Enhancement of wire diameter measurements: comparison between Fraunhofer diffraction and Lorenz-Mie theory

Denis Lebrun; Samir Belaid; Cafer Ozkul; Kuan Fang Ren; Gerard Grehan

doi:10.1117/1.600703

1 April 1996 Enhancement of wire diameter measurements: comparison between Fraunhofer diffraction and Lorenz-Mie theory

Denis Lebrun, Samir Belaid, Cafer Ozkul, Kuan Fang Ren, Gerard Grehan

Optical Engineering, Vol. 35, Issue 4, (April 1996). https://doi.org/10.1117/1.600703

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.

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Denis Lebrun, Samir Belaid, Cafer Ozkul, Kuan Fang Ren, and 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

Published: 1 April 1996

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