Optical Fiber Refractometer

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...

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Bibliographic Details
Main Authors: Bobb, Lloyd C, Krumboltz, Howard D
Format: Report
Language:English
Subjects:
ANGLES
FIBER OPTICS
Fiber Optics and Integrated Optics
FIBERS
LAUNCHING
LIGHT
LIGHT SOURCES
LIGHT TRANSMISSION
Optical Detection and Detectors
Patent applications
REFRACTION
REFRACTIVE INDEX
REFRACTOMETERS
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Description
Summary: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 reflective end of the optical fiber and the light source for providing single-ended operation.