Accession Number : ADD014841

Title :   Optical Fiber Refractometer Launching Light at a Non-Zero Launch Angle.

Descriptive Note : Patent, Filed 3 Jan 90, patented 29 Jan 91,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Bobb, Lloyd C ; Krumboltz, Howard D

Report Date : 29 Jan 1991

Pagination or Media Count : 10

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.

Descriptors :   ANGLES, FIBER OPTICS, FIBERS, LAUNCHING, LIGHT, LIGHT SOURCES, LIGHT TRANSMISSION, REFRACTION, REFRACTIVE INDEX, REFRACTOMETERS

Subject Categories : Optical Detection and Detectors
      Fiber Optics and Integrated Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE