With Portions Of Light Guide Coating Or Cladding Removed Patents (Class 250/907)
  • Fiber optic evanescent wave fuel gauge and leak detector using eccentric core fibers
    Patent number: 5291032
    Abstract: An optical fiber evanescent wave fuel sensor, employing a light source with a wavelength selected to be at the strong infrared absorption lines of the fuel, typically hydrocarbons. The amount of light leaking from the optical fiber is an exponential function of the length of the fiber in the liquid, and is independent of the relative indices of refraction of the fuel and fiber cladding material.
    Type: Grant
    Filed: May 11, 1993
    Date of Patent: March 1, 1994
    Assignee: Hughes Aircraft Company
    Inventors: Victor Vali, David B. Chang, I-Fu Shih, Albert F. Lawrence