Focus Retrocollimated Interferometry for Long-Radius-of-Curvature Measurement.
Focus retrocollimated interferometry is described for measuring long radius of curvature (>/=1 m), and achievable accuracy is discussed. It is shown that this method can be applied to both concave and convex spherical surfaces and can provide measurement to accuracy of 0.01-0.1%.
Xiang
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