CN209878547U - Atmospheric particulate detection device - Google Patents
Atmospheric particulate detection device Download PDFInfo
- Publication number
- CN209878547U CN209878547U CN201822260037.4U CN201822260037U CN209878547U CN 209878547 U CN209878547 U CN 209878547U CN 201822260037 U CN201822260037 U CN 201822260037U CN 209878547 U CN209878547 U CN 209878547U
- Authority
- CN
- China
- Prior art keywords
- detection
- detection unit
- point
- particles
- pulse laser
- 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 - Fee Related
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 165
- 239000013618 particulate matter Substances 0.000 claims abstract description 30
- 239000002245 particle Substances 0.000 claims description 32
- 238000001228 spectrum Methods 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 5
- 239000007789 gas Substances 0.000 abstract description 13
- 239000000203 mixture Substances 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 4
- 239000000443 aerosol Substances 0.000 description 3
- 239000012528 membrane Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000004949 mass spectrometry Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003947 neutron activation analysis Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
- 238000004846 x-ray emission Methods 0.000 description 1
Landscapes
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The utility model discloses an atmospheric particulates detection device, including detection space, suction nozzle, play gas nozzle, first check point, second check point, be used for detecting the particulate matter concentration of first check point and the first detecting element of diameter are used for detecting the second detecting element of the particulate matter composition of second check point, and connect first detecting element with the photoelectric detection circuit of second detecting element, because the utility model discloses a particulate matter concentration, diameter in the gas of first check point are detected to first detecting element, detect the particulate matter composition in these some gases once more through the second detecting element when the gas of first check point moves to the second check point along with the air current.
Description
Technical Field
The utility model relates to a gaseous detection area, especially a detection device for be arranged in measuring concentration, diameter and the composition of particulate matter in the atmosphere.
Background
Particulate matter (PM 2.5, PM 10) pollution is one of the leading factors in atmospheric environmental pollution. Currently, the degree of particulate contamination is described in terms of the concentration of particulate matter. However, different particles are not harmful to human body. For example, the same concentration of sand dust and heavy metal-containing aerosol particles can be quite different. With the further deepening of the prevention and control of the atmospheric pollution, the single particle concentration information can not meet the requirement of environmental improvement. An atmospheric particulate component detection system can measure a component of the particulate matter. On the one hand, the harm degree of the particulate matters can be more accurately calculated through the components of the particulate matters. On the other hand, the source of the particulate matter can be determined. Provides more scientific basis for air quality control.
The atmospheric particulate component detection is carried out by collecting particulate matters on a filter membrane through a particulate matter sampler and taking the particulate matters back to a laboratory, and then carrying out off-line analysis by using a laboratory instrument. This method has a long detection period and very limited detection capability. Later, some companies have concentrated particulate matter on a filter membrane in an automatic online manner, and then detected the particulate matter by using the principles of X-ray fluorescence spectrometry, neutron activation analysis, and the like. Such methods have low detection accuracy, present a radiological risk, and are unable to detect the components of a single particulate. The single-particle aerosol mass spectrometer is a method utilizing mass spectrometry and can detect components of single particles. However, the single-particle aerosol mass spectrometer has a complex structure and a heavy volume, and is not suitable for field detection.
Disclosure of Invention
The utility model aims at providing a can detect detection device of concentration, diameter and composition of particulate matter in the atmosphere.
In order to achieve the above purpose, the utility model adopts the technical scheme that:
an atmospheric particulate detection device comprises a detection space, an air inlet nozzle positioned at one end part of the detection space, an air outlet nozzle positioned at the other end part of the detection space, a first detection point arranged in the detection space and close to the air inlet nozzle, a second detection point arranged in the detection space and close to the air inlet nozzle, and a first detection unit used for detecting the particulate concentration and the diameter of the first detection point, a second detection unit for detecting the particulate matter component at the second detection point, and a photoelectric detection circuit connecting the first detection unit and the second detection unit, the photoelectric detection circuit calculates the time T required by the particles to move from the first detection point to the second detection point according to the airflow speed in the detection space, the second detection unit detects after the time T at which the first detection unit detects the particulate matter.
Preferably, the first detection unit includes a first light source, a first condensing lens group that condenses detection light emitted from the first light source to the first detection point, a first detection lens group that collects scattered light of the first detection point, and a photodetector.
Further preferably, the first light source is a laser of continuous optical power.
