Method and device for ultrasonic and nondestructive detection ofelasticity of viscoelastic medium

Abstract

The invention relates to a method and a device for the ultrasonic and nondestructive detection of the elasticity of a viscoelastic medium, which belong to the technical field of nondestructive measurements. The method comprises the following steps of: using an ultrasonic probe to produce low-frequency vibration on a medium to be detected, emitting ultrasonic waves to the medium to be detected and acquiring an ultrasonic signal returned from the medium to be detected; selecting an ultrasonic signal range for calculating the elasticity of the medium to be detected; using the selected ultrasonic signal to calculate the transmission speed of an elastic wave produced by the low-frequency vibration in the medium and further calculating the medium elasticity according to the obtained transmission speed of the elastic wave. The device comprises an ultrasonic wave energy converter contact, a vibrator fixing the ultrasonic wave energy converter contact and a control device. In the method and device, motion compensation of the ultrasonic probe is not required, so that calculation time is shortened; meanwhile, position detection is carry out without a position sensor, so that the system complexity and cost are lowered.

Description

technical field [0001] The invention belongs to the technical field of non-destructive measurement, and relates to an elastic detection method and a device thereof for a viscoelastic medium that generates scattering signals after being irradiated by ultrasonic waves. Background technique [0002] The non-destructive measurement technology of viscoelastic media is of great significance in the field of food industry. If the elasticity of food can be detected conveniently, it will be able to better control the quality of food. In addition, in the medical field, various chronic liver diseases (viral hepatitis, alcoholic hepatitis, nonalcoholic steatohepatitis, and autoimmune liver disease) will lead to liver fibrosis and cirrhosis. Liver fibrosis and cirrhosis are accompanied by changes in liver elasticity. If the elasticity of the liver can be detected non-invasively, the condition of liver disease can be monitored and evaluated, so that timely and effective treatment plans ca...

AI Technical Summary

Problems solved by technology

Although this method can solve the problem of reference point movement, the compensation of movement requires additional calculation time, and at the same time, the complexity and cost of the system are increased due to the need to install a position sensor

[0005] In addition, the above-mentioned device relies on manual operation, and the pressure exerted by the ultrasonic probe on the medium and whether the probe is perpendicular to the medium will affect the measurement results during operation.

In actual operation, the operator needs to judge whether the applied pressure and the perpendicularity between the ultrasonic contactor and the medium are appropriate based on experience, which makes the test results easily affected by the subjective factors of the operator, which may lead to the measurement under the operation of different operators or the same The results of different operations of the operator are quite different

[0006] In addition, the above devices usually require multiple repeated measurements of the same location to obtain the final result

Since the operator measures with a hand-held probe, it is difficult to ensure that each measurement is at the same position, and the deviation of this measurement position will also affect the accuracy of the results

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