Ultrasonic thickness measurement method for multiple medium layers

Abstract

Provided is an ultrasonic thickness measurement method for multiple medium layers. The thickness measurement method is carried out through ultrasonic probes. The ultrasonic probes comprise an ultrasonic transmitting angle probe and an ultrasonic receiving angle probe. The thickness measurement method carried out through the ultrasonic angle probes comprises the steps of enabling the ultrasonic transmitting angle probe to adhere to the surface of a medium on the uppermost layer of a plurality of layers of mediums through a coupling agent so as to transmit ultrasonic waves into the mediums; enabling the ultrasonic receiving angle probe and the ultrasonic transmitting angle probe to be placed in the same plane, scanning along a direction far away from the ultrasonic transmitting angle probe from the nearest position of the ultrasonic transmitting angle probe, obtaining time of every return point, and working out the thickness of every medium layer according to a thickness calculation formula. On some special sites, online detection can be finished without influencing normal production, and detection cost is also reduced while detection time is shortened.

Description

technical field [0001] The invention relates to a thickness measurement method in the field of non-destructive testing, in particular to an ultrasonic thickness measurement method for multi-media layers. Background technique [0002] Ultrasonic thickness measurement technology is an important part of the non-destructive testing technology field, widely used in petroleum, chemical industry, metallurgy, aviation, aerospace and other fields. The existing ultrasonic thickness measurement method at home and abroad is based on the principle of ultrasonic pulse reflection to measure the thickness. The ultrasonic wave emitted by the ultrasonic probe enters the measured object through the coupling agent, and is reflected after it propagates to the bottom surface in the measured object. The reflected ultrasonic wave is Received by the ultrasonic probe, measured the echo time T from the start of the emission to the bottom surface of the workpiece, according to the propagation speed c o...

AI Technical Summary

Problems solved by technology

[0003] The above method of thickness measurement uses a straight ultrasonic probe. Most of the ultrasonic waves emitted by the straight probe are reflected on the bottom surface of the medium, while a small part can be transmitted into the lower medium. In this way, when measuring the thickness of each medium layer below the second layer, the It is not easy to obtain the reflection echo from the bottom surface of each medium layer, and it is impossible to measure the thickness of multi-layer medium. Therefore, straight probe measurement is more used to measure the thickness of single-layer medium in practical applications.

Images