CN202869924U - Apparatus for monitoring fine particulates in air - Google Patents
Apparatus for monitoring fine particulates in air Download PDFInfo
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- CN202869924U CN202869924U CN 201220278327 CN201220278327U CN202869924U CN 202869924 U CN202869924 U CN 202869924U CN 201220278327 CN201220278327 CN 201220278327 CN 201220278327 U CN201220278327 U CN 201220278327U CN 202869924 U CN202869924 U CN 202869924U
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Abstract
The utility model discloses an apparatus for monitoring fine particulates in air. The apparatus comprises a laser light source, a collimator, a slit diaphragm, a light signal acquisition plate and a concave surface totally-reflecting mirror, wherein the slit diaphragm can convert a laser light beam collimated by the collimator into a collimation flat belt beam; the light signal acquisition plate is positioned at a focal point on a main axis of the concave surface totally-reflecting mirror; a main axis of the concave surface totally-reflecting mirror penetrates through a zone in which the current of the air to be detected and the collimation flat belt beam are converged; a laser beam generated by the laser light source is collimated by the collimator and is converted into the collimation flat belt beam by the slit diaphragm; the collimation flat belt beam is irradiated to the particulate in the air to be detected to generate scattering light; the scattering light is converged by the concave surface totally-reflecting mirror and reflected to the light signal acquisition plate; the diameters of the particulates in the air to be detected are judged according to the size of light signals acquired by the light signal acquisition plate; and the quality of the particulates is acquired by specific quality coefficient conversion. By using the collimation flat belt beam, the time for allowing the particulates to pass through the light beam is shortened to avoid the superposition of the particulates, and the signal to noise ratio of the signals is improved.
Description
Technical field
The utility model relates to a kind of optical instrument, is specifically related to a kind of air finely ground particles monitoring instrument.
Background technology
It is the main cause that causes haze weather that the particulates thing pollutes, and particularly PM2.5(is less than or equal to 2.5 micron particles things) pellet can impact the health of human body, mainly respiratory system and cardiovascular system are damaged.And the less harm to human body of particle diameter is larger.The monitoring of air finely ground particles is significant to administering environment and to protect mankind health.
The method of present domestic measurement air finely ground particles mainly contains: (1) filter membrane weight method, and this Method And Principle is simple, and dust proof rate is high, and measurement result is reliable, but need to manually weigh, and complex operation, time-consuming can not be realized automatic measurement; (2) β attenuation sensors, the method measuring system reliable operation, but discontinuous measurement, also but Automatic continuous is measured, but there is potential safety hazard in the method, requires the in-site measurement personnel to have higher quality, and system also needs to increase various shielding measures, the complicated structure of equipment generally is applicable to the occasion of special measurement requirement; (3) micro-oscillating balance method, the method are measured the particle of different-grain diameter scope by joining different cutters, measuring accuracy is high, and real-time is good, and for PM2.5, this method needs the higher accessory kit of precision, and measurement is subjected to the impact of temperature, humidity larger; (4) light scattering method, the 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 the technology 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 larger in the atmosphere, when adopting the light scattering method monitoring, particle and particle overlap easily, influence each other, and cause the signal to noise ratio (S/N ratio) of the signal that collects lower.
Summary of the invention
The purpose of this utility model provides a kind of instrument that utilizes light scattering to monitor air finely ground particles particulate character, particularly to particle diameter less than or equal to the particle (PM1) of 1 μ m, particle diameter less than or equal to 2.5 μ m (PM2.5), the particle diameter monitoring less than or equal to 10 μ m (PM10), this instrument utilizes slit diaphragm to change laser beam into long and narrow bandlet light beam, so that airborne finely ground particles to be measured is by the time decreased of bandlet light beam, it is overlapping to avoid that particle occurs, to improve the signal to noise ratio (S/N ratio) of the signal that gathers.
For achieving the above object, the technical solution adopted in the utility model is: air finely ground particles monitoring instrument and monitoring method comprise:
LASER Light Source;
Can collimate the collimating apparatus of the laser beam that described LASER Light Source launches;
Laser beam behind described collimating device collimation can be changed into the slit diaphragm of collimation bandlet light beam;
Can aspirate air to be measured and so that 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 of described collimation bandlet light beam perpendicular direction;
The light signal collection plate;
The scattered beam that described airborne finely ground particles to be measured forms after by described collimation bandlet light beam irradiates can be converged and reflexes to the concave mirror on the described light signal collection plate, described light signal collection plate is positioned at the focus place on the main shaft of described concave mirror, the main shaft of described concave mirror is all perpendicular with the direction of illumination of the air current flow direction of described air to be measured, described collimation bandlet light beam, and the main shaft of described concave mirror passes the air-flow of described air to be measured and the zone that described collimation bandlet light beam intersects;
Be positioned at the relative side of described LASER Light Source and can eliminate the delustring trap that absorbs described collimation bandlet light beam;
When described monitoring instrument is monitored airborne finely ground particles to be measured, the outer shielding gas flow that is arranged with of described air to be measured.
