Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Air particle counting method and device

A technology of air particle and counting method, which is applied in the direction of measuring device, individual particle analysis, particle and sedimentation analysis, etc., can solve the problem of inability to produce correct estimation of suspended particle size, limited accuracy of particle counting and size estimation, and inaccurate test results. Accuracy and other issues to achieve the effect of simple structure, low cost, good prediction and compensation

Pending Publication Date: 2018-10-26
FOSHAN SENSICFUSION TECH CO LTD
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is difficult to observe the entire range with a light detector (because the difference in electrical signal intensity is as high as 1,000,000 times or more), so it cannot produce a correct estimate of the size of suspended particles in all aerosols
For example, when the particle size is large, the signal with high scattering signal intensity accounts for a large proportion, and the signal can easily reach level saturation.
The voltage difference that a single electronic amplification system can cover is only ten or twenty times, and it can only estimate the distribution of particle size and number in a very narrow light intensity receiving range, resulting in very limited accuracy of particle counting and size estimation
[0004] In addition, it is difficult to determine whether the luminosity observed from a single fixed spatial position is related to particle size or particle shape / material
These limitations lead to incomplete detection methods of existing equipment and inaccurate test results
For example, existing equipment cannot directly determine whether the particle size meets PM2.5, that is, the particle size is 2.5 microns

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Air particle counting method and device
  • Air particle counting method and device
  • Air particle counting method and device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A method for counting air particles. The laser beam and the fluid channel are perpendicularly intersected to produce scattered light. The scattered light generated is collected by two scattered light collection boards from two spatial directions at the same time; the two scattered light collection boards generate electrical signals and undergo different The subsequent signal amplifying circuits are amplified separately with different magnifications; the amplified electrical signals and amplitude distributions are statistically analyzed and processed, and the peak morphologies of electrical signals of different intensities are measured, and the number of particles of different sizes is obtained by calculation. The two scattered light collecting plates have the same size and are arranged in parallel on both sides of the fluid channel.

[0038] Since the optical signal, the electrical signal and the light collecting device are on three axes respectively, we use a three-dimensi...

Embodiment 2

[0042] The method for counting air particles provided in this embodiment is basically the same as the first embodiment, except that the amplification factor of each subsequent signal amplifying circuit is adjusted so that the amplification factor of the two subsequent signal amplifying circuits is the same. In this way, the influence of particle shape on the estimation of particle size is eliminated by calculation. When the magnification of the two light collectors is the same, the light reception is increased twice, which can reduce the energy output of the light source, reduce energy consumption, and extend the product life time.

Embodiment 3

[0044] This embodiment provides an air particle counting method, which is basically the same as the first embodiment. The difference is that there are two measurement points, the lasers irradiated at different measurement points have different wavelengths, and two laser beams with different wavelengths are used. To achieve comprehensive detection and improve the accuracy of air particle size estimation.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
Login to View More

Abstract

The invention discloses an air particle counting method. The method comprises the following steps: enabling laser beams and a fluid pathway to vertically cross to generate scattered lights, and collecting the generated scattered lights from two space directions simultaneously by two scattered light collection plates; enabling the two scattered light collection plates to generate electric signals,and respectively amplifying the electric signals by virtue of different follow-up signal amplification circuits at different amplification factors; and performing statistical analysis processing on each amplified electric signal and amplitude distribution, measuring peak morphology of the electric signals of different intensity, and calculating to obtain the quantities of particles of different sizes. The air particle counting device is simple in structure and low in cost, comprehensive signal collection can be provided for the scattered lights, overall statistics of air particles of differentsizes can be realized, the quantity statistics accuracy of the air particles of various sizes is improved, and the influences of the morphology and shape of the air particles on counting can be eliminated, The invention further provides an air particle counting device.

Description

Technical field [0001] The invention relates to the technical field of air detection, in particular to a method and device for counting air particles. Background technique [0002] Measuring the presence, size and number of particles in aerosols by light scattering is a common particle counting method. Light (such as laser) shines on the particles and produces scattering (such as Mie scattering). The scattered light is detected by the photosensitive element in the space, and the existence of the particles can be detected. Due to the large range of particle size in air samples (for example, from one micron to 10 microns), the intensity distribution of scattered light varies greatly. According to the Mie scattering theory, if the size is ten times different, the difference in intensity is Up to 1000000 (sixth power of ten) times. Currently, there is no system that can accurately calculate the size and quantity of all particles, especially when the air contains water molecules or ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/10
CPCG01N15/10G01N2015/1029G01N2015/1024
Inventor 刘昶
Owner FOSHAN SENSICFUSION TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products