Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1983-11-17
1985-05-14
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367155, 367165, 367170, 310800, H04R 1700
Patent
active
045176655
ABSTRACT:
An acoustically transparent hydrophone probe consisting of a rigid hoop structure in which is secured an assembly of very thin piezoelectric polymer sheet material, such as polyvinylidene fluoride, with one or more very small central sensitive portions. In its simplest form it consists of a single sheet with a small central poled piezoelectric area and with very thin metallic electrodes deposited on the sheet on opposite sides of the piezoelectric area and having fine conductive leads extending from the electrodes and adapted to be connected to a suitable amplifier or transmission line. The sheet is of biaxially stretched material, and is held taut in the hoop structure. Other embodiments may employ multiple sheets. With two sheets, the outermost surfaces are metallized and are at common ground potential, and the inner surfaces have superimposed deposited metallic electrodes with poled piezoelectric areas adjacent thereto. The electrodes have superimposed deposited metallic leads which have a common electrical connection to a transmission line or to an amplifier. With four sheets, the two innermost sheets form a bilaminate subassembly similar to the 2-sheet embodiment. The outer sheets have metallized outer surfaces which are grounded. Between said outer sheets and the bilaminate subassembly, guard rings coaxial with the piezoelectric active areas are provided. The guard rings can be driven electrically in a manner to eliminate the effects of the capacitance of the electrical leads.
REFERENCES:
patent: 2724818 (1955-11-01), Camp
patent: 3090030 (1963-05-01), Schuck
patent: 3903733 (1975-09-01), Murayama et al.
patent: 3935485 (1976-01-01), Yoshida et al.
patent: 3940974 (1976-03-01), Taylor
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patent: 4204135 (1980-05-01), Murayama
patent: 4315433 (1982-02-01), Edelman et al.
"Polymeric Ultrasonic Probe" by DeReggi et al., J. Acoust. Soc. of Am., vol. 64, Supp. No. 1, Fall 78, pp. 555 and 556, Abstract U8.
"A PVDF Membrane Hydrophone for Operation in the Range of 0.5 MHz to 15 MHz" by Shotton et al., Ultrasonics, May 1980.
Electromotional Device Using PVF.sub.2 Multilayer Bimorph by Todal et al., IECE of Japan, vol. E. 61, No. 7, Jul. 1978, pp. 507-512.
DeReggi Aime S.
Harris Gerald R.
The United States of America as represented by the Department of
Tudor Harold J.
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