Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-04-28
1994-08-16
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022719, 73800, H01J 4014
Patent
active
053389280
ABSTRACT:
Vibrations within ceramic matrix and metal matrix composite materials are controlled by applying an excitation voltage to an array of piezoelectric actuators mounted to the surface of such materials. The actuators are driven in response to the phase shift of monochromatic light transmitted through a grid of optical fibers embedded within the composite materials. Applications include active vibration suppression, de-icing, and on-line structural integrity monitoring.
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"Fiber Optic Sensor Technology-An Opportunity for Smart Aerospace Structures" by J. S. Heyman and R. S. Rogowski, NANA Langley Research Center, Hampton, Va. and R. O. Claus, Virginia Polytechnic Institute and State University, Blacksburg, Va. dated Sep. 7-9, 1988, AIAA/NASA/AFWAL Conference on Sensors and Measurements, Techniques for Aeronautical Applications, 6 pages.
"Piezoelectric Actuators for Distributed Vibration Excitation of Thin Plates" by E. K. Dimitriadis, C. R. Fuller and C. A. Rogers, vol. 113, Jan. 1991, Journal of Vibration and Acoustics, pp. 100-107.
Jamieson James R.
Stegemiller Heidi J.
Zahedi Ahmad P.
General Electric Company
Herkamp Nathan D.
Le Que T.
Nelms David C.
Squillaro Jerome C.
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