Accession Number : ADD007651

Title :   High Accuracy Optical Shaft Encoder System.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Terrell,Mark C

Report Date : 23 Sep 1980

Pagination or Media Count : 4

Abstract : An optical shaft encoder system for measuring electrically powered motor shaft speed, including a system for increasing the sinosoidal encoder output waveforms by a multiplication factor, converting the product of the multiplied waveforms to square waves, comparing the waveforms to a reference waveform and generating a correction signal which is fed back to the motor through servo circuitry, thereby correcting errors in motor shaft rotational speed. (Author)

Descriptors :   *Patents, *Speed regulators, *Optical detectors, *Electric motors, Control systems, Shafts(Machine elements), Angular motion, Error analysis, Corrections, Feedback, Waveforms, Comparators

Subject Categories : Electrical and Electronic Equipment
      Mfg & Industrial Eng & Control of Product Sys
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE