This paper presents research work on the surface control of active segments of the Segmented Mirror Telescope (SMT) at the Naval Postgraduate School. The segments integrate a precision nanolaminate foil sheet with a silicon carbide substrate embedded with lead magnesium nicobate (PMN) face sheet actuators. Influence coefficients that relate actuator input voltages to segment wave front error are determined both experimentally and analytically. Experimental center of curvature test results as well as NASTRAN analysis is used to determine influence matrix between actuator input voltages and segment surface deformation. The CodeV and SigFit programs are used to convert surface distortions into wavefront errors. The correlation between the analytical and experimental results is good. The actuation voltage limit for the actuators is 25V to 75V. Least square constraint optimization technique is used to determine required voltage for correcting wavefront error of the segments. The wavefront error of the segment surface is reduced by 65% by using these actuators.
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