CN115389384A - Particle concentration detection system and method based on forward particle counter coupled lateral photometer - Google Patents

Particle concentration detection system and method based on forward particle counter coupled lateral photometer Download PDF

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CN115389384A
CN115389384A CN202211036983.5A CN202211036983A CN115389384A CN 115389384 A CN115389384 A CN 115389384A CN 202211036983 A CN202211036983 A CN 202211036983A CN 115389384 A CN115389384 A CN 115389384A
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particle
silicon photodiode
photosensitive area
light
lateral
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赵恒�
张荣瑞
常琦
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Xian University of Technology
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Xian University of Technology
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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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/01—Arrangements or apparatus for facilitating the optical investigation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/51—Scattering, i.e. diffuse reflection within a body or fluid inside a container, e.g. in an ampoule
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
    • Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters

Abstract

The invention discloses a particle concentration detection system based on a forward particle counter coupled lateral photometer, which comprises a light source module, a photosensitive area detection module and a data processing module, wherein the light source module is used for detecting the particle concentration of a particle; the light source module comprises an outer shell, a semiconductor laser and a light trap are arranged in the outer shell, and light beams emitted by the semiconductor laser are constrained by the multistage diaphragms, converged in the photosensitive area and enter the light trap; photosensitive region detection module includes intake pipe and outlet duct, and intake pipe and outlet duct are located the region directly over the photosensitive region, still include preceding silicon photodiode and side direction silicon photodiode, and preceding silicon photodiode is located the photosensitive region upper right side and is 20 with the contained angle of light beam, and side direction silicon photodiode is located the photosensitive region lower right side and is 45 with the contained angle of light beam. The particle concentration detection system can output the mass concentrations of the inhalable particles with four different particle sizes in real time according to the scattered light information of the particles under the condition that a particle cutter is not used.

Description

Particle concentration detection system and method based on forward particle counter coupled lateral photometer
Technical Field
The invention belongs to the technical field of atmospheric particulate matter detection equipment, and particularly relates to a particulate matter concentration detection system based on a forward particle counter coupled with a lateral photometer, and a detection method thereof.
Background
In atmospheric and air quality studies, PMX refers to particles having an aerodynamic diameter less than or equal to x μm. PM10, PM2.5 and the like are commonly used for judging the pollution condition of the Particulate Matters (PM). New coronaviruses are becoming prevalent worldwide, seriously impacting human health and productive life. In addition to droplet and direct contact transmission, several infection events have been established to indirectly demonstrate that the novel coronaviruses can be airborne in bioaerosol form. The biological aerosol refers to aerosol containing biological particles, including bacteria, viruses, and microorganisms such as pollen, spores and ova, and has infectivity and sensitization. The viral-containing secretions or excretions can be aerosolized into infectious droplets or particles in a variety of ways, which lose moisture during suspension in the air, leaving a core of proteins and pathogens attached to the fine particulate matter to form a bioaerosol. The fine particles not only can provide a carrier for the bioaerosol, but also can directly damage a respiratory system caused by the inhalation of some particles smaller than 5 mu m by a human body. Although the fine particles such as PM1, PM2.5 and PM10 in the environment do not necessarily carry pathogenic microorganisms, and the correlation between the mass concentration of the fine particles and the virus propagation is not directly verified, studies have found that the number concentration of the particles in some environments is positively correlated with the bioaerosol concentration, and meanwhile, researchers have pointed out that more deaths of new coronary pneumonia occur in areas with serious basic pollution, especially in areas with serious air pollution such as PM2.5, more studies have shown that the air pollution such as PM2.5 and PM10 is positively correlated with the death probability of personal infected new coronary pneumonia, which all promote the detection of the mass concentration of the fine particles with low cost and high efficiency.
The method for detecting the mass concentration of the particles mainly comprises the following steps: manual reference methods, manual equivalences, and automatic equivalences. The first two methods are both to directly measure the mass of particles on the filter membrane and then divide the mass by the sampling volume to obtain the mass concentration, so the two methods are the most reliable, but the measurement period is long and the high-efficiency measurement cannot be realized. The widely used method is an automatic equivalent method, and mainly includes a TEOM (measured element scattering microscope) method, a β -ray method, and a light scattering method. TEOM and beta ray methods have good accuracy and sensitivity, but they are complex to operate, consume large materials, are expensive, and must be equipped with a size-selective inlet to remove particles outside the size.
