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Creators/Authors contains: "Varvaringos, Ioannis"

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  1. ; ; ; ; ; ; ; ; ; ; et al (, Proc. SPIE 12188, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation V)
    Geyl, Roland; Navarro, Ramón (Ed.)
    A consortium of industrial and academic partners, coordinated by TNO, is working on the realization of a 620mm adaptive secondary mirror (ASM) for the University of Hawaii’s 2.2-meter telescope. The ASM consists of a 620mm-diameter slumped convex aspherical mirror shell, manipulated by 210 variable-reluctance actuators mounted on a light-weighted support frame. The mirror shell is manufactured to the required accuracy at low cost through slumping. The actuators are driven by dedicated PWM current drivers and commanded through a real-time FPGA-based interface. After successful performance testing of several laboratory prototypes, this project will provide the definitive on-sky demonstration of this new technology. We report on the manufacturing and testing of the major subsystems, and on the integration status of the ASM as a whole. 
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