Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-09-17
1992-05-19
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
2502311, 324 96, H01J 516, G01D 534
Patent
active
051151278
ABSTRACT:
A physical property of a fluid or of any optical fiber is measured using an ptical fiber interferometer. A conductive material is disposed upon the surface of a region of a light tranmitting optical fiber and the region having the conductive material is disposed in the fluid. Light energy is applied to one end of the fiber and transmitted light is received at the other end of the fiber. Electrical energy is applied to the conductive material disposed upon the surface of the fiber to heat the region of the fiber and cause a change in the optical path length of the light transmitted through the fiber. The physical property of the fluid or optical fiber is determined in accordance with the change in the optical path length or phase of the received light caused by applying the electrical energy to the conductive material. Thermal conductivity is measured using a series of short energy pulses and determining the average phase change. The flow rate of a fluid is measured by measuring the phase change and applied electrical energy upon heating the fiber to an equilibrium temperature. The conductive material is gold and it encircles the fiber. The gold may be disposed on the jacket of the fiber or the jacket may be removed before disposing the gold.
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Bobb Lloyd C.
Davis Jon P.
Samouris Arthur
White Barbara J.
Allen S.
Bechtel James B.
Nelms David C.
The United States of America as represented by the Secretary of
Tura James V.
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