Signal processing method and measurement method for precision component thickness measurement

Abstract

The present invention relates to the technical field of precision component measurement, in particular to a signal processing method and a measurement method for precision component thickness measurement; the present invention includes the following steps: A, collecting initial radio frequency signals containing multiple echoes; B, extracting its own characteristics Echo signal; C. Screen the collected initial radio frequency signal according to the fluctuation trend characteristics to obtain a similarity curve; D. Screen the collected initial radio frequency signal according to the amplitude feature to obtain the best matching curve; E. Use the expected wall thickness value to eliminate the abnormal points in the best matching curve, and obtain the calibration matching curve; F, based on the calibration matching curve, calculate the slope of the regression line by linear regression, that is, obtain the average value of the echo time difference between the two walls of the workpiece under test; through this The invented method can accurately extract high-order echo signals in a high-noise environment, improves signal period measurement precision while ensuring signal analysis speed, and improves precision part wall thickness measurement precision.

Description

Technical field: [0001] The invention relates to the technical field of precision component measurement, in particular to a signal processing method and a measurement method for precision component thickness measurement. Background technique: [0002] High-precision thin-walled components are widely used in the core components of aerospace and nuclear power fields. In practical applications, the thickness accuracy of such components is extremely high, usually on the micron level. In order to ensure the dimensional accuracy of such core components, ultrasonic thickness measurement is often used to measure the full range of high-precision components. After the ultrasonic pulse emitted by the probe passes through the surface of the object to be inspected, it is reflected back and forth between the bottom surface and the surface of the object, and gradually attenuates until it is submerged in the noise signal. The ultrasonic waves reflected back and forth are detected by the ul...

AI Technical Summary

Problems solved by technology

However, the actual measurement environment is mostly a high-noise environment. The electromagnetic noise coupled in from the detection system from the space, the noise of the factory power supply, and the crosstalk generated by the high-frequency controller will all cause interference to the collected signal, and the collected high-order echoes are easy to be submerged. But it is difficult to automatically capture, which affects the measurement accuracy of wall thickness

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