Stellar image stabilization using piezo-driven active mirrors

Details Stellar image stabilization using piezo-driven active mirrors Stellar image stabilization using piezo-driven active mirrors

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1236..179d&link_type=abstract

IN: Advanced technology optical telescopes IV; Proceedings of the Meeting, Tucson, AZ, Feb. 12-16, 1990. Part 1 (A91-23201 08-89

Astronomy and Astrophysics

Astronomy

10

Charge Coupled Devices, Image Motion Compensation, Image Processing, Stellar Motions, Telescopes, Wave Fronts, Apertures, Mirrors, Piezoelectricity, Power Spectra, Real Time Operation, Seeing (Astronomy)

Scientific paper

As applied to the 4.2-m William Herschel Telescope, the multiaperture real-time image-normalization system presented implies a wavefront whose size requires a mask of six optimally-scaled subapertures. These subaperture images are separated and examined on a single image photon detector which yields x, y, and t coordinates for each recorded photon. The motions of these images feed back to six independent piezoactuated active mirrors which act to null the image motions at a CCD focus. Data are presented from two image normalization runs, with and without active mirrors, which illustrate the size and variation behavior of the coherent seeing length, characteristic seeing times, and power spectra.

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