Digital tracking system with analog signal resolution

Details Digital tracking system with analog signal resolution Digital tracking system with analog signal resolution

1977-12-27

1979-05-01

Thesz, Joseph M.

Registers

Platform operated

Platform actuated traffic counters

177DIG6, 235 92WT, 235 92PS, 235 92R, 250237G, G01G 300, H03K 2102

Patent

active

041525795

ABSTRACT:
An optical detector provides an optically amplified function of displacement to be measured. The detector includes a first optical grating which moves with a displaceable member, while a second reticle grating is positioned in a plurality of phase displaced zones which remain fixed. The light beam is modulated by both gratings and detected by a plurality of photodetectors, each positioned behind one of the phase displaced zones. Pairs of phase displaced photodetector signals are processed at a comparator to provide a pair of phase quadrature digital waveforms for tracking the position of the displaceable member. Signal resolution is provided in the presence of zero displacement drift and vibration induced oscillation by interrogation of the photodetector signals which are filtered to provide average values. For zero displacement drift beyond system tolerance levels, a comparator senses the difference between a selected pair of analog signals as a function of amplitude, while decision edge determination in the presence of oscillation is resolved by detecting which of the filtered analog signals generating the digital waveform is greater.

REFERENCES:
patent: 3371335 (1968-02-01), Seewald
patent: 3661464 (1972-05-01), Hubbard
patent: 3973109 (1976-08-01), Foster
patent: 4047007 (1977-09-01), Dlugos

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