The light scattering method has the advantages of high measuring speed, high precision, good repeatability, suitability for on-line non-contact measurement and the like, and has remarkable advantages compared with other measurements. The measurement of mass concentration of suspended particles in air based on light scattering method is mainly divided into two types, namely photometry for detecting group particles and single-particle light scattering method. The light collection angle for light scattered by a receiving particle for detecting the mass concentration of the particle by light scattering is usually 90 °. In fact, under this lighting angle, some dark aerosols with strong light absorption (such as soot, black carbon, dust, etc.) scatter a very small amount of scattered light, which is about ten times less than the scattered light energy of some particles with strong transmittance (such as glass), and some dark particles are ignored during measurement and only the brighter particles are considered to cause measurement deviation. In addition, more importantly, when the mass concentration of the particles is detected by using the traditional light scattering method, the dependency on instrument parameter calibration under different environments is strong. Both photometric and particle counting methods are very limited by the properties (complex refractive index) and density of particles, and a very complicated calibration method is required to determine the parameters of the instrument before measurement, and the measurement result is often out of reference when the measurement environment is different from the calibration environment.
Photometers and particle counters are generally considered to be two widely differing instruments, but in practice both instruments inherently detect a particle swarm photometric signal and a single particle pulse signal, with only one of the signals being analyzed by the instrument. Particle counters to ensure that a single particle appears in the light sensitive region, which is usually operated at low concentrations, the light signal scattered by certain gas molecules and the stray light of the instrument itself also form part of the background noise, directly limiting the lower limit of the particle counter for detecting particles. The photometer has good linear response in a high concentration range, but can also submerge a single particle pulse signal in a photometric signal.
Both photometers and Optical Particle Counters (OPC) can quickly monitor the mass concentration of particles in suspension. Since the photometer does not need to take into account errors caused by particle overlap, it works well in high concentration environments and the calibration of the instrument is relatively simple. OPC can invert the particle size information well, can measure the mass concentration of different particle size granules simultaneously under the condition of not using the air cutting head. The photometer works alone to mainly detect photometric voltage signals of a particle population, so that particle overlay errors are negligible to some extent. When the OPC works alone, it mainly detects a scattered pulse signal of a single particle, and can obtain a particle size distribution of the particle in real time. The photometer itself has a higher photometric response to smaller particle sizes near the wavelength. The optical controlled oscillator has a good signal-to-noise ratio for scattered pulse signals of larger particles. This allows them to have complementary ranges of detected particle sizes. The combination of both allows for a higher resolution of the detected scattered light signal. In addition, the particle size information obtained by OPC can further reflect the particle quality information, and can also more intuitively classify pollutants to determine the degree of harm to human bodies. The combination of the photometer and the particle counter may compensate for the advantages and disadvantages of both measurement methods. The method can simultaneously obtain the mass concentration of particles in different particle size ranges under the condition of not being limited by an impact cutter, and the measured concentration range is high. In addition, scattered light signals are received through a small angle, scattered light of darker particles can be well detected, and measurement errors are reduced.
Disclosure of Invention
The invention aims to provide a particle concentration detection system based on a forward particle counter coupled with a lateral photometer, which can be used for carrying out particle size segmentation according to particle sizes and detecting the mass concentration of particles in each particle size segment in real time.
Another object of the present invention is to provide the above method for detecting particulate matter concentration.
