Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1982-03-24
1985-06-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350 9629, 73655, G02B 514
Patent
active
045256268
ABSTRACT:
Dynamic behavior of structures subject to vibrations is monitored with light coupled into a single multi-mode optical fiber positioned within or on the structure. Vibration caused strain or deflections in the structure are detected by interference light signal intensity variations caused by differential phase changes in the transmission modes. These intensity variations are optically detected to provide an electrical output. Actuators may be positioned at the vibration nodes of the structure and energized by signals derived from the electrical output signals to suppress the vibrations.
REFERENCES:
patent: 4162397 (1979-07-01), Bucaro et al.
patent: 4339661 (1982-07-01), Pitt et al.
patent: 4408495 (1981-10-01), Couch et al.
Research Update on Fiber Optics, J. H. Cole et al., Intl. Fiber Op. and Comm., vol. 2, No. 2, Mar. 1981, pp. 23-25.
Kush Stephen T.
Meffe Marc E.
Austin II Ernest
Levine Seymour
Nelms David C.
Sperry Corporation
Terry Howard P.
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