Method for real-time following echo of ultrasonic thickness measuring gate

Abstract

The invention discloses a method for real-time following echo of an ultrasonic thickness measuring gate. The method comprises the following steps: confirming an interface echo tracking section by a tracking gate; measuring the sonic path distance of the interface wave in the tracking section at real time; maintaining the initial setting of the gate starting point and the gate width of the tracking grate in the whole thickness measuring process; adjusting the gate starting point according to the sonic path distance of the interface wave fed back by the tracking gate at real time and giving an echo sonic path distance in the gate by the thickness measuring gate, thereby realizing the echo following of the thickness measuring gate. According to the method provided by the invention, the problem of inaccurate thickness measurement for a steel pipe wall caused by echo swinging in the thickness measurement process is solved; the adverse effect of workpiece motion on the thickness measurement is eliminated; the following property of the thickness measuring gate of the ultrasonic thickness measuring method is increased; the accurate measurement for the steel pipe thickness in the motion process is realized; the reliability of the ultrasonic measurement for the steel pipe thickness is ensured.

Description

technical field [0001] The invention relates to the technical field of non-destructive testing, in particular to a method for real-time following echo of an ultrasonic thickness measuring gate. Background technique [0002] At present, non-destructive testing technology has been widely used in metallurgy, chemical industry, national defense, transportation and other fields in our country. In ultrasonic nondestructive testing, as the frequency of ultrasonic waves increases, the wavelength of ultrasonic waves becomes shorter, and the accuracy of ultrasonic thickness measurement increases. Ultrasonic dynamic thickness measurement requires high signal processing: on the one hand, the gap between the workpiece and the ultrasonic probe changes dynamically during thickness measurement in a moving state, and the position where the echo signal appears is oscillating; on the other hand, when the wall thickness is thin , the sound path difference between echoes is very small, and the ...

AI Technical Summary

Problems solved by technology

This requires that the thickness measuring gate that detects the echo position can follow the echo signal in real time, but the current situation is that the thickness measuring gate that detects the echo position cannot follow the echo signal in real time, resulting in the failure of the system to perform normal and correct detection

Images