NREL is presenting an indoor optical measurement system for large heliostat mirrors. This is a target-based deflectometry system, which uses a thin printed patterned targets and a moving camera to scan large mirrors, measuring the surface slope. This system is compared to existing fringe deflectometry and photogrammetry measurement systems, and the computer vision techniques that make it possible are described. While it cannot achieve the resolution of a fringe deflectometry system, the simplicity and low cost of setup make it well suited for the CSP industry.
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