Patent ID: 6965709
Filing Date: 2005-11-15
Classification: G01D,G01F,G01J

Abstract:
1. A fluorescent optical position sensor, comprising: a fluorescent optical waveguide comprising a uniform concentration of fluorescent material along the waveguide's length; means for generating a non-uniform distribution of fluorescent light inside of the waveguide; photodetector means for measuring fluorescent light emitted from the waveguide; wherein said photodetector means comprises a first photodetector disposed for measuring a first intensity of light, S processing means, in operative association with the first and second photodetectors, for calculating the location, X, of a position along the waveguide, based on the ratio, S where: wherein said first and second photodetectors are remotely located and are coupled to the ends of the fluorescent waveguide via first and second low-loss optical fibers, respectively; and further wherein an excitation means for exciting a localized region of fluorescence inside of the waveguide at an unknown position, X, comprises the proximal end of a third low-loss optical fiber held in close proximity by a support to said waveguide and oriented to illuminate the waveguide from the side; and wherein the distal end of the third optical fiber is coupled to a remotely-located excitation light source.