Wireless passive piezoelectric ultrasonic thickness measurement method and ultrasonic thickness measurement system thereof

Abstract

This invention belongs to the field of oil and gas pipeline inspection technology, and particularly relates to a wireless passive piezoelectric ultrasonic thickness measurement method and its ultrasonic thickness measurement system. This thickness measurement method, while ensuring relay coupling efficiency, cancels signal crosstalk caused by direct coupling between the excitation coil and the receiving coil through reverse-phase winding of the sub-coil, effectively improving the detection accuracy and result stability of oil and gas pipeline wall thickness. The thickness measurement method includes: determining the structural configuration of the wireless passive piezoelectric ultrasonic thickness measurement system; performing decoupling operations on the excitation coil and the receiving coil; determining the spatial arrangement and magnetic field distribution characteristics of the excitation coil and the receiving coil, and calculating the relay coupling region and structural parameters of the detection coil; determining the coupling parameters of the linear frequency modulated chirp signal used in the excitation process of the excitation coil, and generating the linear frequency modulated chirp signal; receiving the ultrasonic echo signal transmitted back by the detection coil, and performing pulse compression processing on the ultrasonic echo signal.

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