Edge Sensors For A Segmented Mirror

Terry S. Mast; George Gabor; Jerry E. Nelson

doi:10.1117/12.937989

3 November 1983 Edge Sensors For A Segmented Mirror

Terry S. Mast, George Gabor, Jerry E. Nelson

Proceedings Volume 0444, Advanced Technology Optical Telescopes II; (1983) https://doi.org/10.1117/12.937989
Event: 1983 Astronomy Conferences, 1983, London, United Kingdom

Abstract

The measurement of the relative orientations of mirror segments is the basis for the active control of a segmented mirror. We describe a system of capacitive displacement sensors which will be used to make these measurements in the University of California Ten Meter Telescope. The global sensing system design and the control algorithm are summarized. The detailed mechanical and electronic designs of a sensor are described along with the performance of prototype sensors under a variety of tests. The relationship between the sensor characteristics and the image quality of the segmented mirror is described. The sensor output is 1 millivolt per nanometer of displacement. This sensitivity and the small noise, drift, and thermal sensitivity are adequate to allow essentially continuous figure control to the precision required for optical and infrared astronomy.

Citation Download Citation

Terry S. Mast, George Gabor, and Jerry E. Nelson "Edge Sensors For A Segmented Mirror", Proc. SPIE 0444, Advanced Technology Optical Telescopes II, (3 November 1983); https://doi.org/10.1117/12.937989

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