Membrane hydrophone having inner and outer membranes

Details Membrane hydrophone having inner and outer membranes Membrane hydrophone having inner and outer membranes

1993-04-16

1994-08-16

Lobo, Ian J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

310324, 310800, H04R 1700

Patent

active

053392906

ABSTRACT:
An acoustic device, such as a membrane hydrophone, includes a support structure and an outer membrane that suspends a transducer membrane within the interior of the support structure. The transducer membrane is selected for its acoustic and piezoelectric properties and is preferably a polymer such as P(VDF-TrFE). The outer suspension membrane is selected primarily for its mechanical properties. Portions of the suspension membrane may be removed in order to reduce mechanical drag encountered during movement of the device in a liquid. The transducer membrane includes at least one active area that is poled to provide a piezoelectrically strong region. Electrical charge generated at the active area is amplified at a preamp for transmission to remote equipment.

REFERENCES:
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patent: 4653036 (1987-03-01), Harris et al.
patent: 4789971 (1988-12-01), Powers et al.
patent: 5035247 (1991-07-01), Heimann
patent: 5072426 (1991-11-01), Schafer et al.
Brendel, Klaus et al., "Hydrophone Measurements," Ch. 5, Part A, Ultrasonic Exposimetry, Ed. Marvin C. Ziskin et al., CRC Press, pp. 116-125.
DeReggi, A. S. et al., "Piezoelectric polymer probe for ultrasonic applications," J. Acoust. Soc. Am., vol. 69, No. 3, Mar. 1981, pp. 853-859.
Preston, R. C. et al., "PVDF membrane hydrophone performance properties and their relevance to the measurement of the acoustic output of medical ultrasonic equipment," J. Phys. E: Sci. Instrum., vol. 16, 1983, pp. 786-796.
Shottow et al., "A PVDF membrane hydrophone for operation in the range of 0.5 MHz to 15 MHz," Ultrasonics, May 1980, pp. 123-126.

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