CN2769849Y - Optical measuring device for airosol particulate aerodynamic diameter - Google Patents
Optical measuring device for airosol particulate aerodynamic diameter Download PDFInfo
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- CN2769849Y CN2769849Y CN 200520068263 CN200520068263U CN2769849Y CN 2769849 Y CN2769849 Y CN 2769849Y CN 200520068263 CN200520068263 CN 200520068263 CN 200520068263 U CN200520068263 U CN 200520068263U CN 2769849 Y CN2769849 Y CN 2769849Y
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- measuring device
- particulate
- optical measuring
- aerodynamic diameter
- light path
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Abstract
The utility model discloses an optical measuring device for the aerodynamic diameter of aerosol particulates. The utility model comprises a laser (1), a nozzle (10) and a light detector (8) on light paths (12) of the laser (1), wherein the light paths (12) of the laser (1) are orderly provided with one quarter of wave sheet (3), calcite (6), a cylindrical mirror (7) and one focus of an ellipsoidal mirror (11) for collecting scattered light especially. The nozzle (10) is positioned on the focus of the ellipsoidal mirror (11), and the air injection direction of the nozzle passes through two parallel light paths (12). The light detector (8) is positioned on the other focus of the ellipsoidal mirror (11). A light path (12) between the laser (1) and the one quarter of wave sheet (3) is provided with a collimating lens (2). A light path (12) between the one quarter of wave sheet (3) and the calcite (6) is provided with a negative sphere lens (4) and a positive sphere lens (5). The cylindrical mirror (7) is a negative cylindrical mirror. The utility model can exactly count and measure the number, the size and the distribution state of the concentration of aerosol particulates.
Description
Technical field the utility model relates to a kind of optical measuring device, especially the optical measuring device of particulate aerodynamic diameter.
Background technology is in atmosphere, it is short grained lip-deep mostly pollutant is to be attached to the solid or the liquid that suspend in the air, particulate that is made of these granules and people's life are closely related, and its size, concentration and composition are playing an important role aspect the living environment quality of determining people.To correctly understand the effect of particulate in environment, just must and be distributed with a comprehensively understanding to particle diameter, the concentration of the particle in the atmosphere, could provide corresponding countermeasures on this basis, therefore need measure accurately and count the size and the CONCENTRATION DISTRIBUTION of particulate.The normal at present optics particle diameter that uses light scattering device to measure particulate of people.It is made of the particulate nozzle, the photo-detector that set gradually on laser instrument and its output light path.During measurement,, by way of the output light path of laser instrument the time, will produce scattering to laser beam, thereby on photo-detector, reflect the characteristic of particulate by the particulate of nozzle ejection.But this device exists weak point, at first, surveys the size that scattered intensity is obtained particulate because of it only relies on, so the precision of measuring is not high, is difficult to accurately measure the definite size of particulate; Secondly, be subjected to the influence of the factors such as shape, size of particulate, make its precision have bigger error the measurement of particulate.
The summary of the invention the technical problems to be solved in the utility model is for overcoming weak point of the prior art, and the optical measuring device of particulate aerodynamic diameter a kind of simple in structure, practical, easy to use is provided.
The technical scheme that is adopted comprises nozzle, the photo-detector on laser instrument and its light path, particularly also be disposed with a focus of quarter wave plate, kalzit, cylindrical mirror and ellipsoidal mirror on the light path of said laser instrument, said nozzle is positioned at this focus place of said ellipsoidal mirror, and its jet direction is to pass parallel two-beam road, and said photo-detector is positioned at another focus place of ellipsoidal mirror.
Further improvement as technical scheme is equipped with collimation lens on the light path between described laser instrument and quarter wave plate; Be equipped with negative globe lens and normal position of spherical lens on the light path between described quarter wave plate and kalzit; Described cylindrical mirror is negative cylindrical mirror; Described laser instrument is a diode laser; The perpendicular setting of transmission direction of the jet direction of described nozzle and light path; Be equipped with light absorber on the light path behind the described nozzle.
