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Side-emitting fiber optic position sensor

United States Patent

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February 12, 2008
View the Complete Patent at the US Patent & Trademark Office
Fiber-Optic Long-Line Position Sensor
A side-emitting fiber optic position sensor and method of determining an unknown position of an object by using the sensor. In one embodiment, a concentrated beam of light source illuminates the side of a side-emitting fiber optic at an unknown axial position along the fiber's length. Some of this side-illuminated light is in-scattered into the fiber and captured. As the captured light is guided down the fiber, its intensity decreases due to loss from side-emission away from the fiber and from bulk absorption within the fiber. By measuring the intensity of light emitted from one (or both) ends of the fiber with a photodetector(s), the axial position of the light source is determined by comparing the photodetector's signal to a calibrated response curve, look-up table, or by using a mathematical model. Alternatively, the side-emitting fiber is illuminated at one end, while a photodetector measures the intensity of light emitted from the side of the fiber, at an unknown position. As the photodetector moves further away from the illuminated end, the detector's signal strength decreases due to loss from side-emission and/or bulk absorption. As before, the detector's signal is correlated to a unique position along the fiber.
Weiss; Jonathan D. (Albuquerque, NM)
Sandia Corporation (Albuquerque, NM)
March 24, 2006
250/227.11 ; 385/12;
G01J 1/04 (20060101); G01J 1/42 (20060101); G01J 5/08 (20060101); G02B 6/00 (20060101);
250/227.11,483.1,484.2,485.1,361R 356/73.1,614,615,622 385/12-14
FEDERALLY SPONSORED RESEARCH The U.S. Government has rights in this invention pursuant to Department of Energy Contract No. DE-AC04-94AL85000 with Sandia Corporation.