Transducer in ultrasonic test is used to generate wave, sends sound pressureto a material and receives wave, which travels and/or returns by reflection.There is few reports that output waveform from a flaw detector is not thesame that of the ultrasonic visualization system. The deformation was causedat the convert from sound pressure to electric voltage and characteristic ofamplifier. In this paper simulation of voltage waveform converted from soundpressure which will be received by a transducer in ultrasonic tester arestudied.We confirmed that the result of simulation is similar to the waveformactually received by the receiver. Oppositely, inverse calculation fromreceived voltage form to find the mean waveform of pressure to be expectedmade a good agreement to waveform visualized.We can appear again the original waveform of sound pressure from receivedvoltage waveform of flaw detector. It lead to a many applications and exactinterpretation of phenomenon, for example, measurement of the slope ofreflector and large reflection echo which appear at the shortest path andtwo small echo with negative phase at the path from reflector, whenreflector is near the large transducer.
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