Adaptive optics: effect of sampling rate and time lags on the closed-loop bandwidth

Jean-Paul Gaffard; Corinne Boyer

doi:10.1117/12.19311

1 August 1990 Adaptive optics: effect of sampling rate and time lags on the closed-loop bandwidth

Jean-Paul Gaffard, Corinne Boyer

Proceedings Volume 1237, Amplitude and Intensity Spatial Interferometry; (1990) https://doi.org/10.1117/12.19311
Event: SPIE Astronomical Telescopes and Instrumentation for the 21st Century, 1990, Tucson, AZ, United States

Abstract

The purpose of the study is to establish the time transfer function of an adaptive-system loop with a CCD camera. Each component of the loop is replaced by its transfer function. The time lags due to the CCD matrix and calculations are determined. The effects of the sampling rate and the time lags on gain and bandwidth are studied by using the Nichols criterion defining the loop stability. It is concluded that the input should be phase perturbations expressed on the basis of the actuator correction shapes, while the output should be the voltage applied at the power amplifiers in order to obtain correction strokes.

Citation Download Citation

Jean-Paul Gaffard and Corinne Boyer "Adaptive optics: effect of sampling rate and time lags on the closed-loop bandwidth", Proc. SPIE 1237, Amplitude and Intensity Spatial Interferometry, (1 August 1990); https://doi.org/10.1117/12.19311

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