Further preferably, the particle is irradiated by a detection light when passing through the first detection point, the particle blocks the detection light and generates a scattered light, and the first focusing lens group focuses the scattered light on the photodetector, so that the photodetector generates a pulse signal having a pulse amplitude proportional to the diameter of the particle.
Further preferably, the photoelectric detection circuit sends a detection signal to the second detection unit after receiving the pulse signal, and the second detection unit starts detection after delaying the time T after receiving the detection signal.
Preferably, the second detection unit includes a second light source, a second converging lens group that converges detection light emitted from the second light source to the second detection point, a second detection lens group that collects a radiation spectrum passing through the second detection point, and a spectrometer.
Further preferably, the second light source includes a pulse laser and a pulse laser trigger for triggering the pulse laser to emit pulse laser, and the photoelectric detection circuit controls the pulse laser to emit pulse laser through the pulse laser trigger after the time T detected by the first detection unit.
Further preferably, the number of the pulse lasers is at least two, and the photoelectric detection circuit adjusts the number of the emitted light of the pulse lasers according to the diameter of the particulate matter detected by the first detection unit.
Further preferably, the amount of light emitted by the pulse laser is proportional to the diameter of the particulate matter detected by the first detection unit.
The atmospheric particulate detection method is used for detecting the concentration, the diameter and the components of atmospheric particulates.
Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
because the utility model discloses a particulate matter concentration, diameter in the gas of first check point are detected to first check point by first detecting element, move the particulate matter composition in these some gases through the second detecting element when the gas of first check point moves to the second check point along with the air current once more.
Drawings
Fig. 1 is a schematic diagram of the present invention.
In the above drawings: 1. detecting a space; 11. an air inlet nozzle; 12. an air outlet nozzle; 21. a first detection point; 22. a second detection point; 3. a photoelectric detection circuit; 41. a continuous optical power laser; 42. a first converging lens group; 43. a first detection lens group; 44. a photodetector; 51. a pulsed laser; 52. a pulse laser trigger; 53. a second converging lens group; 54. a second detection lens group; 55. a spectrometer.
Detailed Description
The invention will be further described with reference to the embodiments shown in the drawings to which:
referring to fig. 1, the atmospheric particulate detection device comprises a detection space 1, an air inlet nozzle 11 positioned at one end of the detection space 1, an air outlet nozzle 12 positioned at the other end of the detection space 1, a first detection point 21 arranged in the detection space 1 and close to the air inlet nozzle 11, a second detection point 22 arranged in the detection space 1 and close to the air inlet nozzle, a first detection unit for detecting the particulate concentration and diameter of the first detection point 21, a second detection unit for detecting the particulate component of the second detection point 22, and a photoelectric detection circuit 3 connecting the first detection unit and the second detection unit. The photoelectric detection circuit 3 calculates the time T required for the particles to move from the first detection point 21 to the second detection point 22 according to the air flow velocity in the detection space 1, and controls the second detection unit to perform detection after the time T detected by the first detection point 21. At this time, the particulate matter in the gas detected by the second detection unit is the particulate matter in the gas at the first detection position before the time T. From this, the concentration, diameter and composition of the particulate matter can be determined.
The first detection unit includes a continuous optical power laser 41, a first converging lens group 42, a first detection lens group 43, and a photodetector 44.
The continuous optical power laser emits laser, and the first converging lens group 42 converges the laser to the first detection point 21, so that a fine light spot is formed at the first detection point 21. Particulate matters in the atmosphere enter the detection space 1 through the air inlet nozzle 11, scattered light is generated by irradiation of a fine light spot, the scattered light is converged to the photoelectric detector 44 through the first detection lens group 43 to generate a weak current signal, the photoelectric detection circuit 3 amplifies and processes the weak current signal to form a corresponding pulse signal, and the amplitude H of the signal is proportional to the size d of the particulate matters. The size d of the particles passing through the detection zone can be measured from the amplitude H of the pulse signal. From the number of pulse signals, the amount of particulate matter passing through the detection zone can be determined. Calculating the volume of the particles by using the particle size d of the particles:
v=(4/3)π(d/2)4，
the mass of the particles can be found by multiplying the volume v by the density ρ of the particles:
m=ρv，
the mass of all the particles passing through the detection region is added to obtain the total mass M = Σ M of the particles passing through the detection region. Assuming that the gas flowing into the gas inlet nozzle 11 per unit time is l, the detection time is t. The concentration of particulate matter in the atmosphere is then:
N=M/（lt）。
the second detection unit comprises two pulse lasers 51, a pulse laser trigger 52, a second converging lens group 53, a second detection lens group 54 and a spectrometer 55, and the photoelectric detection circuit 3 is connected with the photoelectric detector 44 and the pulse laser trigger 52.
