Accession Number : ADA950535

Title :   Point-Contact Transducers for Ultrasonic Testing.

Descriptive Note : Technical rept.,

Corporate Author : WATERTOWN ARSENAL LABS MA

Personal Author(s) : Gericke,Otto R.

Report Date : JUN 1962

Pagination or Media Count : 17

Abstract : The feasibility of employing point-shaped ultrasonic transducers which directly amplify the detected ultrasonic signal was investigated. Two approaches were considered, one used a semiconductor point with a depletion layer at the very tip produced by a bias voltage, the other employed the variation of contact resistance with contact pressure. The latter method was explored experimentally and found suitable for the detection of ultrasonic energy. In addition, experiments are described in which high-frequency sparks were produced at the specimen surface to generate ultrasonic vibrations. (Author-PL).

Descriptors :   *Electroacoustic transducers, *Acoustic detectors, Test equipment, Ultrasonic tests, Sensitivity, Nondestructive testing

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE