High-resolution encoding using redundant edge detection

Details High-resolution encoding using redundant edge detection High-resolution encoding using redundant edge detection

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2479..329s&link_type=abstract

Proc. SPIE Vol. 2479, p. 329-340, Telescope Control Systems, Patrick T. Wallace; Ed.

Physics

Scientific paper

Encoding the angular position of large telescopes is typically achieved through the use of friction driven rotary encoders, tape style encoders mounted on the circumference of each telescope axis or co-axially mounted high precision rotary encoders. These forms of encoding have very stringent mounting requirements, are expensive, adversely affected by contaminating particles and often difficult to retrofit to existing telescopes. The advent of long CCDs presents the opportunity to develop accurate position encoding for telescope control using digital image metrology. In this paper we present the design of a high precision non- contact encoding system which uses the detection of multiple redundant visual edge features to develop sub-pixel edge position measurements to a precision of 1/50th pixel. The method is described in detail and is validated with both simulation trials and experimental results from a testbed setup.

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