| http://www.w3.org/ns/prov#value | - Scalea et al5 used guided pulsed laser beam along with air-coupled sensor for earlier detection of the size and location of the transverse crack in their non-contact method successfully.The present study is a step forward to detect and to alarm earlier i.e. before passing of train, of such defect of transverse cracks or even of a loose fish plating on basis of ???Phase cancellation theory??? and b
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