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23 July 2008 Design of high-resolution variable size spatial filter for Gemini Planet Imager using flexure elements
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Abstract
This paper presents a design of a variable size spatial filter used in the wavefront sensor subsystem of the Gemini Planet Imager instrument. It describes an adjustable mechanism consisting of two slides forming a square aperture which can be varied in size between 1.8 and 6.7 mm. These slides are located on athermalized flexure mounts that move opposite to one another driven by a single precision linear actuator. The device retains long term dimensional stability, resolution, and repeatability on a micron level for all gravity vector orientations and for temperatures between -5°C and + 25°C.
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Vlad Reshetov and Joeleff Fitzsimmons "Design of high-resolution variable size spatial filter for Gemini Planet Imager using flexure elements", Proc. SPIE 7018, Advanced Optical and Mechanical Technologies in Telescopes and Instrumentation, 701856 (23 July 2008); https://doi.org/10.1117/12.789515
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