Because the utilization of technique scheme, the utility model compared with prior art has following advantages: in this air molecule monitoring instrument, change the laser beam behind collimating device collimation into collimation bandlet light beam by slit diaphragm, particulates thing time of passing light beam can reduce like this, thereby avoided the overlapping of particle, improved the signal to noise ratio (S/N ratio) of collection signal.
Description of drawings
Accompanying drawing 1 is synoptic diagram of the present utility model.
Embodiment
Further set forth structure of the present utility model below in conjunction with accompanying drawing.
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, be positioned at the light signal collection plate 5 at concave surface completely reflecting mirror 4 focus places, be positioned at the delustring trap 6 of the relative side of LASER Light Source, air-breathing pump or fan (not shown), the laser beam that the laser beam that LASER Light Source 1 is sent obtains collimating after by collimating apparatus 2, the laser beam of collimation is converted to collimation bandlet light beam by slit diaphragm 3 again, air-breathing pump or fan aspirates air to be measured, the air current flow direction of air to be measured is perpendicular with wide that collimates the bandlet light beam, 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 collimation bandlet light beam with the airflow direction of air to be measured, what concave surface completely reflecting mirror 4 received is the scattered light that enters the particulate of light sensitive area, it converges scattered light and reflex on the light signal collection plate 5, light signal collection plate 5 is converted to electric signal with the light signal that gathers and send subsequent conditioning circuit to process, analysis can obtain the particle size of particulate in the tested air, be converted to again the quality of particulate in the tested air by specific quality coefficient, enter delustring trap 6 after collimation bandlet light beam passes light sensitive area, absorbed by delustring trap 6.
In order to protect light source 1 in the sensor, concave surface completely reflecting mirror 4 etc. not contaminated, be provided with one deck shielding gas flow 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;
Can collimate the collimating apparatus of the laser beam that described LASER Light Source launches;
Laser beam behind described collimating device collimation can be changed into the slit diaphragm of collimation bandlet light beam;
Can aspirate air to be measured and so that 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 of described collimation bandlet light beam perpendicular direction;
The light signal collection plate;
The scattered beam that described airborne finely ground particles to be measured forms after by described collimation bandlet light beam irradiates can be converged and reflexes to the concave mirror on the described light signal collection plate, described light signal collection plate is positioned at the focus place on the main shaft of described concave mirror, the main shaft of described concave mirror is all perpendicular with the direction of illumination of the air current flow direction of described air to be measured, described collimation bandlet light beam, and the main shaft of described concave mirror passes the air-flow of described air to be measured and the zone that described collimation bandlet light beam intersects;
Be positioned at the relative side of described LASER Light Source and can eliminate the delustring trap that absorbs described collimation bandlet light beam;
When described monitoring instrument is monitored airborne finely ground particles to be measured, the outer shielding gas flow that is arranged with of described air to be measured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278327 CN202869924U (en) | 2012-06-14 | 2012-06-14 | Apparatus for monitoring fine particulates in air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220278327 CN202869924U (en) | 2012-06-14 | 2012-06-14 | Apparatus for monitoring fine particulates in air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202869924U true CN202869924U (en) | 2013-04-10 |
Family
ID=48036633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220278327 Expired - Lifetime CN202869924U (en) | 2012-06-14 | 2012-06-14 | Apparatus for monitoring fine particulates in air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202869924U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692366A (en) * | 2012-06-14 | 2012-09-26 | 苏州苏净仪器自控设备有限公司 | Instrument for monitoring microparticles in air |
| CN105092441A (en) * | 2014-05-14 | 2015-11-25 | 苏州元泰自动化科技有限公司 | Fine particle matter measuring device and measuring method |
-
2012
- 2012-06-14 CN CN 201220278327 patent/CN202869924U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102692366A (en) * | 2012-06-14 | 2012-09-26 | 苏州苏净仪器自控设备有限公司 | Instrument for monitoring microparticles in air |
| CN105092441A (en) * | 2014-05-14 | 2015-11-25 | 苏州元泰自动化科技有限公司 | Fine particle matter measuring device and measuring method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |