Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-03-20
1990-09-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25023110, G01D 534, H01J 516, G01B 902
Patent
active
049595393
ABSTRACT:
A hydrophone or other acoustic vibration sensing apparatus having a disk circumferentially supported for flexure induced by acoustic vibrations and wound on each side with a flat spiral of optical fiber fixedly attached to the disk side so that flexure of the disk due to the vibrations lengthens the spiral on one side and shortens the spiral on the other side. The spirals are connected as two legs of a fiber optic interferometer to provide an output corresponding to the vibrations while canceling errors due to pressure and temperature effects common to the legs. A pair of the disks and associated optical fiber spirals may be mounted on opposite ends of a body with the outer spirals connected as one interferometer leg and the inner spirals as another leg to cancel differences in the lengths of the legs due to acceleration induced flexure of the disks and to provide double the sensitivity to pressure differential of a single disk.
REFERENCES:
patent: 4162397 (1979-07-01), Bucaro et al.
patent: 4534222 (1985-08-01), Finch et al.
patent: 4564289 (1986-01-01), Spillman, Jr.
patent: 4577100 (1986-03-01), Meltz et al.
patent: 4588886 (1986-05-01), Snider
patent: 4613752 (1986-09-01), Davis
patent: 4799202 (1989-01-01), Assard
patent: 4799752 (1989-01-01), Carome
T. D. Sullivan and J. M. Powers, "Piezoelectric Polymer Flexural Disk Hydhone", Journal Acoustic Society of America; vol. 63, No. 5, May 1978, pp. 1396-1401.
D. Ricketts, "Model for a Piezoelectric Polymer Flexural Plate Hydrophone", Journal Acoustic Society of America; vol. 70, No. 4, Oct. 1981, pp. 929-935.
Garrett Steven L.
Hofler Thomas J.
Church Stephen J.
Messinger Michael
Nelms David C.
Sheinbein Sol
Sliwka Melvin J.
LandOfFree
Flexural disk fiber optic hydrophone does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Flexural disk fiber optic hydrophone, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Flexural disk fiber optic hydrophone will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-330286