Moire distance measurement method and apparatus

Details Moire distance measurement method and apparatus Moire distance measurement method and apparatus

1989-04-06

1991-01-29

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 4, G01N 2186

Patent

active

049888862

ABSTRACT:
A Moire distance measurement technique for measuring the distance that a diffusely reflecting surface moves involves projecting a first grating onto the surface, imaging the projected grating onto a second grating to form a Moire pattern, and measuring a change in the Moire pattern as the surfaces move to determine the distance that the surface has moved.

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