Method for converting equivalent grain size of non-spherical bubble

Abstract

The invention discloses a method for converting equivalent grain size of a non-spherical bubble. The method comprises the following steps: calculating a coordinate of the center of mass for each bubble contour, establishing a plane right angle coordinate system with the center of mass as an origin of coordinates, separately calculating the numbers of pixels corresponding to radiuses in an X-axis direction and a Y-axis direction of the bubble contour and separately marking as rx, ry; separately selecting the rx and ry as the number of pixels rz corresponding to a radius in a Z-axis direction of a spatial right angle coordinate system of the bubble contour, calculating the volumes of two ellipsoids in accordance with an ellipsoid calculation formula, and solving a mean value of the volumes of the two ellipsoids as the volume of the non-spherical bubble; calculating the equivalent grain size of the non-spherical bubble by using a spherical volume formula. According to the invention, the method can implement 3D equivalent volume calculation of a 2D micro non-spherical bubble image, and can reduce errors in the course of equivalent conversion, increase precision of volume calculation, and further increase precision of equivalent spherical bubble grain size.

Description

technical field [0001] The invention belongs to the technical field of water body detection, and in particular relates to a method for calculating the particle size of bubbles proposed for bubbles dissolved in water body samples. Background technique [0002] There is a problem of eutrophication in urban lakes in my country. According to the survey data and evaluation indicators, among the 37 major lakes in my country, the proportion of mesotrophic and mesotrophic types has exceeded half. Nutritional type accounted for 8.8%. Existing research results show that suitable temperature, slow water flow, and relatively sufficient nutrients such as total phosphorus and total nitrogen will all lead to explosive proliferation of planktonic algae, resulting in eutrophication. Air flotation technology is a relatively good algae removal and water purification technology, and the algae removal rate can reach more than 95% under suitable conditions. Therefore, the air flotation water pur...

AI Technical Summary

Problems solved by technology

However, affected by external factors such as gravity and seawater tension, the bubble contours extracted from the bubble image may not be completely regular spheres. If the irregular bubble contours are simply calculated according to the particle size calculation method of spherical bubbles Calculating its physical parameters will obviously lead to inaccurate particle size calculation results, which will adversely affect the accurate analysis of the particle size distribution of seawater bubbles in the later stage and the accurate prediction of seawater eutrophication.

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