Deconvolution Procedure for Crack Depth Determination Using Rayleigh Waves

This paper describes a method for determining the depth of machined slots simulating cracks by the use of Rayleigh waves. Six slots varying in depth from 0.5 mm to 3.0 mm fabricated in medium carbon steel have been sized using a commercially available 1.5 MHz Rayleigh wave transducer. One measurement using the pulse-echo method is made for determining the depth of the crack. Minima in the deconvolved spectra are shown to correspond to various vibration modes of the crack. A fixed-free bar vibration model yields acceptable results. A correlation study between various time-domain features with slot depth is also included