Accession Number : ADD017369

Title :   Fiber Optic Accelerometer With Centrally Supported Flexural Disk.

Descriptive Note : Patent, Filed 9 Dec 93. patented 29 Nov 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Hofler, Thomas J ; Brown, David A ; Garrett, Steven L

Report Date : 29 Nov 1994

Pagination or Media Count : 8

Abstract : An accelerometer or seismometer has an elastic disk bearing a mass distributed peripherally around the disk. The disk is supported for flexure and for isolation from mounting strain by a stob centrally through the disk. The accelerometer or seismometer has a pair of flat spirals of optical fiber, each spiral being fixedly attached to a corresponding disk side so that disk flexure lengthens a spiral on one disk side and shortens a spiral on an oppositely facing disk side and so that temperature differences between the spirals are minimized. The pair of spirals are connected as legs of a fiber optic interferometer so that the interferometer provides an output corresponding to the flexure. Several of the disks and associated pairs of spirals may be coaxially mounted to provide increased sensitivity.

Descriptors :   *FIBER OPTICS, *ACCELEROMETERS, *PATENTS, ELASTIC PROPERTIES, ISOLATION, DISKS, FLEXURAL PROPERTIES, INTERFEROMETERS, CURVES(GEOMETRY), SEISMOMETERS

Subject Categories : Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE