CN102692366A - Instrument for monitoring microparticles in air - Google Patents
Instrument for monitoring microparticles in air Download PDFInfo
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- CN102692366A CN102692366A CN2012101959825A CN201210195982A CN102692366A CN 102692366 A CN102692366 A CN 102692366A CN 2012101959825 A CN2012101959825 A CN 2012101959825A CN 201210195982 A CN201210195982 A CN 201210195982A CN 102692366 A CN102692366 A CN 102692366A
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Abstract
The invention discloses an instrument for monitoring microparticles in air. A laser beam generated by a laser source is collimated by a collimator and then transformed into a collimated flat strip beam by a slit diaphragm, microparticles in air to be monitored are irradiated by the collimated flat strip beam to generate scattered light, the scattered light is gathered and reflected to a light signal collecting plate by a concave total reflection mirror, the particle diameters of the microparticles in the air to be monitored are judged according to the sizes of light signals collected by the light signal collecting plate, and the mass of the microparticles is then obtained through specific quality coefficient conversion. With the adoption of the collimated flat strip beam, the time consumed when the particles pass through the beam is reduced, the overlapping of the particles is avoided, and the signal-to-noise ratio of the signals is increased.
Description
Technical field
the present invention relates to a kind of optical instrument, are specifically related to a kind of air finely ground particles monitoring instrument.
Background technology
It is the main cause that causes grey haze weather that
particulates thing pollutes; And particularly PM2.5 (being less than or equal to 2.5 micron particles things) pellet can impact the health of human body, mainly respiratory system and cardiovascular system damaged.And the more little harm to human body of particle diameter is big more.The monitoring of air finely ground particles is significant with the protection human health to administering environment.
The method of
present domestic Measurement of Air finely ground particles mainly contains: (1) filter membrane weight method, and this method principle is simple, and dust proof rate is high, and measurement result is reliable, but needs manual work to weigh, and complex operation, time-consuming can not be realized automatic measurement; (2) β radiation absorption method, this method measuring system reliable operation, but discontinuous measurement; Also continuous coverage automatically; But there is potential safety hazard in this method, requires the in-site measurement personnel to have higher quality, and system also need increase various shielding measures; The structure more complicated of equipment generally is applicable to the occasion of special measurement requirement; (3) micro-vibration sedimentation balance method, this method is measured the particle of different-grain diameter scope through joining different cutters, and measuring accuracy is high, and real-time is good, and for PM2.5, this method needs the higher accessory kit of precision, and measurement receives the influence of temperature, humidity bigger; (4) light scattering method, this method measuring speed is fast, good reproducibility, automaticity is high, can on-line continuous measure.
light scattering method has been widely used in the monitoring of dust particle under the clean environment, and technological comparative maturity.Utilize that finely ground particles communicates with the principle of dust particle in the measurement clean environment in the light scattering method monitoring atmosphere; Both main difference points are: the concentration of dust particle often is not very high (the general monitoring range of private counter is at 350000/cubic metre) under the clean environment, and in the atmosphere concentration of pellet often greater than 350000/cubic metre.Because the concentration of tested pellet is bigger in the atmosphere, when adopting the light scattering method monitoring, particle and particle overlap easily, influence each other, and the signal to noise ratio (S/N ratio) of the signal that causes collecting is lower.
Summary of the invention
the purpose of this invention is to provide a kind of instrument that utilizes light scattering to monitor air finely ground particles particulate character; Particularly to particle diameter smaller or equal to the particle (PM1) of 1 μ m, particle diameter smaller or equal to 2.5 μ m (PM2.5), particle diameter monitoring smaller or equal to 10 μ m (PM10); This instrument utilizes slit diaphragm to change laser beam into long and narrow bandlet light beam; Make airborne finely ground particles to be measured pass through the time decreased of bandlet light beam; It is overlapping to avoid that particle takes place, to improve the signal to noise ratio (S/N ratio) of the signal of gathering.
