Electro-optical displacement sensor

Details Electro-optical displacement sensor Electro-optical displacement sensor

1987-09-24

1989-07-04

Roskoski, Bernard

Coded data generation or conversion

Digital pattern reading type converter

Optical

341 1, 341 14, 250237G, 33 1D, H03M 122

Patent

active

048454966

ABSTRACT:
An electro-optical displacement sensor comprises an optical source including a plurality of optical grating lines for producing from an incident optical signal a transmitted optical signal having a spatially periodic intensity pattern. Optical sensing means receives the transmitted signal as an input across a plurality of optical receptors, each of which receptors provides an output signal corresponding to the amplitude of the transmitted signal as sensed by the receptor. The receptors are spaced one from the other by a distance different from the fundamental spatial wavelength of the transmitted signal. Signal conditioning means derive a signal vector from the receptor output signals, the signal vector than being processed to derive first and second independent component signals. The component signals are then combined to produce an interpolated phase signal corresponding to the interpolated position of the grating lines relative to the optical receptors.

REFERENCES:
patent: 3882302 (1975-05-01), Deichmiller et al.
patent: 4047025 (1977-09-01), Lemelson
patent: 4100420 (1978-07-01), Metcalf et al.
patent: 4572952 (1986-02-01), March

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