From Event: SPIE Optical Engineering + Applications, 2017
A method to evaluate tolerance sensitivities for lenses used to produce uniform illumination is presented. Closed form surfaces are used to define optical surfaces and relative illumination is calculated from light etendue considerations.
Jieun Ryu and Jose Sasian, "Tolerancing a lens for LED uniform illumination," Proc. SPIE 10377, Optical System Alignment, Tolerancing, and Verification XI, 1037703 (Presented at SPIE Optical Engineering + Applications: August 06, 2017; Published: 22 August 2017); https://doi.org/10.1117/12.2276864.
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