For achieving the above object, the technical scheme that the present invention adopts is: air finely ground particles monitoring instrument and monitoring method comprise:
LASER Light Source;
The collimating apparatus of the laser beam of can the said LASER Light Source of collimation launching;
Can the laser beam behind said collimating device collimation be changed into the slit diaphragm of collimation bandlet light beam;
Can aspirate air to be measured and make the air-flow of this air to be measured along passing the air-breathing pump or fan of this collimation bandlet light beam with wide perpendicular direction of said collimation bandlet light beam;
The light signal collection plate;
Can the scattered beam that said airborne finely ground particles to be measured forms after by said collimation bandlet light beam irradiates be converged and reflex to the concave mirror on the said light signal collection plate; Said light signal collection plate is positioned at the along on the main shaft of said concave mirror; The main shaft of said concave mirror is all perpendicular with the direction of illumination of the air current flow direction of said air to be measured, said collimation bandlet light beam, and the main shaft of said concave mirror passes the air-flow of said air to be measured and the zone that said collimation bandlet light beam intersects;
Be positioned at the relative side of said LASER Light Source and can eliminate the delustring trap that absorbs said collimation bandlet light beam;
When airborne finely ground particles to be measured was monitored in said monitoring instrument in
, the periphery of said air to be measured was provided with the protection air-flow.
are because the utilization of technique scheme; The present invention compared with prior art has advantage: in this air molecule monitoring instrument; Change the laser beam behind collimating device collimation into collimation bandlet light beam through slit diaphragm; Particulates thing time of passing light beam can reduce like this, thereby has avoided the overlapping of particle, has improved the signal to noise ratio (S/N ratio) of acquired signal.
Description of drawings
accompanying drawing 1 is a synoptic diagram of the present invention.
Embodiment
Structure of the present invention is further set forth below in conjunction with accompanying drawing in
.
are referring to shown in Figure 1; A kind of air finely ground particles monitoring instrument comprises LASER Light Source 1, collimating apparatus 2, slit diaphragm 3, concave surface completely reflecting mirror 4, is positioned at the light signal collection plate 5 of concave surface completely reflecting mirror 4 along, the delustring trap 6 that is positioned at the relative side of LASER Light Source, air-breathing pump or fan (not shown); The laser beam that LASER Light Source 1 sends obtains the collimated laser light light beam after through collimating apparatus 2; The collimated laser light light beam converts collimation bandlet light beam into through slit diaphragm 3 again; Air-breathing pump or fan aspirates air to be measured, and the air current flow direction of air to be measured and collimation bandlet light beam wide is perpendicular, as shown in Figure 1; The air-flow of air to be measured and the collimation bandlet light beam formation light sensitive area that intersects; The light sensitive area zone that to be exactly collimation bandlet light beam irradiates produce scattered light to the airborne particulate to be measured, the main shaft of concave surface completely reflecting mirror 4 passes light sensitive area, and perpendicular with the direction of illumination of the airflow direction of air to be measured and collimation bandlet light beam; What concave surface completely reflecting mirror 4 received is the scattered light that gets into the particulate of light sensitive area; It converges scattered light and reflex on the light signal collection plate 5, and light signal collection plate 5 converts the light signal of gathering into electric signal and send subsequent conditioning circuit to handle, analyze the size that can obtain particulate in the tested air, is converted to the quality of particulate in the tested air again through specific quality coefficient; Collimation bandlet light beam gets into delustring trap 6 after passing light sensitive area, is absorbed by delustring trap 6.
are provided with the layer of protecting air-flow in order to protect light source 1 in the sensor, concave surface completely reflecting mirror 4 etc. not contaminated in the periphery of air to be measured.
