Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1985-10-23
1987-08-18
LaRoche, Eugene R.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
73705, G01L 900
Patent
active
046879277
ABSTRACT:
A pressure measuring system wherein light is transmitted from a light source via a first optical fiber to a pressure-receiving diaphragm having a reflecting surface which undergoes a deflection in relation to the pressure being measured. The diaphragm reflects light transmitted thereto to a second optical fiber which transmits the reflected light to a first photosensitive element. A reference optical fiber is arranged approximately coextensive to the first and second optical fibers and transmits light from the light source in round trip fashion along substantially the same path as light transmitted by the first and second optical fibers to a second photosensitive element. The photosensitive elements produce respective electrical signals which are applied to an operational circuit which eliminates variations in the amount of light due to external disturbances by dividing one electrical signal by the other. With such a construction, it is possible to have a pressure measuring system which is unaffected by electromagnetic induction accompanying large currents and high voltages, which enables more accurate and more sensitive pressure measurements.
REFERENCES:
patent: 4487206 (1984-12-01), Aagard
"The Institute of Electrical Engineers of Japan Tokyo Branch Meeting" Paper No: 171; Ohasi et al.; 1981; p. 221.
NASA TMX-3571, "Optical Zero-Differential Pressure Switch and Its Evaluation in Multiple-Pressure Measuring System" J. A. Powell; 1977.
Ishimura Takiji
Iwamoto Katsuharu
Kawakami Osamu
Miyagawa Hideo
Tashiro Ikuo
Kabushiki Kaisha Toshiba
LaRoche Eugene R.
Mottola Steven J.
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