5. Ultrasonic Transducers
Several new types of transducers are described. These include 50 - 500 MHz transducers using thin film technology and indium techniques, transducer arrays for imaging, edge-bonded transducers, and unipolar transducers.
Kino, Gordon S.; Khuri-Yakub, B. T.; Selfridge, A.; and Tuan, H., "Development of Transducers for NDE" (1980). Proceedings of the DARPA/AFML Review of Progress in Quantitative NDE, July 1978–September 1979. 17.