23 July 2008 Piezo-driven adjustment of a cryogenic detector
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Abstract
This paper presents the specifications, design, construction and evaluation of a piezo-driven tip/tilt/focus mechanism which can align a detector or any other optical component in a cryogenic environment. Even with a no-adjustment design philosophy, usually one or two components have to be adjusted in order to compensate for the total of optical and mechanical tolerances in an optical cryogenic instrument. Normally these adjustments are made by means of shims or stiff screw mechanisms and are applied at room temperature. In order to adjust the particular component(s), mostly by just a few microns, the high-risk and time-consuming operation of opening a cryostat is required. For a large cryostat the typical cycle of cooling, testing, warm-up, opening, adjustment, closing and cooling again, takes roughly two weeks. Often the cycle needs to be repeated a few times before the required position is obtained. ASTRON developed a piezo driven tip/tilt/focus mechanism which can adjust a detector or any other optical component in both the ambient and cryogenic (<100 K, vacuum) environment. Only during adjustment the system is active, for the rest of time it is a passive robust system with a high stability. The main specifications are a stroke of ± 0,6 mm and tip/tilt of ±1,2 mrad.
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Johan H. Pragt, Raymond van den Brink, Gabby Kroes, Niels Tromp, Jean-Baptiste Ochs, "Piezo-driven adjustment of a cryogenic detector", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 70184N (23 July 2008); doi: 10.1117/12.788396; https://doi.org/10.1117/12.788396
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