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A Measuring Method of Uniform Particle Size Based on Autocorrelation Algorithm

A particle size and measurement method technology, which is applied to the particle size measurement of beans, can solve the problems of time-consuming and cumbersome, cannot be popularized and used, and expensive experimental instruments, and achieve low equipment cost, low external environment requirements, Wide range of effects

Inactive Publication Date: 2017-07-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sieving method is the most commonly used method in China, but it is time-consuming and cumbersome due to the limitation of the experimental environment; the sedimentation method is only suitable for finer particles and requires uniform texture and is not easy to deform in water; the laser diffraction method is only suitable for fine particles and Experimental instruments are expensive and cannot be popularized and used

Method used

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  • A Measuring Method of Uniform Particle Size Based on Autocorrelation Algorithm
  • A Measuring Method of Uniform Particle Size Based on Autocorrelation Algorithm
  • A Measuring Method of Uniform Particle Size Based on Autocorrelation Algorithm

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Embodiment 1

[0029] figure 1 A set of measuring equipment capable of realizing the measuring method of the present invention is shown, and the measuring equipment is composed of image acquisition equipment and a computer. The image acquisition device includes a black flat panel 1 , a tripod 2 , a level 3 , a digital camera 4 , a size calibration object 5 and a glass plate 6 ; the digital camera 4 is connected to a computer 8 .

[0030] like figure 2 Shown, a kind of uniform particle size measuring method based on autocorrelation algorithm of the present invention comprises the following steps:

[0031] (1) Take an image of the target particle 7, taking beads as an example, specifically including the following sub-steps:

[0032] (1.1) Spread the target particle 7 on the black flat plate 1, flatten it with a glass plate 6, remove the glass plate 6 and place the size calibration object 5; in order to avoid affecting the subsequent image processing, the size calibration object 5 should be ...

Embodiment 2

[0048] The method of the present invention is applied to measure sand, gravel and pebbles between 1-20mm in 11 groups of particle diameters, and equally utilizes figure 1 Measuring equipment shown. The measurement procedure is the same as that of Example 1. After step 2.2, 11 groups of grayscale images are obtained, 4 groups of which are as Figure 5 shown; after step 2.5, the corresponding correlation curve is obtained, such as Image 6 shown.

[0049] The long diameter, middle diameter and average particle diameter measured by the inventive method are compared with the results of long diameter, middle diameter and average particle diameter measured by digital calipers, and the comparison results are as follows: Figure 7 As shown, the horizontal axis represents the measurement result of the digital caliper, the vertical axis represents the particle size measured based on the autocorrelation algorithm in the present invention, the symbol circle represents the long diameter,...

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Abstract

The invention discloses a method for measuring uniform particle size based on an auto-correlation algorithm. The method comprises two steps of photographing a target particle image and processing the image by the auto-correlation algorithm to obtain the particle size. The image of the target particle on a plate is photographed through a digital camera, proportional relationship of actual length and pixel length is determined through a size calibration object, the image of which gray is processed is moved in eight directions in a selected target area, correlations of the area before and after the image is moved are respectively calculated, a correlation curve is drawn, the displacement distances of movement in the eight directions which firstly return to a rising top are determined and converted to actual lengths according to the proportional relationship, the maximum length in eight lengths is adopted as the long diameter of the target particle, the minimum length in the eight lengths is adopted as the middle diameter, and the mean value of the eight lengths is adopted as the mean particle size. By using the method for measuring the uniform particle size based on the auto-correlation algorithm, field measurement and on-site real-time measurement are realized, and accuracy measurement on long diameters, middle diameters and mean particle size of fine sand samples, coarse beans and pebbles is realized through universal available equipment.

Description

technical field [0001] The invention relates to a particle size measurement method, which is especially suitable for particle size measurement of better sorted particles, such as uniform sand, granular activated carbon and beans. Background technique [0002] In the experimental research and production practice in the fields of geology, materials, environmental protection, etc., the particle size measurement and analysis of particles are of great significance. The traditional particle size analysis methods mainly include sieving method, sedimentation method and laser diffraction method. The sieving method is the most commonly used method in China, but it is time-consuming and cumbersome due to the limitation of the experimental environment; the sedimentation method is only suitable for finer particles and requires uniform texture and is not easy to deform in water; the laser diffraction method is only suitable for fine particles and Experimental instruments are expensive an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T7/00G06T7/49G06T7/62
Inventor 成志轩刘海江邓小虎赖富春马国淇王坤鹏叶洲腾
Owner ZHEJIANG UNIV