Digital electrical position transducer

Details Digital electrical position transducer Digital electrical position transducer

1977-06-27

1978-08-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

340347P, G01D 534

Patent

active

041106105

ABSTRACT:
An electro-optical position transducer employs an optical mask having a number of parallel channels formed of alternating opaque and transparent sections extending along the direction of motion of a movable member. One channel has opaque and transparent sections, and the section lengths correspond to the smallest measureable increment. This channel generates the least significant bit of the code. A pair of channels, displaced linearly relative to one another, are provided for each of the higher order bits. Pairs of LED's and photo-transistors are provided for each channel and extend in a line normal to the length of the channel. The outputs of the photo-transistors are decoded so that all transitions between binary values in the output signal occur in synchronism with transitions of the least significant digit.

REFERENCES:
patent: 3410976 (1968-11-01), Watson
patent: 3487400 (1969-12-01), Ludewig et al.

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