Improved piezoelectric transducers for acoustic emission signal reception

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Abstract
Faithful transduction of the surface displacement due to acoustic emission (AE) is essential to the success of recognizing an AE source. A piezoelectric transducer has been designed and developed that has promise of being a hi-fi AE transducer. Small transducer contact area, elimination of acoustical interference associated with coherent geometries and dimensions, and removal of most of the back reflections were guiding criteria in the design. Unlike the usual commercial AE transducer this design is simple in construction having only two parts. It consists of the active element and a backing. Tests have been made using surface wave seismic-type signals associated with a point force step function. Transducer performance has been compared with the response of the line-type capacitance standard transducer used by the National Bureau of standards acoustic emission calibration. These improved piezoelectric transducers tend to have a response which increases slightly with frequency over the range of 30 kHz to 1.2 MHz with a total variation in response for this range of less than 5 dB.

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