Particle size detection method for particles

Abstract

The invention discloses a particle size detection method for particles. The method comprises the following steps of: 1, shooting scattered particles, and carrying out image analysis; 2, extracting a gray value signal curve in an image; 3, performing one-dimensional continuous wavelet transform; performing wavelet energy calculation; drawing a wavelet energy spectrum curve; 4, repeating the step 3to obtain wavelet energy spectrum curves in different directions, and superposing the wavelet energy spectrum curves in different directions to obtain wavelet energy spectrum curves changing along with the scale; 5, performing normalization processing on the wavelet energy spectrum curve; and 6, obtaining the particle size value of the particles. According to the method of the invention, rapid andaccurate measurement of median particle sizes of sediment particles such as pebbles, gravels and sand grains can be realized. The method is especially suitable for rapid interval measurement of particle sizes of overlapped sand grains.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a method for detecting the particle size of particles, in particular to a method for detecting the particle size of overlapping particles. Background technique [0002] Sediment is produced by different physical and chemical actions of materials on the earth's surface. In water environments such as coasts and rivers, sediment refers to solid particle debris that moves in fluids or is moved by water flow, wind, waves, glaciers and gravity. In coastal engineering and water conservancy engineering, such as port construction, channel maintenance, breakwater construction, land reclamation, bridge erection, dam construction, culvert excavation, etc., sediment movement is one of the environmental factors that must be considered and understood, because Sediment movement leads to erosion, stabilization or siltation of the underwater landform, which brings about probl...

AI Technical Summary

Problems solved by technology

Due to the limitations of measurement principles and equipment, each traditional method has a different particle size measurement range. The direct measurement method and the sieving method are suitable for larger sediment particles, and the indirect measurement methods are the sedimentation method and the laser method. Suitable for smaller sediment particles with higher cost

[0005] After years of development, although various traditional sediment particle size measurement and analysis methods have been greatly improved and perfected, the particle size measurement range has been continuously expanded, and the particle size measurement accuracy has been improved, but the traditional methods still have inevitable problems. flaws and contradictions

[0006] Among the various traditional methods, the measurement cost of the ruler measurement method is the lowest, but it consumes the longest time, the manual operation is complicated, and the measurement accuracy is most affected by human factors. It is only suitable for large-sized sediment particles; the measurement cost of the sieving method is relatively low , but the measurement steps are cumbersome, and the measurement results can only indicate that the size of the sediment is between the upper and lower sieve holes, that is, only the range of the size can be known, but its absolute value is not known, and it is affected by the vibration sieve time. It is suitable for sand larger than 0.06mm Larger sediment particles with a particle size; the sedimentation method has high measurement accuracy, simple operation, and strong repeatability, but the measurement speed is slow, the measurement cost is high, and the requirements for external conditions are high. It is suitable for smaller sediment particles with a particle size of 0.02mm ;

[0007] The laser method has high measurement accuracy, fast measurement speed, simple operation, high degree of automation and strong repeatability, but the measurement cost is higher than that of the sedimentation method, and it has higher requirements for external conditions

Unable to achieve large-scale promotion and use

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