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Phase-retrieval analysis of pre-and post-repair Hubble Space Telescope images

Krist, John E.; Burrows, Christopher J.

Phase-retrieval measurements of point-spread functions from the pre- and post-repair Hubble Space Telescope are presented. The primary goal was to determine the aberrations present in the second wide-field and planetary camera (WFPC2) to align and validate its corrective optics. With both parametric model-fitting techniques and iterative (Gerchber…

Combined approach to the Hubble Space Telescope wave-front distortion analysis.

Roddier, Claude; Roddier, Francois

Stellar images taken by the Hubble Space Telescope at various focus positions have been analyzed to estimate wave-front distortion. Rather than using a single algorithm, the authors found that better results were obtained by combining the advantages of various algorithms. For the planetary camera, the most accurate algorithms consistently gave a s…

Maximum entropy restoration of blurred and oversaturated Hubble Space Telescope imagery

Dorband, J. E.; Bonavito, N. L.; Busse, T.

Photomultiplier for optically probing Comet Halley

Llebaria, A.; Lamy, P.; Levasseur-Regourd, A. C. +7 more

A low mass eight-color channel photopolarimeter was developed for the Giotto spacecraft. Utilizing the spin of the spacecraft, a multichannel plate photomultiplier, and a unique optical design, the instrument required no moving parts to measure color and linear polarization. The photopolarimeter collected data as the spacecraft passed through the …