3708231 is referenced by 69 patents and cites 7 patents.

A device for the precision measuring of angular movements. The device incorporates an optical lever utilizing a predetermined number of reflections to increase the displacement of a light beam to be read out by discrete sensors. Ambiguities resulting from the amplification of displacement are resolved by determining displacement at a plurality of points of reflection and by using periodic logic on the sensor outputs.

Title
Precision angle measuring device
Application Number
05/870,376
Publication Number
3708231
Application Date
November 10, 1969
Publication Date
January 2, 1973
Inventor
Walters Glenn A
IPC
G01b 11/26
G01D 05/26
G01D 05/30
G01C 09/04
G01C 09/00
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