Claims (1)
1. an air finely ground particles monitoring instrument is characterized in that: comprise
LASER Light Source;
The collimating apparatus of the laser beam of can the said LASER Light Source of collimation launching;
Can the laser beam behind said collimating device collimation be changed into the slit diaphragm of collimation bandlet light beam;
Can aspirate air to be measured and make the air-flow of this air to be measured along passing the air-breathing pump or fan of this collimation bandlet light beam with wide perpendicular direction of said collimation bandlet light beam;
The light signal collection plate;
Can the scattered beam that said airborne finely ground particles to be measured forms after by said collimation bandlet light beam irradiates be converged and reflex to the concave mirror on the said light signal collection plate; Said light signal collection plate is positioned at the along on the main shaft of said concave mirror; The main shaft of said concave mirror is all perpendicular with the direction of illumination of the air current flow direction of said air to be measured, said collimation bandlet light beam, and the main shaft of said concave mirror passes the air-flow of said air to be measured and the zone that said collimation bandlet light beam intersects;
Be positioned at the relative side of said LASER Light Source and can eliminate the delustring trap that absorbs said collimation bandlet light beam;
When said monitoring instrument was monitored airborne finely ground particles to be measured, the periphery of said air to be measured was provided with the protection air-flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101959825A CN102692366A (en) | 2012-06-14 | 2012-06-14 | Instrument for monitoring microparticles in air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012101959825A CN102692366A (en) | 2012-06-14 | 2012-06-14 | Instrument for monitoring microparticles in air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102692366A true CN102692366A (en) | 2012-09-26 |
Family
ID=46857965
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012101959825A Pending CN102692366A (en) | 2012-06-14 | 2012-06-14 | Instrument for monitoring microparticles in air |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063555A (en) * | 2012-12-31 | 2013-04-24 | 战仁军 | Smoke particle measuring system |
| CN104422638A (en) * | 2013-08-20 | 2015-03-18 | 夏普株式会社 | Device and method for detecting concentration of micro-particulate matter in air sample |
| CN109752301A (en) * | 2019-03-05 | 2019-05-14 | 北京英视睿达科技有限公司 | The measuring device and check and correction factor determination method of total suspended particles concentration |
| CN112014284A (en) * | 2020-08-27 | 2020-12-01 | 苏州亿利安机电科技有限公司 | Direct-reading dust concentration measuring instrument |
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| CN2216679Y (en) * | 1994-10-28 | 1996-01-03 | 苏州净化设备厂 | Electro-optical sensor of counter for dust particle |
| CN2366845Y (en) * | 1999-02-08 | 2000-03-01 | 中国科学院上海光学精密机械研究所 | High performance optical probe of white light dust particle counter |
| US20030223062A1 (en) * | 2002-05-28 | 2003-12-04 | Rion Co., Ltd. | Particle detector |
| CN1554962A (en) * | 2003-12-27 | 2004-12-15 | 大连理工大学 | Optical lens protective device |
| CN101162194A (en) * | 2007-11-16 | 2008-04-16 | 苏州华达仪器设备有限公司 | Optical senser of measurement dust particle |
| CN101793669A (en) * | 2010-02-09 | 2010-08-04 | 南京理工大学 | Optical sensor of novel high-output all-semiconductor dust particle counter |
| CN202869924U (en) * | 2012-06-14 | 2013-04-10 | 苏州苏净仪器自控设备有限公司 | Apparatus for monitoring fine particulates in air |
-
2012
- 2012-06-14 CN CN2012101959825A patent/CN102692366A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2216679Y (en) * | 1994-10-28 | 1996-01-03 | 苏州净化设备厂 | Electro-optical sensor of counter for dust particle |
| CN2366845Y (en) * | 1999-02-08 | 2000-03-01 | 中国科学院上海光学精密机械研究所 | High performance optical probe of white light dust particle counter |
| US20030223062A1 (en) * | 2002-05-28 | 2003-12-04 | Rion Co., Ltd. | Particle detector |
| CN1554962A (en) * | 2003-12-27 | 2004-12-15 | 大连理工大学 | Optical lens protective device |
| CN101162194A (en) * | 2007-11-16 | 2008-04-16 | 苏州华达仪器设备有限公司 | Optical senser of measurement dust particle |
| CN101793669A (en) * | 2010-02-09 | 2010-08-04 | 南京理工大学 | Optical sensor of novel high-output all-semiconductor dust particle counter |
| CN202869924U (en) * | 2012-06-14 | 2013-04-10 | 苏州苏净仪器自控设备有限公司 | Apparatus for monitoring fine particulates in air |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103063555A (en) * | 2012-12-31 | 2013-04-24 | 战仁军 | Smoke particle measuring system |
| CN104422638A (en) * | 2013-08-20 | 2015-03-18 | 夏普株式会社 | Device and method for detecting concentration of micro-particulate matter in air sample |
| CN109752301A (en) * | 2019-03-05 | 2019-05-14 | 北京英视睿达科技有限公司 | The measuring device and check and correction factor determination method of total suspended particles concentration |
| CN112014284A (en) * | 2020-08-27 | 2020-12-01 | 苏州亿利安机电科技有限公司 | Direct-reading dust concentration measuring instrument |
| CN112014284B (en) * | 2020-08-27 | 2023-11-24 | 苏州亿利安机电科技有限公司 | Direct-reading dust concentration measuring instrument |
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Application publication date: 20120926 |