31 October 2016 Slope error tolerance analysis for candela distribution of total-internal-reflection collimating lens
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Abstract
This paper presented a general concentration standard index (GCSI) for 3D TIR lenses, which is introduced as a metric for analyzing the luminous intensity at certain angle, both locally and globally. A Three- Dimensional (3D) slope error tolerance model for TIR lens is constructed and the slope error sensitivities for luminous intensity for different angels are derived. How the slope error impact on the angular candela distribution is obtained with calculation of the slope error impact on the Beam angle (the Full Width at Half Maximum luminous intensity (FWHM)) and the Filed Angle (the Full Width at 10% Maximum luminous intensity). The results revealed that the Beam Angle is decreased at first and then increased with the increased slope error, whereas the Filed angle is monotonically increasing with the slope errors. According theory has been well demonstrated with Monte Carlo ray tracing due to RMS uniformity as low as 1.8% for Beam angle and 2.23% for Filed angle.
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Tao Luo, Tao Luo, Gang Wang, Gang Wang, "Slope error tolerance analysis for candela distribution of total-internal-reflection collimating lens", Proc. SPIE 10021, Optical Design and Testing VII, 100211G (31 October 2016); doi: 10.1117/12.2246056; https://doi.org/10.1117/12.2246056
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