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12 October 2015 Ultra precision machining technique of off-axis optics for coastal water remote sensing
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Proceedings Volume 9633, Optifab 2015; 963325 (2015)
Event: SPIE Optifab, 2015, Rochester, New York, United States
An off-axis optical system can effectively avoid some problems, such as aberrations, shielded area created by the secondary mirror and a narrow field of view (FOV), while an on-axis optical system has the problems. Inspired by the consideration, the off-axis optical system is generally used for hyperspectral sensors and telescopes. However, there are several obstacles limiting the productivity of the off-axis optics in fabrication and measurement processes. In this study, to overcome this weakness, we suggests a new fabrication technique using a customized jig, not separated from the work-piece. A convex aspheric mirror and the off-axis mirror are fabricated by Single Point Diamond Turning Machine (SPDTM) for comparison analysis of surface state. The mirrors are made from aluminum (Al6061-T6) and used for the reflectors of a coastal water remote sensing system. We show fast machining and simple measurement in comparison with traditional off-axis single machining and measurement, provide performance results, such as form accuracy and surface roughness measured by both contact 3D profilometer (UA3P) and non-contact 3D profiler (CCI-Optics). The customized ultra-precision machining process can be effectively used for complex off-axis mirror fabricating.
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Min-Woo Jeon, Sang-Won Hyun, Jeong-Yeol Han, and Geon-Hee Kim "Ultra precision machining technique of off-axis optics for coastal water remote sensing", Proc. SPIE 9633, Optifab 2015, 963325 (12 October 2015);

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