Ultrasonic Test Equipment and Evaluation Method Thereof

A method for evaluating a test result by an ultrasonic test equipment, comprising the steps of:

• transmitting an ultrasonic wave having a low frequency lower than a predetermined frequency to an object to be tested;
• receiving an ultrasonic response from the object to be tested by an ultrasonic receiving mechanism;
• converting the received analog ultrasonic waveform to a digital ultrasonic waveform;
• performing frequency analysis of the converted digital ultrasonic waveform by an analyzing mechanism;
• and
• extracting a variation of a nonlinear ultrasonic component from frequency information of the digital ultrasonic waveform of the object to be tested obtained by the frequency analysis, matching the variation with known defect data information in a defect information database, identifying a physical quantity of defect information of the object to be tested, and then, evaluating a defect in the object to be tested by an evaluating mechanism.

An ultrasonic test equipment comprising:

• a signal generating mechanism that generates a voltage waveform;
• an ultrasonic transmitting mechanism that excites ultrasonic vibrations having a lower frequency than a predetermined frequency to an object to be tested;
• an ultrasonic receiving mechanism that receives an ultrasonic response from the object to be detected;
• an AD converting mechanism that digitizes the received ultrasonic waveform;
• a calculating mechanism that performs an inverse problem calculation of a spatial intensity distribution from the digitized ultrasonic waveform;
• a filtering mechanism that calculates the spatial intensity distribution filtered by any frequency component;
• a variation extracting mechanism that extracts an intensity variation of a nonlinear ultrasonic component;
• a display mechanism that displays at least the filtered spatial intensity distribution from the filtering mechanism;
• and
• a control mechanism that partly or entirely controls a measurement system.