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

Details Adaptive optics - Effect of sampling rate and time lags on the closed loop bandwidth Adaptive optics - Effect of sampling rate and time lags on the closed loop bandwidth

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990spie.1237..376g&link_type=abstract

IN: Amplitude and intensity spatial interferometry; Proceedings of the Meeting, Tucson, AZ, Feb. 14-16, 1990 (A91-30676 12-89).

Physics

Optics

Actuators, Adaptive Optics, Charge Coupled Devices, Feedback Control, Transfer Functions, Bandwidth, Digital To Analog Converters, Mirrors, Power Amplifiers, Time Lag

Scientific paper

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.

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