The Response of an Air-Coupled Ultrasonic Transducer for Various Backplates and Apertures
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Begun in 1973, the Review of Progress in Quantitative Nondestructive Evaluation (QNDE) is the premier international NDE meeting designed to provide an interface between research and early engineering through the presentation of current ideas and results focused on facilitating a rapid transfer to engineering development.
This site provides free, public access to papers presented at the annual QNDE conference between 1983 and 1999, and abstracts for papers presented at the conference since 2001.
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Abstract
Development of air-coupled capacitance ultrasonic transducers that operate above 100kHz have recently been of interest. The main applications for these devices include the location and imaging of objects, and in the nondestructive evaluation of engineering materials. To control the response of either as a source or a receiver, we needed to investigate the effect of using different backplate materials and manufacturing techniques. Backplates were produced in a range of materials such as silicon, copper and stainless steel. Various techniques of micromachining such as chemical etching, laser machining and ion beam machining were used.