CN109520899A - A kind of air particle concentration detection method and device - Google Patents
A kind of air particle concentration detection method and device Download PDFInfo
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- CN109520899A CN109520899A CN201811431569.8A CN201811431569A CN109520899A CN 109520899 A CN109520899 A CN 109520899A CN 201811431569 A CN201811431569 A CN 201811431569A CN 109520899 A CN109520899 A CN 109520899A
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- particle concentration
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
- G01N15/075—Investigating concentration of particle suspensions by optical means
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Abstract
The invention discloses a kind of air particle concentration detection method and devices, provide a kind of air particle Concentration Testing algorithm using Nonlinear Quasi hop algorithm and the air particle concentration detection apparatus based on laser light scattering principle.In the space of specific particle concentration, the amplitude and quantity of the laser pulse for the particulate matter scattering that photodiode is received are as characteristic value, this feature value is compared with the particle concentration detected value of normal concentration detection device and is fitted to obtain the relation curve of the particle concentration of different-grain diameter and number of pulses, the particle concentration in unknown atmospheric environment can be calculated according to the curve.Technical solution of the present invention does not need the complicated calculations of Michaelis algorithm, has the characteristics that algorithm is quick, particulate matter detection range is wide, testing result consistency is good, has great practical value and market prospects.
Description
Technical field
The present invention relates to air particle detection technique field more particularly to a kind of air particle concentration detection method and
Device.
Background technique
Environmental protection and environmental quality have become the global key subjects of the mankind, and the important indicator for measuring air quality is
The concentration of PM2.5 particulate matter.Therefore, to PM2.5 in air, (PM2.5 refers to particle of the diameter less than or equal to 2.5um in air
Object) particle concentration detection with regard to extremely important.In the prior art, detection PM2.5 concentration is to utilize base based on light scattering principle
In the algorithm of Michaelis (MIE) theory, the particulate matter quantity of different-grain diameter in the equivalent grain size and unit volume of particulate matter is obtained, then
The particle concentration in unit volume air is calculated according to particle density.
Since Mie theory is based on Maxwell equation, it is related to seeking the infinite recursion of Bessel function and Hankel function
Be directed not only to largely calculate, have higher requirements to the single-chip microcontroller performance of PM2.5 sensor, otherwise sensor response speed
It is relatively slow, and since the particulate matter in different atmospheric environments has different classifications, and the density of different classes of particulate matter is different,
The accumulation and analysis of a large amount of empirical datas are needed, therefore is also difficult to obtain accurate, consistent particle concentration value.
Summary of the invention
For existing deficiencies in the technology, the present invention provides a kind of air particle concentration detection method and dress
It sets.
The present invention through the following technical solutions to achieve the above objectives:
A kind of air particle concentration detection apparatus, comprising: laser diode, photodiode, air duct, drawing fan,
Lens, MCU；
For the laser beam of the laser diode transmitting through lens focus at pencil, laser beam is irradiated to particle quality testing in air duct
It surveys in the air atom of room and scatters, the photodiode below particulate matter sensing chamber receives scattering light, and optical signal is turned
It is changed to electric signal input MCU.
As advanced optimizing, the air duct is to allow air to be able to maintain stable air-flow under the action of drawing fan
Flow through particulate matter sensing chamber.
As advanced optimizing, a kind of detection method of air particle concentration detection apparatus, the MCU acquires photoelectricity two
The impulse amplitude of pole pipe output, since the partial size of air particle is bigger, impulse amplitude is bigger, therefore in full range,
Amplitude is lower than a or the pulse higher than d is considered as noise or interference and removes；Pulse of the amplitude between a~b, which is considered as, to be detected
The optical signal that particulate matter of the partial size less than 1um scatters, corresponding PM1.0；Pulse of the amplitude between b~c is considered as the grain detected
The optical signal that particulate matter of the diameter less than 2.5um scatters, corresponding PM2.5；Pulse of the amplitude between c~d is considered as the grain detected
The optical signal that particulate matter of the diameter less than 10um scatters, corresponding PM10.
It, can in air when the particle concentration detection device works in real atmosphere environment as advanced optimizing
Can be mixed with that partial size is different and concentration also different particulate matter, MCU will collect arteries and veins corresponding with particulate matter scattering light
Amplitude and number of pulses are rushed, nonlinear fitting curve corresponding with a, b, c, d is inquired according to pulse height distribution, further according to non-thread
Property matched curve inquiry or calculate particle concentration value, then can be obtained by PM1.0, PM2.5 in atmospheric environment to be measured,
The particle concentrations such as PM10.
