CN103575626A - Particulate matter (PM) 2.5 detection device based on wide-angle Fourier transformation - Google Patents
Particulate matter (PM) 2.5 detection device based on wide-angle Fourier transformation Download PDFInfo
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- CN103575626A CN103575626A CN201310519249.9A CN201310519249A CN103575626A CN 103575626 A CN103575626 A CN 103575626A CN 201310519249 A CN201310519249 A CN 201310519249A CN 103575626 A CN103575626 A CN 103575626A
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Abstract
The invention relates to a particulate matter (PM) 2.5 detection device based on wide-angle Fourier transformation. The PM2.5 detection device comprises a laser, a collimator, a negative pressure generation unit, a transparent pipe, a pipe socket, a complex variable lens, a camera and a processor, wherein the collimator is arranged in a laser output axis of the laser and is used for collimating laser output from the laser into a light beam with the needed diameter; the complex variable lens is arranged in the laser output axis; the laser output axis is overlapped with an optical axis of the complex variable lens; the transparent pipe is arranged on a front focal plane of the complex variable lens; one end of the transparent pipe is provided with the pipe socket, and the other end of the transparent pipe is connected with the negative pressure generation unit; the negative pressure generation unit generates negative pressure to compress micron particulate matters in the direction of the pipe socket into the transparent pipe; a diffraction screen is arranged on a rear focal plane of the complex variable lens, is parallel to the transparent pipe and is perpendicular to the optical axis. The PM2.5 detection device can be used for conveniently detecting PM2.5.
Description
Technical field
The present invention relates to a kind of particle diameter detection method, particularly the PM2.5 pick-up unit based on wide-angle Fourier transform.
Background technology
PM2.5 claims again particulate, fine grained.PM2.5: refer to that aerodynamics equivalent diameter in surrounding air is less than or equal to the particle of 2.5 μ m (micron), also claims fine particle.This value is higher, just represents that air pollution is more serious.Pellet is called again PM10, refers to that aerodynamics equivalent diameter is at the particle below 10 microns.
Although fine particle is content component seldom in earth atmosphere composition, it has important impact to air quality and visibility etc.Fine particle particle diameter is little, contains a large amount of poisonous and harmful substances and the residence time in atmosphere is long, fed distance is far away, thereby larger on the impact of health and atmosphere quality.
Fine particle (Particulate) general reference is suspended in micro-solid or the liquid in the middle of gas.Pellet in urban air-quality daily paper or weekly and overall suspended pellet are two kinds of atmosphere pollutions that people are comparatively familiar with.Pellet is called again PM10, refers to that diameter is equal to or less than 10 microns, can enter the particle of people's respiratory system; Overall suspended pellet is also referred to as PM100, and diameter is less than and equals the particle of 100 microns.
In the middle of be less than the suspended particles of 10 micron diameters, be defined as respirable suspended particulate, they can accumulate in lung, harm humans is healthy.The particle that diameter is less than 2.5 microns, maximum to harm, because it can directly enter alveolar.Scientist represents the content of this particle in every cubic metres of air with PM2.5, this value is higher, just represents that air pollution is more serious.
The instrument of light scattering method is external, domestic manufacturer is more.Divide again normal optical scattering, and laser light scattering method.Because the repeatability of laser light scattering method instrument, good stability, at American-European-Japanese normal optical scattering method that replaced comprehensively.But the instrument quality difference of domestic laser method is larger, answer the secure factory of attentional selection quality.
Summary of the invention
The object of this invention is to provide a kind of PM2.5 pick-up unit based on wide-angle Fourier transform, to facilitate, detect fine grained PM2.5.
The object of the present invention is achieved like this, PM2.5 pick-up unit based on wide-angle Fourier transform, it is characterized in that: it comprises: laser instrument, collimating apparatus, negative pressure generation unit, transparent pipe, hydraucone, become again lens, video camera, processor, collimating apparatus is on laser device laser output axis, collimating apparatus is collimated into by laser device laser output the beam diameter needing, on Laser output axis, there are multiple change lens, Laser output axis with become again lens axis and overlap, become again lens front focal plane and have transparent pipe, transparent pipe one end is hydraucone, the other end is connected with negative pressure generation unit, negative pressure generation unit produces negative pressure, make the micron particles thing compression of hydraucone direction enter transparent pipe, the back focal plane that becomes again lens has diffraction screen, and diffraction screen is parallel with transparent pipe, vertical with optical axis.
Described laser instrument adopts 6328HN laser instrument.
Described multiple change lens adopt diameter 50-100mm, and the thin lens of focal length between 300-500mm, to obtain the Fourier transform diffraction pattern of wide-angle PM2.5.
Described transparent pipe adopts square light wall pipe.
Advantage of the present invention is: the present invention is collimated into laser instrument by collimating apparatus the beam diameter needing, be radiated on the micron particles thing in transparent pipe, micron particles thing passes through Ear Mucosa Treated by He Ne Laser Irradiation, back focal plane at multiple change lens forms shallow bid diffraction, there is diffraction screen at shallow bid diffraction place, after shallow bid diffraction, on diffraction screen, form light and dark concentric circles, concentrically ringed size is with to become again lens relevant, also relevant with micron particles thing size, after the multiple change focal length of lens is determined, concentric circles size changes with micron particles thing variation face, by video camera, obtain concentric circle diagram picture, by the processor being connected with video camera, image is processed, then obtain micron particles thing sizes values.
Accompanying drawing explanation
Below in conjunction with embodiment, the invention will be further described:
Fig. 1 is embodiment of the present invention structural representation.