Beneficial effect with respect to prior art is, one, the quarter wave plate that sets gradually on the laser instrument output light path, kalzit and cylindrical mirror, make laser beam through changing circularly polarized light into by linearly polarized light earlier thereafter, again by being divided into two bundles that intensity equates behind the kalzit, the expansion that all upwards is stretched of last this two-beam in the perpendicular footpath of light path and the jet direction of nozzle, and the Gaussian beam of formation flat ellipse, thereby the movement locus that has guaranteed the particulate that sprays in the nozzle can drop in the focal spot on this two-beam road all the time, scattered intensity and the travel time number that both obtained particulate when making the Gaussian beam that the utility model can pass this two bundles flat ellipse according to particulate, again simultaneously because of obtain the particulate of the different size of identical power at spout, because its inertia difference, the time of flight is just variant, and obtain the definite size of particulate thus, also can therefore know the CONCENTRATION DISTRIBUTION situation of particulate; They are two years old, adopt ellipsoidal mirror to collect scattered light, the interaction area of the double beams laser of particle detection and particulate is positioned at a focus of ellipsoidal mirror, the scattered light of particle is focused at the another one focus by ellipsoidal mirror, and in this focus place arrangement photo-detector, obtain best light scattering signal, improve widely and survey the aerocolloidal sensitivity of small-particle; Its three, the employing of collimation lens and negative globe lens, normal position of spherical lens can make laser beam be easy to focus on the basis that forms the less angle of divergence, is beneficial to follow-up beam splitting; They are four years old, use negative cylindrical mirror, make two-beam expand in the horizontal direction and form two partly overlapping flat ellipse Gaussian beams, the major axis of flat ellipse Gaussian beam is greater than the sample introduction spout, major axis is a symcenter with sample introduction nozzle center axle, even therefore just can avoid making particulate movement locus behind the outgoing spout of same size that small skew be arranged like this because of the disturbance of air-flow, still can record the flight time of particulate, avoid the miscount that produces that departs from of particle movement track that particle causes because of the disturbance of air-flow; Its five, select for use diode laser as probe source, make complete machine simple in structure, volume is little; Its six, the perpendicular setting of transmission direction of the jet direction of nozzle and light path has promoted the efficient of surveying and has reduced error rate; Its seven, the light absorber that the end of light path is provided with has been eradicated useless laser to the interference of photo-detector with to the optical radiation damage of other optical component.
Description of drawings is described in further detail optimal way of the present utility model below in conjunction with accompanying drawing.
Fig. 1 is a kind of basic structure synoptic diagram of the present utility model.
Embodiment is referring to Fig. 1, be equipped with diode laser in the shell 13, on the light path 12 of this diode laser, be equipped with collimation lens 2, quarter wave plate 3, negative globe lens 4, normal position of spherical lens 5, kalzit 6 successively, as the focus and the light absorber 9 of the negative cylindrical mirror of cylindrical mirror 7, ellipsoidal mirror 11 as laser instrument 1; Be equipped with its jet direction at the focus place of this ellipsoidal mirror 11 and be pass parallel two-beam road 12 and with the perpendicular nozzle 10 of the transmission direction of light path 12, another focus place of ellipsoidal mirror 11 is mounted with photo-detector 8.
During use, the linearly polarized laser bundle that diode laser is launched behind collimation lens 2, forms the less uniform beam of the angle of divergence along light path 12 elder generations; This light beam is transformed into circularly polarized light through quarter wave plate 3 again.Afterwards, this circularly polarized light focuses on through negative globe lens 4 and normal position of spherical lens 5 earlier; Be divided into focused spot diameter through kalzit 6 again and be the two bundle directional lights that 60 μ m, spacing are 80 μ m; The back by negative cylindrical mirror with this two bundles directional light all its optical axis with the expansion that upwards is stretched of the perpendicular footpath of the jet direction of nozzle, and the formation xsect is the Gaussian beam of the flat ellipse of major axis 1mm, minor axis 60 μ m.The parallel flat ellipse Gaussian beam of this two bundle is in a focus of the passage in transit ellipsoidal mirror 11 of directive light absorber 9, and meets with the particulate of nozzle 10 ejections that place this focus place, by particulate with its scattering; The photo-detector 8 that is positioned at ellipsoidal mirror 11 another focus places will successively be collected the scattered light of each particulate twice, and transfers to subsequent parts and obtain the definite size of this particulate and all number and the CONCENTRATION DISTRIBUTION situation of particulates according to the time difference between the strong and weak of its output signal and twice same intensity signal.Last two bundle flat ellipse Gaussian beams will be absorbed by light absorber 9.
Obviously, those skilled in the art can carry out various changes and modification to the optical measuring device of particulate aerodynamic diameter of the present utility model and not break away from spirit and scope of the present utility model.Like this, if of the present utility model these are revised and modification belongs within the scope of the utility model claim and equivalent technologies thereof, then the utility model also is intended to comprise these changes and modification interior.