The beneficial effects of the present invention are:
Of the invention a kind of air particle concentration detection method and device provide and a kind of use Nonlinear Quasi hop algorithm
Air particle Concentration Testing algorithm and air particle concentration detection apparatus based on laser light scattering principle.In specific particle
In the space of object concentration, the amplitude and quantity of the laser pulse for the particulate matter scattering that photodiode is received are as feature
Value, this feature value is compared with the particle concentration detected value of normal concentration detection device and is fitted to obtain different-grain diameter
It is dense can to calculate the particulate matter in unknown atmospheric environment according to the curve for the relation curve of particle concentration and number of pulses
Degree.Technical solution of the present invention does not need the complicated calculations of Michaelis algorithm, have algorithm is quick, particulate matter detection range is wide,
The features such as testing result consistency is good has great practical value and market prospects.
Detailed description of the invention
It to describe the technical solutions in the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In required practical attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only the one of the present embodiment
A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these
Attached drawing obtains other attached drawings.
Fig. 1 is air particle concentration detection apparatus structural schematic diagram of the invention.
Fig. 2 is the particle size distribution schematic diagram of Nonlinear Quasi hop algorithm of the invention.
Fig. 3 is Nonlinear Quasi hop algorithm curve synoptic diagram of the invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, technical solution of the present invention will be carried out below
Detailed description.Obviously, the described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art without making creative work it is obtained it is all its
Its embodiment belongs to the range that the present invention is protected.
As shown in Figure 1, a kind of air particle concentration detection apparatus, comprising: laser diode 1, photodiode 3, wind
Road 4, drawing fan 6, lens 2, MCU5；
The laser beam that the laser diode 1 emits is focused into pencil through lens 2, and laser beam is irradiated to particle in air duct 4
It is scattered in the air atom of analyte detection room, the photodiode 3 below particulate matter sensing chamber receives scattering light, and light is believed
Number be converted to electric signal input MCU5.
As advanced optimizing, the air duct 4 is to allow air to be able to maintain stable gas under the action of drawing fan 6
Stream flows through particulate matter sensing chamber.
As shown in Fig. 2, a kind of detection method of air particle concentration detection apparatus, particle concentration inspection of the present invention
The impulse amplitude of the MCU acquisition photodiode output of device is surveyed, since the partial size of air particle is bigger, impulse amplitude is got over
Greatly, therefore in full scale (such as 00H~FFH) range, amplitude is lower than certain value (being denoted as a) or higher than the arteries and veins of certain value (being denoted as d)
Punching is considered as noise or interference and removes；Pulse of the amplitude between a~b is considered as the particulate matter that the partial size detected is less than 1um
The optical signal of scattering, corresponding PM1.0；Pulse of the amplitude between b~c is considered as the particulate matter that the partial size detected is less than 2.5um
The optical signal of scattering, corresponding PM2.5；Pulse of the amplitude between c~d is considered as particulate matter of the partial size less than 10um detected and dissipates
The optical signal penetrated, corresponding PM10.
As shown in Fig. 2, further determining that the value of a, b, c, d.By particle concentration detection device of the present invention and standard
Concentration detection device (such as U.S.'s TSI8530 dust measurement) is placed in dustless closed experimental box, is discharged into experimental box
Partial size is less than the particulate matter (for example passing through burning cigarette) of 1um and is allowed to be evenly distributed in cabinet (can use fan in cabinet
It blows and disturbs).While discharging particulate matter, with the intracorporal particle concentration of normal concentration detection device monitoring case, it is allowed to certain
Maximum concentration within the scope of (the present embodiment 2000ug/m3) in certain intervals value (the present embodiment choose 50,100,200,
300,500,1000,2000ug/m3) releasing by parts.The maximum value of selection is bigger, then particle concentration detection dress of the present invention
It sets bigger to the detection range of air particle concentration；Segmentation is more, and the degree of fitting of concentration curve is higher, then concentration value detection is got over
Accurately.At each fragmentation value of particle concentration, the MCU of particle concentration detection device of the present invention will also be collected
Pulse amplitude values corresponding with particle size and concentration and number of pulses.When the particle size of release is less than 1um, adopt
The impulse amplitude maximum value collected corresponds to b, and minimum value corresponds to a；When the particle size of release is in 1um~2.5um, collect
Impulse amplitude maximum value correspond to c, when the particle size of release is in 2.5um~10um, collected impulse amplitude is maximum
It is worth corresponding d.Meanwhile MCU records the number of pulses of each concentration fragmentation value under above-mentioned a, b, c, d variable grain object partial size subregion,
And obtain nonlinear fitting curve.Attached drawing 3 is nonlinear fitting curve synoptic diagram, the Nonlinear Quasi of each partial size subregion of a, b, c, d
It is similar to close curve.
