Displacement measuring apparatus

Details Displacement measuring apparatus Displacement measuring apparatus

1977-05-06

1978-09-19

Corbin, John K.

Optics: measuring and testing

Refraction testing

Prism engaging specimen

250237G, 356169, G01B 1126, G01B 902, G02B 2738

Patent

active

041150082

ABSTRACT:
Apparatus for measuring the extent and sense of relative movement between two objects comprises a reflecting ruled grating carried on one body and optical reading head carried on the other. The reading head includes a light source arranged to produce at least three light beams which are directed at the grating and reflected therefrom onto a mirror twisted about a line parallel to the grating lines. This mirror reflects the light beams onto a different area of the grating from which they are reflected to separate light-sensitive devices. Lenses are used to focus the light beams as required.

REFERENCES:
patent: 3586665 (1971-06-01), Weyrauch
patent: 3879136 (1975-04-01), Takeda
Design Digest "Projection Measuring System Uses Moire Fringe Techniques", OEM Design, 11-1976, p. 14.

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