Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1992-09-01
1993-06-01
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
25022721, 25023119, H01J 516
Patent
active
052162400
ABSTRACT:
The present invention relates to a sensor comprising an optical fibre (2), a light source (1) for passing light through the fibre (2), a plurality of sets of actuating means (3), each set having one or more actuation means (3) connecting the fibre (2) to a respective device to be monitored, each actuation means (3) within a set having a stored vibrational energy which is released to modulate the light in the optical fibre (2) when a parameter of the device to which it is connected changes by a predetermined amount and means (4,5,6 and 7) for converting the optical signal into an electrical signal wherein each set of actuation means (3) has a different natural vibrational frequency thus enabling the sensor to detect from which device the vibration originated by monitoring the change in transmitted light.
REFERENCES:
patent: 4071753 (1978-01-01), Fulenwider et al.
patent: 4359637 (1982-11-01), Perren
patent: 4778248 (1988-10-01), Arzur et al.
patent: 5072113 (1991-12-01), Martinelli et al.
patent: 5126558 (1992-06-01), Rogers, Jr. et al.
Focus Limited
Le Que T.
Nelms David C.
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