When particle concentration detection device of the present invention works in real atmosphere environment, grain may be mixed in air
Diameter is different and concentration also different particulate matter, MCU will collect impulse amplitude corresponding with particulate matter scattering light and arteries and veins
Quantity is rushed, nonlinear fitting curve corresponding with a, b, c, d is inquired according to pulse height distribution, further according to nonlinear fitting curve
Inquiry calculates particle concentration value, then can be obtained by the particulate matters such as PM1.0, PM2.5, PM10 in atmospheric environment to be measured
Concentration.
It can be seen that air particle concentration detection apparatus of the present invention and nonlinear fitting curved line arithmetic are not only not required to
Will Maxwell equation and Bessel function, Hankel function etc. based on Mie theory complicated calculations, and can basis
The nonlinear fitting curve that reference standard concentration detection device generates, obtains including the different-grain diameters such as PM1.0, PM2.5, PM10
The concentration value of air particle has many advantages, such as that particle concentration detection range is wide, consistency is good, detection speed is fast.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.
It is further to note that specific technical features described in the above specific embodiments, in reconcilable situation
Under, it can be combined in any appropriate way, in order to avoid unnecessary repetition, the present invention is to various possible combinations
No further explanation will be given for mode.In addition, various embodiments of the present invention can be combined randomly, as long as its
Without prejudice to thought of the invention, it should also be regarded as the disclosure of the present invention.
Claims (4)
1. a kind of air particle concentration detection apparatus characterized by comprising laser diode, photodiode, air duct,
Drawing fan, lens, MCU；
For the laser beam of the laser diode transmitting through lens focus at pencil, laser beam is irradiated to particulate matter sensing chamber in air duct
Air atom on scatter, photodiode below particulate matter sensing chamber receives scattering light, and converts optical signals to
Electric signal inputs MCU.
2. a kind of air particle concentration detection apparatus as described in claim 1, which is characterized in that the air duct is to allow
Air is able to maintain stable air-flow under the action of drawing fan and flows through particulate matter sensing chamber.
3. a kind of detection method of air particle concentration detection apparatus as described in claim 1, which is characterized in that
The impulse amplitude of the MCU acquisition photodiode output, since the partial size of air particle is bigger, impulse amplitude is got over
Greatly, therefore in full range, amplitude is lower than a or the pulse higher than d is considered as noise or interference and removes；Amplitude is in a~b
Between pulse be considered as the optical signal that the particulate matter of the partial size that detects less than 1um scatters, corresponding PM1.0；Amplitude b~c it
Between pulse be considered as the optical signal that the particulate matter of the partial size that detects less than 2.5um scatters, corresponding PM2.5；Amplitude c~d it
Between pulse be considered as the optical signal that the particulate matter of the partial size that detects less than 10um scatters, corresponding PM10.
4. a kind of detection method of air particle concentration detection apparatus as claimed in claim 3, which is characterized in that
When the particle concentration detection device works in real atmosphere environment, it is different and dense that partial size may be mixed in air
Also different particulate matter is spent, MCU will collect impulse amplitude corresponding with particulate matter scattering light and number of pulses, according to
Pulse height distribution inquires nonlinear fitting curve corresponding with a, b, c, d, inquires or calculates further according to nonlinear fitting curve
Particle concentration value then can be obtained by the particle concentrations such as PM1.0, PM2.5, PM10 in atmospheric environment to be measured.
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| CN201811431569.8A CN109520899A (en) | 2018-11-27 | 2018-11-27 | A kind of air particle concentration detection method and device |
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| CN201811431569.8A CN109520899A (en) | 2018-11-27 | 2018-11-27 | A kind of air particle concentration detection method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112461852A (en) * | 2020-11-06 | 2021-03-09 | 中广核核电运营有限公司 | Cleaning detection method, system, device, equipment and storage medium for circuit board |
| CN116124659A (en) * | 2023-01-03 | 2023-05-16 | 深圳市正精达仪器有限公司 | Smoke particle concentration monitoring method, smoke concentration detector and storage medium |
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| Publication number | Priority date | Publication date | Assignee | Title |
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Application publication date: 20190326 |