The performance of thick piezoelectric transducers as wide-band ultrasonic detectors |
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| Authors: | R.J. Dewhurst D.A. Hutchins S.B. Palmer C.B. Scruby |
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| Affiliation: | 1. Department of Applied Physics, University of Hull, Hull, HU6 7RX, UK;2. Department of Physics, Queens University, Kingston, Ontario, Canada;3. Materials Physics Division, AERE, Harwell, Didcot, Oxfordshire, OX11 0RA, UK |
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| Abstract: | A Q-switched Nd:YAG laser has been used to generate reproducible acoustic displacements in metallic samples. The acoustic waveforms were initially detected by an absolute displacement-sensitive, capacitance transducer. The capacitance transducer was then replaced in turn by two piezoelectric ceramic transducers of different thickness and diameter. Comparison of waveforms from the two types of detector indicate that thick piezoelectric transducers are useful in the detection of fast rise-time displacement waveforms at metal surfaces. Their performance is optimized by making them as thick as possible, with a small area of contact with the surface. |
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| Keywords: | ultrasonics piezoelectric transducers metal surfaces |
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