Light amplitude control system for position and motion...

Details Light amplitude control system for position and motion... Light amplitude control system for position and motion...

H - Electricity

01

J

340/148.2, 340/1

H01J 3/14 (2006.01) G01D 5/36 (2006.01)

Patent

CA 1103328

ABSTRACT OF THE DISCLOSURE An opto-electronic transducer for determining position and/or velocity of one member with respect to another member is provided with light amplitude control. The transducer is comprised of a scale with a trans- mission grating on a first track and an indexing bar near each end of a sec- ond track adjacent the first, and a reticle with two sections of the same grating, one section being offset spatially one quarter cycle with respect to the other section for producing quadrature signals through two photosen- sors opposite the first track from which relative position and/or velocity between the reticle and the scale can be determined. A slit is provided in the reticle in order to provide information for determining position relative to the indexing bars. A single photosensor opposite the second track is used both to detect the indexing bars and to provide a feedback control signal to maintain the amplitude of light illuminating the scale and reticle constant.

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