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    • Optical Spectral Reflectance Sensor and Controller 

      Stone, Marvin L.; Needham, Duane; Solie, John B.; Raun, William Robert; Johnson, Gordon V.; Board of Regents/Oklahoma State University and the A & M Colleges (U.S. Patent and Trademark Office, 2005-02-15)
      A spectral reflectance sensor including: a light source for emitting a modulated beam of red light; a light source for emitting a modulated beam of near infrared light; a receiver for receiving reflected light produced by ...