Optical fiber refractometer

Details Optical fiber refractometer Optical fiber refractometer

1990-07-16

1991-01-01

Lee, John D.

Optics: measuring and testing

Range or remote distance finding

With photodetection

356128, 356130, G02B 602, G01N 2141

Patent

active

049813382

ABSTRACT:
The index of refraction of a liquid is measured using an optical fiber refractometer 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: 4678267 (1987-07-01), Burns et al.
patent: 4929049 (1990-05-01), LeGoullon et al.
"Novel Refractometer Using a Tapered Optical Fiber", Kumar et al., Electrcs Letters, 6/21/84, vol. 20, #13, p. 534.

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