Proceedings PaperTheoretical analysis of optical systems subjected to mechanical stress: an application to ISO star sensor design
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This work concerns the analysis of errors induced on optical systems by mechanical stresses. These errors are a consequence of deformations induced by mounts, spacers, and similar things in contact with the optical surfaces. This analysis is essential to drive the mechanical design of very accurate optomechanical systems. The authors developed a method based on a finite elements modelling of the optical system and on interferometric measurement of the real surfaces deformation. The mechanical behavior of optomechanical items is evaluated by means of a structural analysis software package (ANSYS). The deformed finite elements model is transformed in a surface representation suitable for optical ray tracing, by means of a Zernike polynomial fitting. The mechanical stresses of real optical elements are measured by an interferometer and the surfaces are represented fitting the reflected or transmitted wavefront with the same method. The complete optical system under stress condition is then analyzed using an optical design program provided by a specialized ray tracing routine, supporting a Zernike polynomial representation of the optical surfaces. An application of this method was done on the optomechanical design of I..O. Star Sensor developed within an ESA program.