13 June 2005 A new approach for measurement of wire diameter by optical diffraction
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Abstract
A new approach for measurement of wire diameter lying in the range of 200 to 450 microns is proposed and demonstrated. The approach is based on evaluation of phase-correlation based similarity measure for two identical order fringes of a diffraction pattern. Diameter of wires is estimated by determining separation between identical order fringes. Robustness of the approach to noise is enhanced by using Gaussian and singular value decomposition based filtering. Implementation of the method with an off-the-shelf digital photo camera for acquiring experimental data from steel wires and thin slits have demonstrated an accuracy far better than 0.5% of dimension.
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Yogesh C. Diwan, Kameswara Rao Lolla, "A new approach for measurement of wire diameter by optical diffraction", Proc. SPIE 5856, Optical Measurement Systems for Industrial Inspection IV, (13 June 2005); doi: 10.1117/12.612649; https://doi.org/10.1117/12.612649
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KEYWORDS
Diffraction

Gaussian filters

Motion estimation

Fourier transforms

Mirrors

Cameras

Error analysis

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