The absolute zero point method to improve the positional accuracy for PDS microdensitometer coordinate system - hardware.

Details The absolute zero point method to improve the positional accuracy for PDS microdensitometer coordinate system - hardware. The absolute zero point method to improve the positional accuracy for PDS microdensitometer coordinate system - hardware.

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ppmto..12..197f&link_type=abstract

Publ. Purple Mt. Obs., Vol. 12, No. 3, p. 197 - 204

Mathematics

Logic

Microdensitometers: Methods Of Reduction

Scientific paper

The logic circuit design of the absolute zero signal for PDS coordinate
system is introduced. The key point is to make use of the phase relation
between the zero signal and B-phase signal on the linear optical
encoder. A logic circuit is designed to extract the absolute zero signal
with a high repeatability of less than 1 μm.

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