The invention adopts the technical scheme that the particle concentration detection system based on the forward particle counter coupled lateral photometer comprises a light source module, a photosensitive area detection module and a data processing module; the light source module comprises an outer shell, a semiconductor laser and a light trap are arranged in the outer shell side by side, and light beams emitted by the semiconductor laser are constrained by the multistage diaphragms, converged in the photosensitive area and enter the light trap; the photosensitive area detection module comprises an air inlet pipe and an air outlet pipe, the air inlet pipe and the air outlet pipe are positioned in the regions right above and below the photosensitive area, the photosensitive area detection module further comprises a forward silicon photodiode and a lateral silicon photodiode, the forward silicon photodiode is positioned at the right upper part of the photosensitive area and forms an included angle of 20 degrees with the light beam, and the lateral silicon photodiode is positioned at the right lower part of the photosensitive area and forms an included angle of 45 degrees with the light beam; the data processing module comprises a data acquisition card and upper computer Labview software which are electrically connected; the data acquisition card is also electrically connected with a signal amplification modulation circuit, the input end of the signal amplification modulation circuit is connected with the lateral silicon photodiode and the forward silicon photodiode, and the output end of the signal amplification modulation circuit is connected with the data acquisition card.
The present invention is also characterized in that,
one end of the air inlet pipe is connected with the main air pump, and the other end of the air inlet pipe is introduced right above the photosensitive area; still include the sheath trachea, sheath trachea one end connection sheath air pump, the other end is connected intake pipe middle part.
The semiconductor laser is clamped and fixed by a clamper.
The invention adopts another technical scheme that the particle concentration detection method based on the forward particle counter coupled lateral photometer is implemented according to the following steps:
step 1, introducing gas to be detected into a photosensitive area through a main gas pump, discharging particles to be detected through an air outlet pipe after the gas to be detected and the light beams act, and introducing pure gas without the particles into the photosensitive area through a sheath gas pump;
step 2, starting a semiconductor laser with the wave band of 650nm, shaping and focusing light beams through a multi-stage diaphragm, converging the light beams into a photosensitive area, and absorbing the light beams passing through the photosensitive area by a light trap; starting a forward silicon photodiode and a lateral silicon photodiode, and collecting light scattering signals of particles; the lateral silicon photodiode and the forward silicon photodiode are subjected to signal amplification modulation circuit, the data acquisition card records the acquired information, and the acquired information is processed in the Labview software of the upper computer to obtain the mass concentration information of the particulate matters.
The present invention is also characterized in that,
the detector of the forward silicon photodiode processes the particle light scattering signal by the following steps:
firstly, calibrating a coefficient K by utilizing a plurality of standard particle samples, wherein the calculation formula is shown as a formula (1);
Figure BDA0003815685970000051
in the formula (1), v i The pulse voltage, N (v) of the i-th standard particle sample i ) Is v is i Number of voltages, K being the scaling factor, C m.std Is the mass concentration of the standard particle sample;
the standard particulate matter samples are particulate matters of PM2.5, PM4 and PM10 respectively;
the mass concentration of the particles under different particle size sections is shown as the formula (2);
Figure BDA0003815685970000061
in the formula (2), C m Is the mass concentration of the particle sample to be measured.
The detector of the side silicon photodiode processes the scattering signal as follows:
first, use PM 1 Standard particle sample, K for different aerosol environments PSC As shown in formula (3);
Figure BDA0003815685970000062
in the formula (3), C m,PM1,std Represents PM 1 Mass concentration of standard particle sample, U P Indicating the photometric voltage of the detector of the lateral silicon photodiode;
further obtaining PM 1 Mass concentration of particulate matter
Figure BDA0003815685970000063
As shown in formula (4):
Figure BDA0003815685970000064
the particle concentration detection system has the beneficial effects that under the condition that a particle cutter is not used, the mass concentrations of the inhalable particles with four different particle sizes can be output in real time according to the scattered light information of the particles; the traditional 90-degree light scattering method usually ignores the particles with deep color and strong light absorption, and the forward detection angle measurement adopted in the invention can reduce the measurement error; when the mass concentration of the particles is detected by traditional light scattering, the dependency on instrument parameter calibration under different environments is strong, and the measurement result of the invention mainly depends on particle size information and is not very sensitive to particle attributes, so that the invention has good accuracy under the condition of large environmental change.
Drawings
FIG. 1 is a schematic diagram of a particle concentration detection system based on a forward particle counter coupled with a lateral photometer according to the present invention;
FIG. 2 is a schematic view of the interior of an outer housing of the particulate matter concentration detection system of the present invention;
FIG. 3 is a graph comparing the particle concentration measurement system of the present invention with the TSI8530 measurement of mass concentration.
