Measuring and testing – Speed – velocity – or acceleration – Acceleration determination utilizing inertial element
Patent
1991-02-07
1994-06-07
Raevis, Robert
Measuring and testing
Speed, velocity, or acceleration
Acceleration determination utilizing inertial element
73653, 73657, G01P 1508
Patent
active
053179293
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.
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Endevco General Catalog; Endevco, San Juan Capistrano, Calif.; 1986;.
D. A. Brown, T. Hofler, and L. L. Garrett; "Fiber Optic Flexural Disk Microphone" Proceedings of SPIE, vol. 985, 607 Sep. 1988, pp. 172-182; Society of Photo-Optical Instrumentation Engineers; Bellingham, Wash.
D. A. Brown, T. Hofler, and S. L. Garrett; "High-Sensitivity, Fiber Optic, Flexural Disk Hydrophone with Reduced Acceleration Response"; Fiber and Integrated Optics; vol. 8, pp. 169-191, 1989.
Brown David A.
Garrett Steven L.
Hofler Thomas J.
Brock Michael
Church Stephen J.
Forrest, Jr. John L.
Raevis Robert
Sliwka Melvin J.
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