From Event: SPIE Optical Engineering + Applications, 2016
In the design of a lens the most important parameter is the paraxial focal length. Though, most focal length measurement
methods are not measuring the paraxial focal length, but a focal length influenced by aberrations. We have developed a
method to determine the paraxial focal length of strong focusing lenses using experimental ray tracing in a 2D cross
section measurement. The method developed by us gives a much higher accuracy in measuring the paraxial focal length
than the compared methods according to the German Institute for Standardization and Neal et al.. It shows an accuracy
of up to 0.15% in measurement.
Tobias Binkele, David Hilbig, Friedrich Fleischmann, and Thomas Henning, "Determination of the paraxial focal length of strong focusing lenses using Zernike polynomials in simulation and measurement," Proc. SPIE 9960, Interferometry XVIII, 99600N (Presented at SPIE Optical Engineering + Applications: August 31, 2016; Published: 28 August 2016); https://doi.org/10.1117/12.2238059.
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