Speckle imaging detector optimization and comparison

Details Speckle imaging detector optimization and comparison Speckle imaging detector optimization and comparison

Apr 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993opten..32..864t&link_type=abstract

Optical Engineering 32(04), 864-869, Brian J. Thompson; Ed.

Computer Science

Performance

5

Scientific paper

Speckle imaging is a statistical technique for achieving near-diffraction-limited imagery of astronomical objects with ground-based telescopes. The performance of this statistical postdetection processing technique is critically dependent on the signal-to-noise ratio (SNR) of the estimators used for various average spectra, which can be a strong function of detector characteristics. We discuss techniques for maximizing SNR under low-light conditions where so-called 'read noise' becomes a factor in CCD detectors, and we derive an optimal exposure time for CCD detection when total viewing time limits the SNR. We also show that a properly optimized CCD can outperform a shot-noise-limited detector, in terms of the SNR, at much lower light levels than without optimization.

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