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Mixed Field Particle Size Measurement Method Based on Mean Filtering

A technology of mean value filtering and measurement method, which is applied in the field of improving the accuracy of particle size measurement, can solve the problems such as the method of particle size measurement of mixed particle field is not proposed, and achieve the effect of improving measurement accuracy

Inactive Publication Date: 2018-08-21
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] No particle size measurement method suitable for mixed particle fields has been proposed so far

Method used

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  • Mixed Field Particle Size Measurement Method Based on Mean Filtering
  • Mixed Field Particle Size Measurement Method Based on Mean Filtering
  • Mixed Field Particle Size Measurement Method Based on Mean Filtering

Examples

Experimental program
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Embodiment 1

[0040] Example 1: Interferometric Particle Imaging System

[0041] In the interference particle imaging system adopted in the present invention, the wavelength of the emitted light of the laser is 532nm, and the maximum output power is 4W. After beam expansion, spatial filtering, and collimation, the laser beam is compressed into a 1mm sheet laser beam by a cylindrical lens. A Nikon AF50mm f / 1.8D fixed-focus lens is used as an imaging lens to collect scattered light from particles. The receiving device is a CCD with a pixel size of 3.45 μm and an effective pixel number of 2448*2048. The system scattering angle is 60°, the system magnification is M=0.159, and the object distance is Z l =364.37mm, image distance Z i =57.95mm, collection angle w=5.612°. The particles to be measured are polystyrene spherical particles with sizes of 21.3um, 45um and 57.9um respectively, and the particles are placed in deionized water during the observation process.

[0042] The data of each li...

Embodiment 2

[0047] Example 2: particle size extraction and error elimination

[0048] The particle size calculation formula is

[0049]

[0050] where N is the number of fringes, w and θ are the collection angle and scattering angle, respectively, λ is the laser wavelength, n 1 is the refractive index of the surrounding medium.

[0051] Figure 5 The positioning results of the interference fringe pattern of particle fields with different particle sizes and mixed particle fields by this method are given. The invention has the function of removing coarse errors, and the fringe circles judged as coarse errors are marked in Figure 6 , compare the single particle field particle size calculation method with the method proposed by the invention, and deal with the Figure 5 The four kinds of particle field interference fringe diagrams are shown, and the relative error fitting diagram of the particle size calculation results is shown as Figure 7 Shown, wherein RE represents relative error...

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Abstract

The invention discloses a mixed field particle size measuring method based on average filtering. The average filtering and the 3 sigma criterion are taken as bases, particle sizes are calculated through different template coefficients, and the obtained average particle size value is taken as a final particle size calculation result; multiple calculation results are adopted for judgment, so as to get rid of the gross error and improve the measurement accuracy. The mixed field particle size measuring method has the effect of providing bases for measurement of the complex particle field, and meanwhile the selecting principle of the average filtering template of an interference fringe diagram can be obtained, so as to provide experimental bases for measurement of particles with different sizes in an optical system.

Description

technical field [0001] The invention provides a mixed-field particle size measurement method in an interference particle imaging system, and particularly relates to the improvement of particle size measurement accuracy. Background technique [0002] Particle size measurement is of great significance in industry, cloud microphysical detection and engineering measurement. Interferometric particle imaging measurement technology is widely used in the acquisition of particle size and particle spatial distribution. This method has the advantages of non-contact, high precision, and fast speed. Its research technology is relatively mature, and the research objects are mostly spherical particles of the same size. In actual particle fields such as suspended particles in the atmosphere, raindrops, and human cells, the particle sizes are not the same. Therefore, it is of great significance to study the interferometric imaging processing algorithm suitable for mixed particle fields to im...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/02G06F17/50
CPCG01N15/02G06F30/20
Inventor 张红霞孙金露李娇贾大功刘铁根
Owner TIANJIN UNIV