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Airborne broad-beam emitter from a capacitive transducer and a cylindrical structure

Guarato, F. and Barduchi de Lima, G. and Windmill, J.F.C. and Gachagan, A. (2016) Airborne broad-beam emitter from a capacitive transducer and a cylindrical structure. In: 2016 IEEE International Ultrasonics Symposium (IUS). IEEE, Piscataway. ISBN 9781467398985

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Beamwidth broadening of an ultrasonic air-coupled transducer is performed by an emitter constituted of an electrostatic transducer and of a cylinder with an opening at the top covering the surface of the transducer. The acoustic emission is thus forced through a hole smaller than the diameter of the transducer’s surface. In particular, a cylinder with an upper diameter of 10mm and a height of 5mm ensures the beam pattern of the final emitter is broad across a wide frequency range. Sound attenuation is reduced and lobes in the transducer’s beam pattern are cancelled. Beam broadening can improve range estimation techniques and ultrasonic sonar as a wider area can be inspected with one emission with no need for scanning.