Infrared Imaging Using a Prototype Adaptive Secondary Mirror for Rapid Tip-Tilt Correction

Details Infrared Imaging Using a Prototype Adaptive Secondary Mirror for Rapid Tip-Tilt Correction Infrared Imaging Using a Prototype Adaptive Secondary Mirror for Rapid Tip-Tilt Correction

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...181.7410m&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #74.10; Bulletin of the American Astronomical Society, Vol. 24, p.1240

Computer Science

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Scientific paper

The secondary mirrors of large telescopes are natural locations to perform adaptive correction for wavefront errors induced by atmospheric seeing. At Steward Observatory's 2.3 meter telescope, we have implemented a prototype "adaptive secondary" (FASTTRAC) to correct rapidly (100 Hz closed loop) for wavefront tip-tilt at wavelengths from 1-5 microns. The resulting long exposure images are thereby stabilized and, in excellent seeing conditions (D/ro < 4), are diffraction-limited ( ~ 0.2-0.4" FWHM). The existing f/45 secondary mirror is now piezoelectrically controlled to provide two-axis tilting motions. The mirror mount is designed to reduce vibration effects. Performance data show image stabilization of <0.1" rms at 50 Hz even in average seeing (D/ro =8). Sensing of image motion is accomplished in the infrared with a 58x62 InSb detector operating in subarray imaging mode with nondestructive readouts for frame rates as high as 100 Hz. Images can be tracked through motion of either the centroid or the brightest instantaneous speckle. Simultaneous long exposure imaging with a NICMOS3 detector takes advantage of a wide field-of-view (1x1') consistent with the large isoplanatic patch for tip-tilt correction. We present H and K band images of the Galactic Center (Sgr A*) and the star formation regions S106 and LkHα 101. These images have FWHM=0.4-0.7". This work is supported by grants from the NSF (AST 88-22465;AST 92-03336) and NASA (NAGW-2254). L.M. Close is supported by a NSERC graduate scholarship.

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