Development of an air-coupled ultrasonic sensor for high-pressure and temperature applications

Jared S. Sandman; Bernhard R. Tittmann

doi:10.1117/12.385501

13 May 2000 Development of an air-coupled ultrasonic sensor for high-pressure and temperature applications

Jared S. Sandman, Bernhard R. Tittmann

Proceedings Volume 3993, Nondestructive Evaluation of Aging Materials and Composites IV; (2000) https://doi.org/10.1117/12.385501
Event: SPIE's 5th Annual International Symposium on Nondestructive Evaluation and Health Monitoring of Aging Infrastructure, 2000, Newport Beach, CA, United States

Abstract

The focus of this investigation is to develop an Ultrasonic Position Indication System (UPIS) that is capable of determining one-dimensional target location in a steel- contained pressurized gaseous medium. The combination of the very high acoustical impedance of steel (45.4 MRay1) and the very low impedance of air (0.0004MRay1) causes extremely high- energy losses upon transmission. In addition to the energy loss, propagation through a steel plate produces many internal reflections in the plate. The strategy of this investigation is to develop a self-contained ultrasonic transducer that is capable of replacing a small portion of a high temperature- pressure boundary. In building such a transducer, sufficient acoustic matching layers for the steel-gas interface, a mechanically and acoustically competent housing, a sufficient piezoelectric element, and backing materials are all developed and tested. The results include a successful housing design, high-temperature acoustic matching layers, and subsequent successful waveforms. Target location through 9.6'(24.5 cm) of ambient air was successful, with a steel pressure boundary 0.4566' (1.1598 cm) thick, and using one matching layer.

Citation Download Citation

Jared S. Sandman and Bernhard R. Tittmann "Development of an air-coupled ultrasonic sensor for high-pressure and temperature applications", Proc. SPIE 3993, Nondestructive Evaluation of Aging Materials and Composites IV, (13 May 2000); https://doi.org/10.1117/12.385501

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