Accession Number : ADD016444

Title :   Fiber Optic Flexural Disk Accelerometer.

Descriptive Note : Patent, Filed 7 Feb 91, patented 7 Jun 94,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

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

Report Date : 07 Jun 1994

Pagination or Media Count : 10

Abstract : An accelerometer or seismometer has a pair of flat spirals of optical fiber and has one or more elastic disks bearing a mass and supported for flexure. Each spiral is 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, the spirals being connected as legs of a fiber optic interferometer so that the interferometer provides an output corresponding to the flexure. A pair of the disks may be mounted oppositely of a sealed body with a pair of the spirals arranged to minimize the effect of pressure changes on the sensor, and a pair of the spirals may be mounted oppositely of a thermally conducting disk to minimize temperature differences between the spirals. The mass may be centrally mounted on a disk with the disk peripherally supported, or the mass may be distributed around the disk periphery with the disk centrally supported for isolation from mounting strain. Several of the disks may be coaxially mounted to provide increased sensitivity.

Descriptors :   *ACCELEROMETERS, *FIBER OPTICS, *PATENTS, *OPTICAL DETECTORS, BEARINGS, BODIES, BOUNDARIES, DISKS, FACINGS, FIBERS, INTERFEROMETERS, ISOLATION, LEGS, MASS, OPTICS, OUTPUT, PRESSURE, SEISMOMETERS, SENSITIVITY, TEMPERATURE, OPTICAL INTERFEROMETERS, FLEXURAL PROPERTIES, STRAIN(MECHANICS)

Subject Categories : Fiber Optics and Integrated Optics
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE