13 September 2012 SCOTS: a useful tool for specifying and testing optics in slope space
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When defining surface irregularities more often than not it is useful to represent these as slope errors rather than surface errors. However, surface error specifications are more commonly used even though they do not accurately represent performance but simply physical characteristics. An example of slope measurement technique and specification is a method developed by the University of Arizona called SCOTS (Software Configurable Optical Test System) which has showed to be accurate, while very fast and easy to setup. It directly measures the transverse ray aberration/slope of an optical system using transmission deflectometry.
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Margaret Z. Dominguez, Margaret Z. Dominguez, John Armstrong, John Armstrong, Peng Su, Peng Su, Robert E. Parks, Robert E. Parks, James H. Burge, James H. Burge, } "SCOTS: a useful tool for specifying and testing optics in slope space", Proc. SPIE 8493, Interferometry XVI: Techniques and Analysis, 84931D (13 September 2012); doi: 10.1117/12.931112; https://doi.org/10.1117/12.931112

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