Fig. 2 is PM2.5 diffraction power spectrum chart.
In figure, 1, laser instrument; 2, collimating apparatus; 3, negative pressure generation unit; 4, transparent pipe; 5, micron particles thing; 6, hydraucone; 7, become again lens; 8, diffraction screen; 9, video camera; 10, processor.
Embodiment
Embodiment
As shown in Figure 1, PM2.5 pick-up unit based on wide-angle Fourier transform, it comprises: laser instrument 1, collimating apparatus 2, negative pressure generation unit 3, transparent pipe 4, hydraucone 6, become again lens 7, video camera 9, processor 10, collimating apparatus 2 is on laser instrument 1 Laser output axis, collimating apparatus 2 is collimated into laser instrument 1 Laser output the beam diameter needing, on Laser output axis, there are multiple change lens 7, Laser output axis with become again lens 7 optical axis coincidences, become again lens 7 front focal planes and have transparent pipe 4, transparent pipe 4 one end are hydraucone 6, the other end is connected with negative pressure generation unit 3, negative pressure generation unit 3 produces negative pressure, make micron particles thing 5 compressions of hydraucone 6 directions enter transparent pipe 4, the back focal plane that becomes again lens 7 has diffraction screen 8, and diffraction screen 8 is parallel with transparent pipe 4, vertical with optical axis.
During work, the light beam of laser instrument 1 is after collimating apparatus 2, by collimating apparatus 2, laser instrument 1 is collimated into the beam diameter needing, be radiated on the micron particles thing 5 in transparent pipe 4, micron particles thing 5 passes through Ear Mucosa Treated by He Ne Laser Irradiation, back focal plane at multiple change lens 7 forms shallow bid diffraction, there is diffraction screen 8 at shallow bid diffraction place, after shallow bid diffraction, on diffraction screen 8, form light and dark concentric circles, concentrically ringed size is with to become again lens 7 relevant, also relevant with micron particles thing 5 sizes, after multiple change lens 7 focal lengths are determined, concentric circles size changes with micron particles thing 5 variation faces, by video camera 9, obtain concentric circle diagram picture, by the processor being connected with video camera 9, image is processed, then obtain micron particles thing 5 sizes values.
Laser instrument 1 adopts 6328HN laser instrument.
As shown in Figure 2, because micron particles thing 5 is very little, become again lens 7 and adopt diameter 50-100mm, the thin lens of focal length between 300-500mm, to obtain the Fourier transform diffraction pattern of wide-angle PM2.5, namely first order diffraction pattern.
Transparent pipe 4 adopts square light wall pipe, and square tube bore is less than the more than ten times of hydraucone 6, can collect the micron particles thing 5 of more concentration at square light wall pipe, makes diffracting effect remarkable, measures easily.
Negative pressure generation unit 3 is blower fans of an air volume controlled, by controlling rotation speed of fan, obtains the negative pressure of needs, makes micron particles thing 5 enter hydraucone 6.
The parts that the present embodiment does not describe in detail and structure belong to well-known components and common structure or the conventional means of the industry, here not narration one by one.
Claims (4)
1. the PM2.5 pick-up unit based on wide-angle Fourier transform, it is characterized in that: it comprises: laser instrument (1), collimating apparatus (2), negative pressure generation unit (3), transparent pipe (4), hydraucone (6), become again lens (7), video camera (9), processor (10), collimating apparatus (2) is on laser instrument (1) Laser output axis, collimating apparatus (2) is collimated into laser instrument (1) Laser output the beam diameter needing, on Laser output axis, there are multiple change lens (7), Laser output axis with become again lens (7) optical axis coincidence, become again lens (7) front focal plane and have transparent pipe (4), transparent pipe (4) one end is hydraucone (6), the other end is connected with negative pressure generation unit (3), negative pressure generation unit (3) produces negative pressure, make micron particles thing (5) compression of hydraucone (6) direction enter transparent pipe (4), the back focal plane that becomes again lens (7) has diffraction screen (8), and diffraction screen (8) is parallel with transparent pipe (4), vertical with optical axis.
2. the PM2.5 pick-up unit based on wide-angle Fourier transform according to claim 1, is characterized in that: described laser instrument (1) adopts 6328HN laser instrument.
3. the PM2.5 pick-up unit based on wide-angle Fourier transform according to claim 1, it is characterized in that: described multiple change lens (7) adopt diameter 50-100mm, the thin lens of focal length between 300-500mm, to obtain the Fourier transform diffraction pattern of wide-angle PM2.5.
4. the PM2.5 pick-up unit based on wide-angle Fourier transform according to claim 1, is characterized in that: described transparent pipe (4) adopts square light wall pipe.
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| CN201310519249.9A CN103575626B (en) | 2013-10-29 | 2013-10-29 | PM2.5 based on Radix Rumicis Fourier transformation detects device |
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| CN201310519249.9A CN103575626B (en) | 2013-10-29 | 2013-10-29 | PM2.5 based on Radix Rumicis Fourier transformation detects device |
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| CN103575626A true CN103575626A (en) | 2014-02-12 |
| CN103575626B CN103575626B (en) | 2016-09-28 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108593504A (en) * | 2017-12-26 | 2018-09-28 | 中国人民解放军第四军医大学 | A kind of device design method of detectable PM2.5 size and shapes |
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| CN108593504A (en) * | 2017-12-26 | 2018-09-28 | 中国人民解放军第四军医大学 | A kind of device design method of detectable PM2.5 size and shapes |
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