1 April 1996 Enhancement of wire diameter measurements: comparison between Fraunhofer diffraction and Lorenz-Mie theory
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Abstract
The Fraunhofer diffraction is compared with a numerical simulation based on the Lorenz-Mie theory to improve the performance of a laser diffraction instrument. This instrument, based on the analysis of diffraction fringes at the focal plane of a lens, is especially suitable for individual wire diameter measurements. We show that the error due to Fraunhofer approximation increases with an increase of the reflectivity and a decrease of the object diameter. Comparison with Lorenz-Mie theory enables us to correct these errors. For a given object, the laser diffraction instrument reproduces diameter measurements with a very small dispersion.
Denis Lebrun, Samir Belaid, Cafer Ozkul, Kuan Fang Ren, Gerard Grehan, "Enhancement of wire diameter measurements: comparison between Fraunhofer diffraction and Lorenz-Mie theory," Optical Engineering 35(4), (1 April 1996). https://doi.org/10.1117/1.600703 . Submission:
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