Preparatory Notes for ASNT NDT Level III Examination - Ultrasonic Testing, UT

Equipment:
The velocity measurements for modulus calculation are most commonly
made with precision thickness gages such as models 38DL PLUS and 45MG
with Single Element software, or a flaw detector with velocity measurement
capability such as the EPOCH series instruments. Pulser/receivers such as
the Model 5072PR or 5077PR can also be used with an oscilloscope or
waveform digitizer for transit time measurements.
This test also requires two transducers appropriate to the material being
tested, for pulse-echo sound velocity measurement in longitudinal and shear
modes. Commonly used transducers include an M112 or V112 broadband
longitudinal wave transducer (10 MHz) and a V156 normal incidence shear
wave transducer (5 MHz). These work well for many common metal and fired
ceramic samples. Different transducers will be required for very thick, very
thin, or highly attenuating samples. Some cases may also require use of
through transmission techniques, with pairs of transducers positioned on
opposite sides of the part. It is recommended that in all cases the user consult
Olympus for specific transducer recommendations and assistance with
instrument setup.