Ultrasonic measurement method for large turbidity monitoring and implementation of measurement system
                                                                       ZOU Qinwen, WANG Ying
                   (Faculty of Machanical Engineering & Automation, Zhejiang SciTech University, Hangzhou 310018, China)

Abstract: Aiming at the problems that the traditional optical turbidimeter has small measuring range and the measurement result is easily interfered by environmental factors, the traditional turbidity measurement method and ultrasonic attenuation model were studied. A method of measuring the turbidity of the mixed liquid by ultrasonic attenuation was proposed, and based on the combination of virtual instruments and hardware modules,a set of ultrasonic attenuation measurement system was designed. The sand was used as the experimental object to carry out the experiment, and the relationship between ultrasonic attenuation, concentration and turbidity was completed. The experimental results show that in the sediment mixture, and there is a good linear relationship between the ultrasonic attenuation coefficient and the concentration of the mixture. The fitting curve fits more than 0.97. The liquid turbidity also has a good linear relationship, and the fitting curve has a fitting degree of 0.995. It is feasible to measure the turbidity value of the large turbidity mixture by using ultrasonic attenuation.

Key words: mixed liquid; turbidity measurement; ultrasonic attenuation; concentration; virtual instrument