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Comment Why does it have to be liquid? (Score 1) 196

It would seem a relatively simpler matter to stretch a thin mylar membrane over a frame, like a drum head, apply a partial vacuum to introduce the basic curvature and then control the surface with a combination of loudspeaker-like actuators, operating at frequencies designed to create standing waves of arbitrary shape according to the needs of an adaptive optics control system. This would have the advantages: lightweight, easy to assemble, use of off-the-shelf speaker technology, very high response time, relatively low power requirements, etc. What's not to like?

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