When the particles in a gas are detected by the first detection unit at the first detection point 21, the photodetector 44 sends a light trigger signal to the pulse laser trigger 52 after receiving the weak current signal sent by the photodetector 44, the pulse laser trigger 52 triggers the pulse laser 51 to send high-energy pulse laser after receiving the light trigger signal by a delay time T, and the high-energy pulse laser is converged to the second detection point 22 through the second converging lens group 53.
And the particles in the gas detected by the first detection unit move to the second detection point 22 after the time T, at this time, the particles converged on the particles by the high-energy pulse laser are excited and ionized under the irradiation of the high-energy pulse laser to generate a radiation spectrum, the radiation spectrum is converged to the spectrometer 55 by the second detection converging lens, and the spectrometer 55 reads out a spectrum signal to calculate the radiation spectrum wavelength of the particles. And solving corresponding elements according to the wavelength of the radiation spectrum, thereby measuring the element components contained in the particles.
In addition, in the present embodiment, the photodetection circuit 3 controls the two pulse lasers 51 to emit high-energy pulse laser light according to the amplitude H of the pulse signal scattered by the particulate matter detected by the first detection unit, and when the amplitude H of the pulse signal generated by the particulate matter is greater than or equal to the set value Hp, triggers the two pulse lasers 51 to emit light at the same time; when the amplitude H of the pulse signal generated by the particulate matter is smaller than the set value Hp, only one pulse laser 51 is triggered to emit light. Thereby improving the accuracy of the detection.
Therefore, the invention can be used for obtaining the statistical information of the concentration of the particulate matters in the atmosphere, the components of the single particulate matters and the components of the particulate matters with different sizes.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.
Claims (9)
1. The utility model provides an atmospheric particulates detection device which characterized in that: comprises a detection space, an air inlet nozzle positioned at one end part of the detection space, an air outlet nozzle positioned at the other end part of the detection space, a first detection point arranged in the detection space and close to the air inlet nozzle, a second detection point arranged in the detection space and close to the air inlet nozzle, and a first detection unit used for detecting the concentration and the diameter of particles at the first detection point, a second detection unit for detecting the particulate matter component at the second detection point, and a photoelectric detection circuit connecting the first detection unit and the second detection unit, the photoelectric detection circuit calculates the time T required by the particles to move from the first detection point to the second detection point according to the airflow speed in the detection space, the second detection unit detects after the time T at which the first detection unit detects the particulate matter.
2. The atmospheric particulate detection device according to claim 1, characterized in that: the first detection unit comprises a first light source, a first converging lens group for converging detection light emitted by the first light source to the first detection point, a first detection lens group for collecting scattered light of the first detection point and a photoelectric detector.
3. The atmospheric particulate detection device according to claim 2, characterized in that: the first light source is a laser of continuous optical power.
4. The atmospheric particulate detection device according to claim 2, characterized in that: when the particles pass through the first detection point, the particles are irradiated by detection light, the particles block the detection light and generate scattered light, and the first converging lens group converges the scattered light to the photoelectric detector, so that the photoelectric detector generates a pulse signal with pulse amplitude in direct proportion to the diameter of the particles.
5. The atmospheric particulate detection device according to claim 4, characterized in that: and the photoelectric detection circuit sends a detection signal to the second detection unit after receiving the pulse signal, and the second detection unit starts detection after delaying the time T after receiving the detection signal.
6. The atmospheric particulate detection device according to claim 1, characterized in that: the second detection unit comprises a second light source, a second converging lens group for converging detection light emitted by the second light source to the second detection point, a second detection lens group for collecting radiation spectrum passing through the second detection point and a spectrometer.
7. The atmospheric particulate detection device according to claim 6, characterized in that: the second light source comprises a pulse laser and a pulse laser trigger for triggering the pulse laser to emit pulse laser, and the photoelectric detection circuit controls the pulse laser to emit the pulse laser through the pulse laser trigger after the time T detected by the first detection unit.