Claims (7)
1, a kind of optical measuring device of particulate aerodynamic diameter, comprise nozzle (10), photo-detector (8) on laser instrument (1) and its light path (12), it is characterized in that also being disposed with on the light path (12) of said laser instrument (1) focus of quarter wave plate (3), kalzit (6), cylindrical mirror (7) and ellipsoidal mirror (11), said nozzle (10) is positioned at this focus place of said ellipsoidal mirror (11), and its jet direction is to pass parallel two-beam road (12), and said photo-detector (8) is positioned at another focus place of ellipsoidal mirror (11).
2, the optical measuring device of particulate aerodynamic diameter according to claim 1 is characterized in that being equipped with collimation lens (2) on the light path (12) between laser instrument (1) and quarter wave plate (3).
3, the optical measuring device of particulate aerodynamic diameter according to claim 1 is characterized in that being equipped with on the light path (12) between quarter wave plate (3) and kalzit (6) negative globe lens (4) and normal position of spherical lens (5).
4, the optical measuring device of particulate aerodynamic diameter according to claim 1 is characterized in that cylindrical mirror (7) is negative cylindrical mirror.
5, the optical measuring device of particulate aerodynamic diameter according to claim 1 is characterized in that laser instrument (1) is a diode laser.
6, the optical measuring device of particulate aerodynamic diameter according to claim 1 is characterized in that the perpendicular setting of transmission direction of the jet direction and the light path (12) of nozzle (10).
7, the optical measuring device of particulate aerodynamic diameter according to claim 1 is characterized in that being equipped with light absorber (9) on the light path (12) behind the nozzle (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068263 CN2769849Y (en) | 2005-01-11 | 2005-01-11 | Optical measuring device for airosol particulate aerodynamic diameter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520068263 CN2769849Y (en) | 2005-01-11 | 2005-01-11 | Optical measuring device for airosol particulate aerodynamic diameter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2769849Y true CN2769849Y (en) | 2006-04-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520068263 Expired - Fee Related CN2769849Y (en) | 2005-01-11 | 2005-01-11 | Optical measuring device for airosol particulate aerodynamic diameter |
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| CN (1) | CN2769849Y (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203584A (en) * | 2008-10-31 | 2011-09-28 | 皇家飞利浦电子股份有限公司 | Device for characterizing the evolution over time of a size distribution of electrically-charged airborne particles in an airflow |
| CN102203584B (en) * | 2008-10-31 | 2016-11-30 | 皇家飞利浦电子股份有限公司 | For characterizing the equipment of the distribution of sizes evolution over time of charged airborne particulate in air stream |
| CN107771277A (en) * | 2015-02-23 | 2018-03-06 | Tsi有限公司 | Condense particle collector spurious count performance |
| CN108303564A (en) * | 2018-03-30 | 2018-07-20 | 煤炭科学技术研究院有限公司 | Air speed measuring apparatus, wind measurement method, device and storage medium |
| CN111426610A (en) * | 2019-01-09 | 2020-07-17 | 广州禾信仪器股份有限公司 | Particulate matter particle size measurement system and mass spectrometer |
-
2005
- 2005-01-11 CN CN 200520068263 patent/CN2769849Y/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102203584A (en) * | 2008-10-31 | 2011-09-28 | 皇家飞利浦电子股份有限公司 | Device for characterizing the evolution over time of a size distribution of electrically-charged airborne particles in an airflow |
| CN102203584B (en) * | 2008-10-31 | 2016-11-30 | 皇家飞利浦电子股份有限公司 | For characterizing the equipment of the distribution of sizes evolution over time of charged airborne particulate in air stream |
| CN107771277A (en) * | 2015-02-23 | 2018-03-06 | Tsi有限公司 | Condense particle collector spurious count performance |
| US10520414B2 (en) | 2015-02-23 | 2019-12-31 | Tsi Incorporated | Condensation particle counter false count performance |
| CN107771277B (en) * | 2015-02-23 | 2020-08-18 | Tsi有限公司 | False count performance of condensation particle counter |
| US10914667B2 (en) | 2015-02-23 | 2021-02-09 | Tsi Incorporated | Condensation particle counter false count performance |
| CN108303564A (en) * | 2018-03-30 | 2018-07-20 | 煤炭科学技术研究院有限公司 | Air speed measuring apparatus, wind measurement method, device and storage medium |
| CN111426610A (en) * | 2019-01-09 | 2020-07-17 | 广州禾信仪器股份有限公司 | Particulate matter particle size measurement system and mass spectrometer |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20060405 |