Test and performance evaluation of the Gemini secondary mirror chopper and position control system

Kenneth R. Lorell; Jean-Noel Aubrun; Ernesto O. Perez; Paul J. Reshatoff Jr.; Donald F. Zacharie

doi:10.1117/12.319279

25 August 1998 Test and performance evaluation of the Gemini secondary mirror chopper and position control system

Kenneth R. Lorell, Jean-Noel Aubrun, Ernesto O. Perez, Paul J. Reshatoff Jr., Donald F. Zacharie

Proceedings Volume 3352, Advanced Technology Optical/IR Telescopes VI; (1998) https://doi.org/10.1117/12.319279
Event: Astronomical Telescopes and Instrumentation, 1998, Kona, HI, United States

Abstract

This paper describes the testing and performance evaluation of the Gemini secondary mirror control system. The mechanism and control system have demanding requirements for dynamic performance, precision position control throughout the mirror chop cycle, and the virtual elimination of residual forces and torques. The test procedures and hardware required to measure and verify the system performance were specifically developed for this application. The tests utilize a special computer-controlled laser interferometer to calibrate the mirror position sensors. Dynamic chopping performance of the system is also tested and verified. A range of chop waveform parameters; amplitude, frequency, and duty cycle, is employed to fully exercise the control system and electromechanical hardware. Measurements of angular stability and repeatability under dynamic chop conditions are made to verify performance. Effectiveness of the active force cancellation system is evaluated using a six-axis digital dynamometer.

Citation Download Citation

Kenneth R. Lorell, Jean-Noel Aubrun, Ernesto O. Perez, Paul J. Reshatoff Jr., and Donald F. Zacharie "Test and performance evaluation of the Gemini secondary mirror chopper and position control system", Proc. SPIE 3352, Advanced Technology Optical/IR Telescopes VI, (25 August 1998); https://doi.org/10.1117/12.319279

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