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

Kimberley A. McCrae; Michael C. Roggemann; Byron M. Welsh

doi:10.1117/12.254188

14 October 1996 Optimum exposure time for speckle imaging through the atmosphere using the bispectrum technique

Kimberley A. McCrae, Michael C. Roggemann, Byron M. Welsh

Proceedings Volume 2828, Image Propagation through the Atmosphere; (1996) https://doi.org/10.1117/12.254188
Event: SPIE's 1996 International Symposium on Optical Science, Engineering, and Instrumentation, 1996, Denver, CO, United States

Abstract

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.

Citation Download Citation

Kimberley A. McCrae, Michael C. Roggemann, and Byron M. Welsh "Optimum exposure time for speckle imaging through the atmosphere using the bispectrum technique", Proc. SPIE 2828, Image Propagation through the Atmosphere, (14 October 1996); https://doi.org/10.1117/12.254188

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