Measurement method for low sand content based on B-type ultrasound imaging technology

Abstract

The invention provides a measurement method for a low sand content based on a B-type ultrasound imaging technology. The measurement method comprises the following steps of: directly imaging suspended sand grains in water by virtue of a B-type ultrasound instrument so as to obtain image information of the sand grains in the water at first, and then filtering background noise of images, extracting image areas or grey-level areas occupied by bright specks of the sand grains in the images, calculating the image area concentration or the grey-level area concentration of the sand grains, and finding a corresponding value according to a corresponding relationship between the image area concentration and an actual sand content or a corresponding relationship between the grey-level area concentration and the actual sand content, so as to obtain the to-be-measured sand content. Via the measurement method provided by the invention, the spatial concentration distribution and the dynamic movement process of the sand grains on a section can be reflected and measured in real time, and the intuitive and visible movement images and the concentration distribution rule of the sand grains can be provided for technicians in the related fields; and the measurement method has the advantages of being high in adaptability, good in timeliness, comprehensive in function, as well as convenient and fast to operate.

Description

technical field [0001] The invention belongs to the technical field of river port hydraulic model measurement, and in particular relates to a low sediment content measurement method based on B-ultrasonic imaging technology. Background technique [0002] In the study of sand particles and the hydraulic model test of the river port, the sand content of the model section and its concentration distribution along the vertical line are of great significance to the study of the sand movement law and the evolution law of the river bed; at present, the low sand content The measurement mainly adopts optical and acoustic methods. The most widely used is the optical turbidimeter. It is based on the extinction principle to realize the measurement of the concentration of suspended particles or the sediment content. It is mainly used for the measurement of turbidity in industrial occasions such as water plants. The measurement method is affected by the difference in light transmission char...

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Problems solved by technology

[0002] In sand research and river port hydraulic model tests, the sand concentration of the model section and its concentration distribution characteristics along the vertical line are of great significance to the study of sand movement laws and river bed evolution laws; at present, low sand concentration The measurement mainly adopts optical and acoustic methods, and the most widely used is the optical turbidity meter, which is based on the principle of extinction to measure the concentration of suspended particles or sand content, and is mainly used for the measurement of turbidity in industrial occasions such as water plants. The measurement method is affected by the difference in light transmission characteristics of different materials and the particl

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