner towards pipe the sound reception parts.
In the inner place that is connected of microphone and detector tube, sample and gas (below be referred to as sample air) and the sound receiving part of microphone directly come in contact, therefore, cause following shortcoming to produce, promptly, the moisture and the similar substance that are present in the sample air can bond on the sound receiving part, cause the variation of sensitivity of microphone or produce corrosion.
The present invention is intended to eliminate the shortcoming in the above-mentioned prior art, specific practice is connected on the detector tube inwall for the sound receiving part with microphone, stop sample air directly to be in contact with it, guarantee that the pressure change-detection of utilizing microphone to carry out is working properly in detector tube.
In other words, be characterised in that according to photoacoustic effect-type analyzer of the present invention gas (as the air of drying) flows near the variation to press in detecting in the photo-acoustic detection pipe of the sound receiving part of microphone, can stop the sample air in the pipe to contact with the sound receiving part of microphone.
Referring to accompanying drawing, (1) represents the photo-acoustic detection pipe, and this pipe comprises that a central tube body (2) links to each other with central tube body in the airtight mode of height with left and right body (3), (4), left and right body.Body (1) center is pipe chamber (5), pipe chamber (5) is an enclosed construction, its sealing is to realize by window of tube (6), (7) at its two ends, and sample air inlet (8) is arranged on body (3), and sample air outlet (9) is arranged on the right body (4).Beam of laser shines on the sample air by sample air inlet (8) ingress pipe chamber (5) by window of tube (6) or (7).
(10) represent one to be positioned at pack into recess (12) that central tube body (2) go up to form and adopt the securing member of bolt one class to be fixed of Microphone stand (11).One hole (13) is arranged on the Microphone stand (11), and a hole (14) is arranged on the central tube body (2), and the inside of pipe chamber (5) is communicated with the sound receiving part (10a) of microphone (10).One liner (15) be contained in microphone (10) around.Fixed head (16) is contained in the last impermeability with holding tube chamber (5) of liner (15).
(17) represent the pipeline of circulated gases (as dry air), the top of above-mentioned pipeline (17) is passed fixed head (16) and is communicated with by near the hole (13) of Microphone stand (11) and the sound receiving part that is positioned at microphone (10a).Pressure control valve (19) in one kapillary (18) and the tubular stinger is housed so that quantitative gas (as dry air) to be provided when needed on the pipeline (17) near the sound receiving part of microphone.The gas that flows through pipeline (17) is not limited to dry air, anyly contains the gas that small amount of moisture do not contain corrosion microphone material and all can use.
According to said structure, because the sound receiving part (10a) of microphone is communicated with by hole (13) and (14) with pipe chamber (5), and the gas as dry air is carried by pipeline (17), so just can stop sample air directly to contact with the sound receiving part (10a) of microphone.Therefore, can prevent that sealing adheres on the microphone (10), like this, just can prevent that microphone is subjected to corrosion and sensitivity descends.In addition, because the gas that provides by pipeline (17) is to enter pipe chamber (5) and export (9) by sample air by hole (13) and (14) to discharge, sample air is diluted along with the inflow pipe chamber (5) of a part of gas (as dry air), therefore, inherent variation reduces by the letter number of dilution, but the value that detects only is reduced to a certain definite value, like this, detected value is easy to proofread and correct, as a result, because the circulation of gas such as dry air always controls to a constant by kapillary (18) and pressure control valve (19).Measuring error just can not produce.
As mentioned above, according to the present invention, since gas (as dry air) flow to microphone sound receiving part near, therefore, not only stoped sample air directly to contact with the sound receiving part of microphone but also the sound receiving part that kept microphone with manage the version that chamber interior is connected.Like this, not only can detect pressure variation while of managing in the chamber but also the change of sensitivity that has prevented microphone effectively and corroded.
Accompanying drawing is for showing the sectional view of the preferred embodiment of the invention.
(1) ... the photo-acoustic detection pipe
(10) ... microphone
(10a) ... sound receiving part
Claims (1)
1, a kind of photoacoustic effect-type analyzer comprises a detector tube, one produces the light source of the light that shines sample air and the microphone that test samples pressure changes, this analyzer is characterised in that gas (as dry air) flows near the sound receiving part branch of the microphone that detects the variation of photo-acoustic detection pipe internal pressure, makes the sample air of pipe directly not contact with the sound receiving part of microphone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104620A CN1009489B (en) | 1985-06-15 | 1985-06-15 | photoacoustic effect type analyzer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN85104620A CN1009489B (en) | 1985-06-15 | 1985-06-15 | photoacoustic effect type analyzer |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN85104620A CN85104620A (en) | 1986-12-10 |
| CN1009489B true CN1009489B (en) | 1990-09-05 |
Family
ID=4793959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN85104620A Expired CN1009489B (en) | 1985-06-15 | 1985-06-15 | photoacoustic effect type analyzer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1009489B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7034943B1 (en) * | 2000-03-03 | 2006-04-25 | Aritron Intrumente AG | Gas sensors |
| FI118548B (en) * | 2002-09-30 | 2007-12-14 | Noveltech Solutions Ltd | Photoacoustic detector |
| FI116859B (en) * | 2002-09-30 | 2006-03-15 | Noveltech Solutions Ltd | Photoacoustic detector |
| AT6894U3 (en) * | 2004-01-28 | 2005-01-25 | Avl List Gmbh | MEASURING CHAMBER FOR PHOTOACOUS SENSORS |
| US7797983B2 (en) * | 2004-03-29 | 2010-09-21 | Gasera Ltd. | Method and system for detecting one or more gases or gas mixtures and/or for measuring the concentration of one or more gases or gas mixtures |
| CN102830084A (en) * | 2012-08-28 | 2012-12-19 | 苏州斯坦福仪器有限公司 | Sensor for online concentration detection of atmospherical inhalable particles |
| US9696283B1 (en) * | 2016-10-11 | 2017-07-04 | Aerodyne Research, Inc. | Apparatus and methods for photoacoustic measurement of light absorption of particulate and gaseous species |
-
1985
- 1985-06-15 CN CN85104620A patent/CN1009489B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CN85104620A (en) | 1986-12-10 |
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Legal Events
| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C13 | Decision | ||
| GR02 | Examined patent application | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |