18 July 2014 Experimental validation of Advanced Dispersed Fringe Sensing (ADFS) algorithm using Advanced Wavefront Sensing and Correction Testbed (AWCT)
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Abstract
Large aperture telescope commonly features segment mirrors and a coarse phasing step is needed to bring these individual segments into the fine phasing capture range. Dispersed Fringe Sensing (DFS) is a powerful coarse phasing technique and its alteration is currently being used for JWST. An Advanced Dispersed Fringe Sensing (ADFS) algorithm is recently developed to improve the performance and robustness of previous DFS algorithms with better accuracy and unique solution. The first part of the paper introduces the basic ideas and the essential features of the ADFS algorithm and presents the some algorithm sensitivity study results. The second part of the paper describes the full details of algorithm validation process through the advanced wavefront sensing and correction testbed (AWCT): first, the optimization of the DFS hardware of AWCT to ensure the data accuracy and reliability is illustrated. Then, a few carefully designed algorithm validation experiments are implemented, and the corresponding data analysis results are shown. Finally the fiducial calibration using Range-Gate-Metrology technique is carried out and a <10nm or <1% algorithm accuracy is demonstrated.
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Xu Wang, Xu Wang, Fang Shi, Fang Shi, Norbert Sigrist, Norbert Sigrist, Byoung-Joon Seo, Byoung-Joon Seo, Hong Tang, Hong Tang, Siddarayappa Bikkannavar, Siddarayappa Bikkannavar, Scott Basinger, Scott Basinger, Oliver Lay, Oliver Lay, } "Experimental validation of Advanced Dispersed Fringe Sensing (ADFS) algorithm using Advanced Wavefront Sensing and Correction Testbed (AWCT)", Proc. SPIE 9151, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation, 91513N (18 July 2014); doi: 10.1117/12.2056554; https://doi.org/10.1117/12.2056554
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