Mirror shape detection by reflection grating moiré method with optical design validation

D. Fontani; F. Francini; D. Jafrancesco; L. Mercatelli; P. Sansoni

doi:10.1117/12.612114

13 June 2005 Mirror shape detection by reflection grating moire method with optical design validation

D. Fontani, F. Francini, D. Jafrancesco, L. Mercatelli, P. Sansoni

Proceedings Volume 5856, Optical Measurement Systems for Industrial Inspection IV; (2005) https://doi.org/10.1117/12.612114
Event: Optical Metrology, 2005, Munich, Germany

Abstract

Shape detection on objects of large and huge dimensions has always represented a challenging task, mostly by the practical point of view due to the size of the related measurement equipment. When the tested object is a mirror the measurements is additionally complicated, since the classical techniques of structured light cannot be directly applied. The method proposed in this paper has been applied to measure the curvature of a deformable mirror of 1-meter diameter for a heliostat plant. The mirror shape is obtained studying the spatial variations of a grating projected on the sample and reflected by it on a screen. The measurement set-up employs a PC projector and a digital camera. The results of this curvature assessment are compared to those derived from a simulation obtained by an optical design programme.

Citation Download Citation

D. Fontani, F. Francini, D. Jafrancesco, L. Mercatelli, and P. Sansoni "Mirror shape detection by reflection grating moire method with optical design validation", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); https://doi.org/10.1117/12.612114

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