Phased beam transducer

Details Phased beam transducer Phased beam transducer

1997-12-16

2000-08-22

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367103, 367119, 310366, 310365, H04R 1700

Patent

active

061082759

ABSTRACT:
A phased-beam transducer is disclosed for transmitting and receiving steered acoustic beam signals that includes a sheet of piezoelectric material such as Polyvinylidene Fluoride (PVDF), a copolymer, piezo-rubber, quartz, 1-3 PZT composite, or similar transducer material. The transducer includes specially designed electrode on each side of the piezoelectric sheet. The transducer is a two channel device with a sine channel, cosine channel and a ground lead. A summing circuit is used to sum the sine and cosine channels with a 90 .degree. phase shift applied by a phase shift circuit to one of the two channels, for example, the sine channel. The transducer is designed to form a predetermined steered beam at a particular frequency. If a different sound wave frequencies are used, the transducer will form useful directional beams with different steer angles and beamwidths. Variable sector coverage is achieved by forming beams at different frequencies. The cosine and sine channels can be digitized with the 90 degree phase shift and the summing done digitally.

REFERENCES:
patent: 3905009 (1975-09-01), Hughes et al.
patent: 4268912 (1981-05-01), Congdon
patent: 4662223 (1987-05-01), Riley et al.
Huges, "Tilted directional response patterns formed by amplitude weighting and a single 90 degree shift," J. Acoust. Soc. Am., Acoustical Society of America, vol. 59 (No. 5), p. 1040-1045, (May 21, 1976).

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