5. New Techniques and Phenomena
Ultrasonic measurements of materials are usually obtained from an electrical conversion of an acoustic signal by a transducer. ln this paper, a conventional (phase sensitive) transducer and a new phase insensitive acoustoelectric converter called an AEC are contrasted. In particular, the AEC is shown to exhibit superior characteristics for many typical experiments and appears to have many applications in the Nondestructive Evaluation (NOE) area.
Heyman, Joseph S., "A Phase Insensitive Ultrasonic Receiver" (1978). Proceedings of the ARPA/AFML Review of Progress in Quantitative NDE, September 1976–June 1977. 26.