High-resolution encoder using double gratings

Details High-resolution encoder using double gratings High-resolution encoder using double gratings

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2577..138k&link_type=abstract

Proc. SPIE Vol. 2577, p. 138-145, International Conference on Applications of Optical Holography, Toshio Honda; Ed.

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We propose a new signal detection method for optical encoders. Two diffraction gratings whose periods are slightly different from eachother are irradiated by a collimated beam to make an interference fringe. This encoder system has a simple structure while the performance is not influenced by the wavelength change, theoretically. A quasi sine curve of period 0.5 micrometers was detected by a fundamental experiment.

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