In the figure: 1. the device comprises a semiconductor laser, 2 a clamper, 3 a multi-stage diaphragm, 4 a photosensitive area, 5 a signal amplification modulation circuit, 6 a data acquisition card, 7 a lateral silicon photodiode, 8 an outer shell, 9 upper computer Labview software, 10 a light trap, 11 a forward silicon photodiode, 12 an air outlet pipe, 13 a sheath air pipe, 14 an air inlet pipe, 15 a main air pump and 16 a sheath air pump.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
The invention relates to a particle concentration detection system based on a forward particle counter coupled lateral photometer, which comprises a light source module, a photosensitive area detection module and a data processing module, wherein the light source module, the photosensitive area detection module and the data processing module are arranged in the front of the particle counter;
the light source module comprises an outer shell 8, as shown in fig. 2, a semiconductor laser 1 and a light trap 10 are arranged in the outer shell 8 side by side, and the semiconductor laser 1 is clamped and fixed by a clamp 2; light beams emitted by the semiconductor laser 1 are constrained by the multistage diaphragm 3, converged in the photosensitive area 4 and enter the optical trap 10;
the semiconductor laser 1 emits uniform and stable laser beams, the laser beams pass through the multistage diaphragm 3 to perform constraint collimation on the light path, stronger and more uniform beams in the center of the laser beams are reserved, and the influence of uneven Gaussian light on measurement is reduced. The light beams after being constrained are converged in the photosensitive area 4; an optical trap 10 is designed at the end of the optical path, and the optical trap 10 can absorb redundant scattered light to reduce the influence of the stray light on the measurement.
The photosensitive region detection module comprises an air inlet pipe 14 and an air outlet pipe 12, the air inlet pipe 14 and the air outlet pipe 12 are positioned in the regions right above and below the photosensitive region 4, and the two ends of the air inlet pipe 14 and the two ends of the air outlet pipe 12 are respectively provided with an inlet and an outlet; one end of the air inlet pipe 14 is connected with the main air pump 15, and the other end of the air inlet pipe is introduced to the position right above the photosensitive area 4; the sheath air pump is characterized by further comprising a sheath air pipe 13, one end of the sheath air pipe 13 is connected with the sheath air pump 16, and the other end of the sheath air pipe 13 is connected with the middle of the air inlet pipe 14; the sheath trachea 13 and the air inlet pipe 14 are both positioned in the area right above the photosensitive area 4; a clean gas free of particles is pumped into the photosensitive zone 4.
The light source device also comprises a forward silicon photodiode 11 and a lateral silicon photodiode 7, wherein the forward silicon photodiode 11 is positioned at the upper right of the photosensitive area 4 and has an included angle of 20 degrees with a light beam, and the lateral silicon photodiode 7 is positioned at the lower right of the photosensitive area 4 and has an included angle of 45 degrees with the light beam; convex lenses on the forward silicon photodiode 11 and the lateral silicon photodiode 7 are used for converging the scattered light of the particles;
the data processing module comprises a data acquisition card 6 and upper computer Labview software 9 which are electrically connected; the voltage signal output by the data acquisition card 6 is sent to an upper computer Labview software 9 for processing, and is used for processing the particulate matter scattering signal and outputting the mass concentration information of the particulate matter.
The data acquisition card 6 is also electrically connected with the signal amplification modulation circuit 5, the input end of the signal amplification modulation circuit 5 is connected with the lateral silicon photodiode 7 and the forward silicon photodiode 11, and the output end is connected with the data acquisition card 6;
the invention relates to a particle concentration detection method based on a forward particle counter coupled lateral photometer, which is implemented by the following steps:
step 1, introducing gas to be detected into a photosensitive area 4 through a main gas pump 15, discharging particulate matters to be detected through an air outlet pipe 12 after the gas to be detected and the laser beams are acted, introducing pure gas without the particulate matters into the photosensitive area 4 through a sheath gas pump 16, and diluting the concentration of the particles in the photosensitive area 4 to enlarge the detection concentration range;
step 2, starting the semiconductor laser 1 with the wave band of 650nm, shaping and focusing laser beams through the multistage diaphragm 3, converging the laser beams into the photosensitive area 4, and absorbing the laser beams passing through the photosensitive area 4 by the optical trap 10 in order to inhibit stray light inside the shell 8; and starting the forward silicon photodiode 11 and the lateral silicon photodiode 7 to collect light scattering signals of particles in the sampled gas. Wherein, the forward silicon photodiode 11 collects the light intensity pulse signal of the particles, and the lateral silicon photodiode 7 collects the luminosity voltage signal of the particles. The lateral silicon photodiode 7 and the forward silicon photodiode 11 are subjected to signal amplification modulation circuit 5, the data acquisition card 6 records the acquired information, and the acquired information is processed in the Labview software of the upper computer to obtain the mass concentration information of the particulate matters;
the detector of the forward silicon photodiode 11 is used for detecting particulate matters larger than 1 μm, the detection object is mainly the mass concentration of the particulate matters within the ranges of PM2.5, PM4 and PM10, and the forward silicon photodiode 11 has good signal-to-noise ratio within the range; the detector of the lateral silicon photodiode 7 is used to detect particles smaller than or equal to 1 μm, and the detection object is mainly the mass concentration of particles in the PM1 range, and the lateral silicon photodiode 7 has good sensitivity in this range according to the selected wavelength of the semiconductor laser 1.
The detector of the forward silicon photodiode 11 processes the particle light scattering signal as follows:
firstly, calibrating a coefficient K by utilizing a plurality of standard particle samples, wherein the calculation formula is shown as a formula (1);
Figure BDA0003815685970000091
in the formula (1), v i The pulse voltage, N (v), of the i-th standard particle sample i ) Is v is i Number of voltages, K being the scaling factor, C m.std Is the mass concentration of the standard particle sample;
the standard particulate matter samples are particulate matters of PM2.5, PM4 and PM10 respectively;
the mass concentration of the particles under different particle size sections is shown as the formula (2);
Figure BDA0003815685970000101
in the formula (2), C m The mass concentration of the particle sample to be detected;
the detector of the lateral silicon photodiode 7 processes the scattering signal as follows:
first, use PM 1 Standard particle sample, K for different aerosol environments PSC As shown in formula (3);
Figure BDA0003815685970000102
in the formula (3), C m,PM1,std Represents PM 1 Mass concentration of standard particle sample, U P Indicating the photometric voltage of the detector of the lateral silicon photodiode 7;
further obtaining PM 1 Mass concentration of particulate matter
Figure BDA0003815685970000103
As shown in formula (4):
Figure BDA0003815685970000104
the real-time mass concentration of the inhalable particles with different particle sizes can be measured by the inversion formula. Reuse of standard instrumentsTSI-8530 and the method of the invention are compared and detected, the measurement results of the TSI-8530 and the method of the invention are fitted under different particle sizes to obtain a correlation coefficient R of the fitted straight line as shown in figure 3 2 The mass concentration of the particles with four different particle sizes can be effectively measured by the system, wherein the mass concentration of the particles is more than 0.9, and thus the detected data under different particle sizes are highly correlated with the standard data.

Claims (6)

1. The particle concentration detection system based on the forward particle counter coupled with the lateral photometer is characterized by comprising a light source module, a photosensitive area detection module and a data processing module; the light source module comprises an outer shell (8), a semiconductor laser (1) and a light trap (10) are arranged in the outer shell (8) side by side, and light beams emitted by the semiconductor laser (1) are constrained by a multi-stage diaphragm (3), converged in a photosensitive area (4) and enter the light trap (10); the photosensitive area detection module comprises an air inlet pipe (14) and an air outlet pipe (12), wherein the air inlet pipe (14) and the air outlet pipe (12) are positioned in regions right above and below the photosensitive area (4), the photosensitive area detection module further comprises a forward silicon photodiode (11) and a lateral silicon photodiode (7), the forward silicon photodiode (11) is positioned at the upper right of the photosensitive area (4) and forms an included angle of 20 degrees with a light beam, and the lateral silicon photodiode (7) is positioned at the lower right of the photosensitive area (4) and forms an included angle of 45 degrees with the light beam; the data processing module comprises a data acquisition card (6) and upper computer Labview software (9) which are electrically connected; the data acquisition card (6) is also electrically connected with the signal amplification modulation circuit (5), the input end of the signal amplification modulation circuit (5) is connected with the lateral silicon photodiode (7) and the forward silicon photodiode (11), and the output end of the signal amplification modulation circuit is connected with the data acquisition card (6).
