Method for measuring ultrasonic nonlinearity generated by high-voltage pulser

Abstract

The present invention relates to a method for measuring ultrasonic nonlinearity generated by a high-voltage pulser. More specifically, the method comprises: a calibration step for transmitting and receiving an ultrasonic signal to / from an object to be inspected having a reception probe attached thereto, the calibration step being performed by a receiving unit; a harmonic measurement step for transmitting a tone burst signal to the object to be inspected having a transmission / reception probe attached thereto, and receiving a tone burst signal that has passed through the object to be inspected,the harmonic measurement step being performed by the receiving unit; a harmonic measurement step for transmitting a tone burst signal to the object to be inspected having a transmission probe attachedthereto, and receiving the transmitted tone burst signal, the harmonic measurement step being performed by a transmitting unit; a calibration step for transmitting and receiving an ultrasonic signalto / from the object to be inspected having the transmission probe attached thereto, the calibration step being performed by the transmitting unit; and a step for measuring the ultrasonic nonlinearity of the object to be inspected by comparing fundamental frequency and harmonic components measured by the receiving unit and fundamental frequency and harmonic components measured by the transmitting unit.

Description

technical field [0001] The present invention relates to a non-linear measurement method of ultrasonic waves generated by a high-voltage pulse generator, and more specifically, to a technology for accurately evaluating material properties such as strength characteristics and thermalization degree of materials using ultrasonic waves. Background technique [0002] The nonlinear elastic properties of solid materials mean that the stress acting on the molecular distance between atoms in the material exhibits physical nonlinearity. In fact, the interatomic energy of solid materials does not have harmonic characteristics, but has non-harmonic characteristics. [0003] When an ultrasonic wave having a sinusoidal waveform with a specified frequency has sufficient amplitude and propagates in a solid medium with an inharmonic characteristic, the ultrasonic wave having a fundamental incident frequency is distorted due to a local difference in phase velocity according to the nonlinear ela...

AI Technical Summary

Problems solved by technology

[0052] Usually, most researchers use a method of removing the harmonic component transmitted from the high-voltage pulse generator by installing a filter in the ultrasonic transmitting part in order to remove the nonlinearity of the transmitted signal, but it has not been possible to completely remove the transmitted signal. Harmonic components

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