Airborne broad-beam emitter from a capacitive transducer and a cylindrical structure
| Autor: | James F. C. Windmill, G. Barduchi de Lima, Anthony Gachagan, Francesco Guarato |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
0209 industrial biotechnology
Materials science TK Acoustics Ultrasonic testing 02 engineering and technology 021001 nanoscience & nanotechnology Beamwidth 020901 industrial engineering & automation Transducer Computer Science::Sound Physics::Accelerator Physics Cylinder Ultrasonic sensor 0210 nano-technology Electromagnetic acoustic transducer Beam (structure) Common emitter |
| Zdroj: | 2016 IEEE International Ultrasonics Symposium (IUS). |
| DOI: | 10.1109/ultsym.2016.7728416 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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