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.