The optimized calculation of driving points distribution in large segmented mirrors

Mei Hui; Yu-di Zou

doi:10.1117/12.839669

25 November 2009 The optimized calculation of driving points distribution in large segmented mirrors

Mei Hui, Yu-di Zou

Proceedings Volume 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments; 75060X (2009) https://doi.org/10.1117/12.839669
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

The cophase calibration system is applied for adaptive optical phasing with a large segmented telescope mirror, which commonly uses 3-DOF micro-position device with three micro-displacement actuators to drive segments in parallel, making the entire segmented mirror in phase at one time and obtaining the desired sensor readings accordingly. In order to run the active control system to make the segments cophase, it is necessary to calculate the coordinates of the three driving points correctly for segmented mirrors specially limited in geometric parameters, especially for the stability and sensitivity of the micro-positioning device. The mirrors will be supported on a massively parallel system of electrostatically controlled, interconnected microactuators that can be coordinated to achieve precise actuation Adjusting posture of each segment independently so as to obtain the co-phasing errors and to control them at a nanometer level. Several generations of individual actuators as well as parallel arrays of actuators with segmented mirrors have been designed. A mechanical model of the system has been constructed and simulated numerically to obtain the actual position of three actuators using the RPY angle describing means. A three-channel parallel control scheme has been developed and implemented on a segmented mirror array. A universal evaluating method for optimization is prompted and will be a good guide to the design optimization of micro-positioning device for each segmented mirror when the mirrors are groundbased horizontally.

Citation Download Citation

Mei Hui and Yu-di Zou "The optimized calculation of driving points distribution in large segmented mirrors", Proc. SPIE 7506, 2009 International Conference on Optical Instruments and Technology: Optical Systems and Modern Optoelectronic Instruments, 75060X (25 November 2009); https://doi.org/10.1117/12.839669

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KEYWORDS

Actuators

Segmented mirrors

Ferroelectric materials

Mirrors

Image segmentation

Mathematical modeling

Control systems

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