Displacement transducer which simultaneously extracts signals vi

Details Displacement transducer which simultaneously extracts signals vi Displacement transducer which simultaneously extracts signals vi

1985-04-19

1987-07-14

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250237G, 340347P, G01D 534

Patent

active

046804668

ABSTRACT:
A displacement transducer comprising a code disk on which a plurality of light permeable slits arranged with a fixed pitch are formed, a light source which emits light to the code disk, and an image sensor which receives the light from the light source through the light permeable slits. High resolution and fast response performance are realized by measuring a displacement of the code disk from the amount of the phase shift of a fundamental wave component contained in the output obtained from the image sensor. There is a further advantage of suppressing zero point return operation to a minimum as well as improving linearity of an image sensor.

REFERENCES:
patent: 4384204 (1983-05-01), Tamaki et al.
patent: 4445110 (1984-04-01), Breslow
patent: 4465928 (1984-08-01), Breslow

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