Piezoelectric Transducer for Air-Borne Ultrasound
In a previous work [1] a study was made of a particular type of flexurally vibrating plate with stepped surface which showed very good directional characteristics for ultrasonic radiation. The stepped shape of these plates resulted by shifting the thickness of the zones which were vibrating
in phase (with respect to those in counter-phase) by half a wavelength of the sound in the propagation medium. This made coherent the radiation in the far field.
Using these plates we have performed experiments on the design and performance of transducers for generating intense, high-directional ultrasound in air.
The transducers here examined have been constructed of a piezoelectric ceramic in a sandwich arrangement, a tapered rod which acts as a sonic amplitude transformer and a stepped circular plate; they operate at a frequency of about 21 kHz.
Using these plates we have performed experiments on the design and performance of transducers for generating intense, high-directional ultrasound in air.
The transducers here examined have been constructed of a piezoelectric ceramic in a sandwich arrangement, a tapered rod which acts as a sonic amplitude transformer and a stepped circular plate; they operate at a frequency of about 21 kHz.
Document Type: Research Article
Publication date: 01 October 1973
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