Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1980-11-24
1984-02-21
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367165, 367170, 310800, H04R 1700
Patent
active
044334001
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: 2636134 (1953-04-01), Arons et al.
patent: 2822481 (1958-02-01), Schiller
patent: 3090030 (1963-05-01), Schuck
patent: 3287692 (1966-11-01), Turner
patent: 3484679 (1969-12-01), Hodgson et al.
patent: 3535686 (1970-10-01), Barnett
patent: 3562451 (1971-02-01), Mullen, Jr. et al.
patent: 3903733 (1975-09-01), Murayama et al.
patent: 3935485 (1976-01-01), Yoshida
patent: 3940974 (1976-03-01), Taylor
patent: 3995763 (1976-12-01), Ayres et al.
patent: 4013992 (1977-03-01), Dewberry et al.
patent: 4056742 (1977-11-01), Tibbetts
patent: 4204135 (1980-05-01), Murayama
"Piezoelectric Polymer Hydrophone Development," Harris and DeReggi, Paper No. 1719, Proceedings of 25th Annual Meeting of the American Institute of Ultrasound in Medicine, New Orleans, Sep. 15-19, 1980.
Underwater Acoustic Measurements on Polyvinylidene Fluoride Transducer" by Woodward et al., Electrocomponent Science and Technology, (1978), vol. 5, pp. 149-157.
Electromotional Device Using PVF.sub.2 Multilayer Dimorph by Toda 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.
LandOfFree
Acoustically transparent hydrophone probe does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Acoustically transparent hydrophone probe, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Acoustically transparent hydrophone probe will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1039292