2. The particle concentration detection system based on the forward particle counter coupled lateral photometer as claimed in claim 1, wherein one end of the air inlet pipe (14) is connected with the main air pump (15), and the other end thereof is opened right above the photosensitive area (4); the air-assisted sheath air pump is characterized by further comprising a sheath air pipe (13), wherein one end of the sheath air pipe (13) is connected with the sheath air pump (16), and the other end of the sheath air pipe is connected with the middle of the air inlet pipe (14).
3. The particle concentration detection system based on the forward particle counter coupled lateral photometer of claim 1, wherein the semiconductor laser (1) is clamped and fixed by a clamper (2).
4. The particle concentration detection method based on the forward particle counter coupled with the lateral photometer is characterized by comprising the following steps of:
step 1, introducing gas to be detected into a photosensitive area (4) through a main air pump (15), discharging particles to be detected through an air outlet pipe (12) after the action with light beams is completed, and introducing pure gas without the particles into the photosensitive area (4) through a sheath air pump (16);
step 2, a semiconductor laser (1) with the wave band of 650nm is started, light beams are shaped and focused through a multi-stage diaphragm (3) and converged into a photosensitive area (4), and the light beams passing through the photosensitive area (4) are absorbed by a light trap (10); starting a forward silicon photodiode (11) and a lateral silicon photodiode (7) and collecting light scattering signals of particles; the lateral silicon photodiode (7) and the forward silicon photodiode (11) pass through a signal amplification modulation circuit (5), collected information is recorded by a data acquisition card (6), and the collected information is processed in an upper computer Labview software (9) to obtain the mass concentration information of the particulate matters.
5. The particle concentration detection method based on the forward particle counter coupled lateral photometer of claim 4, wherein the processing of the particle light scattering signal by the detector of the forward silicon photodiode (11) is as follows:
firstly, calibrating a coefficient K by utilizing a plurality of standard particle samples, wherein the calculation formula is shown as a formula (1);
Figure FDA0003815685960000021
in the formula (1), v i The pulse voltage, N (v), of the i-th standard particle sample i ) Is v is i Number of voltages, K being the scaling factor, C m.std Is the mass concentration of the standard particle sample;
the standard particulate matter samples are respectively particulate matters of PM2.5, PM4 and PM 10;
the mass concentration of the particles under different particle size sections is shown as the formula (2);
Figure FDA0003815685960000031
in the formula (2), C m Is the mass concentration of the particle sample to be measured.
6. The particle concentration detection method based on the forward particle counter coupled lateral photometer as claimed in claim 4, wherein the scattered signal is processed by the detector of the lateral silicon photodiode (7) by the following steps:
first, use PM 1 Standard particle sample, K for different aerosol environments PSC As shown in formula (3);
Figure FDA0003815685960000032
in formula (3), C m,PM1,std Represents PM 1 Mass concentration of standard particle sample, U P Indicating the photometric voltage of the detector of the lateral silicon photodiode (7);
further obtaining PM 1 Mass concentration of particulate matter
Figure FDA0003815685960000033
As shown in formula (4):
Figure FDA0003815685960000034
CN202211036983.5A 2022-08-25 2022-08-25 Particle concentration detection system and method based on forward particle counter coupled lateral photometer Pending CN115389384A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117571569A (en) * 2023-10-19 2024-02-20 西安理工大学 Atmospheric particulate concentration detection system and detection method based on mass concentration factor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117571569A (en) * 2023-10-19 2024-02-20 西安理工大学 Atmospheric particulate concentration detection system and detection method based on mass concentration factor

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