8. The atmospheric particulate detection device according to claim 7, characterized in that: the pulse lasers are at least two, and the photoelectric detection circuit adjusts the number of the light emitted by the pulse lasers through the diameter of the particles detected by the first detection unit.
9. The atmospheric particulate detection device according to claim 8, characterized in that: the quantity of the light emitted by the pulse laser is in direct proportion to the diameter of the particulate matter detected by the first detection unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822260037.4U CN209878547U (en) | 2018-12-30 | 2018-12-30 | Atmospheric particulate detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822260037.4U CN209878547U (en) | 2018-12-30 | 2018-12-30 | Atmospheric particulate detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209878547U true CN209878547U (en) | 2019-12-31 |
Family
ID=68950163
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822260037.4U Expired - Fee Related CN209878547U (en) | 2018-12-30 | 2018-12-30 | Atmospheric particulate detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209878547U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632589A (en) * | 2018-12-30 | 2019-04-16 | 江苏苏净集团有限公司 | A kind of Atmospheric particulates detection device and method |
| CN111855544A (en) * | 2020-07-31 | 2020-10-30 | 洹仪科技(上海)有限公司 | Fluorescence imaging device and imaging method thereof |
| CN112504922A (en) * | 2020-10-20 | 2021-03-16 | 华南师范大学 | Online measurement system and method for particle size distribution of atmospheric particulates |
-
2018
- 2018-12-30 CN CN201822260037.4U patent/CN209878547U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109632589A (en) * | 2018-12-30 | 2019-04-16 | 江苏苏净集团有限公司 | A kind of Atmospheric particulates detection device and method |
| CN109632589B (en) * | 2018-12-30 | 2024-03-12 | 江苏苏净集团有限公司 | Atmospheric particulate detection device and method |
| CN111855544A (en) * | 2020-07-31 | 2020-10-30 | 洹仪科技(上海)有限公司 | Fluorescence imaging device and imaging method thereof |
| CN112504922A (en) * | 2020-10-20 | 2021-03-16 | 华南师范大学 | Online measurement system and method for particle size distribution of atmospheric particulates |
| CN112504922B (en) * | 2020-10-20 | 2022-09-02 | 华南师范大学 | Online measurement system and method for particle size distribution of atmospheric particulates |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109632589B (en) | Atmospheric particulate detection device and method | |
| CN205958420U (en) | Light scattering particulate matter concentration detection device | |
| CN209878547U (en) | Atmospheric particulate detection device | |
| US7932490B2 (en) | Size segregated aerosol mass concentration measurement device | |
| EP3183555B1 (en) | Devices, systems and methods for detecting particles | |
| US8009290B2 (en) | Compact, low cost particle sensor | |
| CN103018145A (en) | Novel real-time PM2.5 (particulate matter 2.5) mass concentration monitoring device and monitoring method | |
| CN110132802B (en) | Online detection device and online detection method for particle size and particle concentration | |
| US20110116090A1 (en) | System and method for real time determination of size and chemical composition of aerosol particles | |
| JPS6311838A (en) | Granular size detector | |
| US11768148B2 (en) | Miniaturized optical particle detector | |
| CN101149326A (en) | Vacuum ultraviolet ionized aerosol mass spectrometer | |
| Macias et al. | Atmospheric particulate mass measurement with beta attenuation mass monitor | |
| JP2012509486A (en) | Method and system for analyzing solid particles in a medium | |
| CN102841076B (en) | Spectrometer apparatus using continuous wave laser and photomultiplier tube | |
| CN209416865U (en) | A kind of oil liquid Particulate Pollution detection device | |
| CN202869934U (en) | Novel real-time monitoring device for mass concentration of PM2.5 | |
| CN106053303A (en) | Laser forward scattering cloud droplet spectrum detection system | |
| JPH08159949A (en) | Particle detection device | |
| JP6686558B2 (en) | Particle analyzer and particle analysis method | |
| CN113720735A (en) | Portable aerosol particle size spectrometer and measurement method thereof | |
| CN109632588B (en) | Device and method for detecting pollution of oil particulate matters | |
| CN102692366A (en) | Instrument for monitoring microparticles in air | |
| JP2007309895A (en) | Particle analyzer | |
| Suda | Instrumentation for the size determination of submicron particulates systems by sideway light scattering method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20191231 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |