Method for measuring uniform particle size based on auto-correlation algorithm

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...

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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

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