Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1990-01-03
1991-01-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
356133, H01J 516
Patent
active
049888633
ABSTRACT:
The index of refraction of a liquid is measured using an optical fiber rectometer having a light transmitting optical fiber by immersing a portion of the optical fiber in the liquid and launching light into one end of the optical fiber at a selected non-zero launch angle with respect to the fiber axis. Light transmitted through the optical fiber is detected at the other end of the optical fiber and a determination is made of the index of refraction of the liquid in accordance with the detected light and the selected non-zero launch angle. By varying the launching angles of the light the range of the refractometer is increased. The light transmitting optical fiber is provided with a region having at least one tapered portion for further increasing the range of the refractometer. The tapered portion of the optical fiber is disposed between a refractive end of the optical fiber and the light source for providing single-ended operation.
REFERENCES:
patent: 3520619 (1970-07-01), Ward
patent: 4564292 (1986-01-01), Omet
patent: 4711126 (1987-12-01), Houpt et al.
Bobb Lloyd C.
Krumboltz Howard D.
Allen Stephone B.
Bechtel James B.
Nelms David C.
The United States of America as represented by the Secretary of
Tura James V.
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