Optimum exposure time for speckle imaging through the atmosphere using the bispectrum technique

Details Optimum exposure time for speckle imaging through the atmosphere using the bispectrum technique Optimum exposure time for speckle imaging through the atmosphere using the bispectrum technique

Oct 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996spie.2828..397m&link_type=abstract

Proc. SPIE Vol. 2828, p. 397-408, Image Propagation through the Atmosphere, J. C. Dainty; Luc R. Bissonnette; Eds.

Computer Science

Scientific paper

Bispectrum speckle imaging uses the average of many short exposure frames to eliminate atmospheric effects on images. Unfortunately, objects are often dim, requiring longer exposure times to collect enough photons to reconstruct an image. We investigate this trade-off using a computer simulation to create image frames under various seeing conditions, then determine the exposure time that yields the highest signal-to-noise ratio for the unbiased speckle interferometry estimator and the lowest mean square error for the reconstructed phase. We have found that for low light levels and for high read noise cases the optimum exposure time is greater than one Greenwood coherence time.

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