Nik Rajic

TL;DR: In this paper, the defect signal to noise ratio (SNR) of thermal inspection images was investigated to reduce false calls and allow for easier interpretation of a thermal inspection image, and several factors affecting defect SNR were studied such as data compression and reconstruction using principal component analysis and time window processing.

TL;DR: In this article, a quasi-active thermography inspection method for subsurface defect detection in the geomembrane is presented. But the results show that, while each algorithm has some limitations, when used in combination the three algorithms could be used to distinguish between different substrates and to determine the presence of subsural defects.

TL;DR: In this article, the effect of gauge length on sensor response for Bragg grating (FBG) sensors embedded in a woven glass fiber reinforced composite coupon has been investigated and the results show that the ratio of the gauge length to the curvature radius of the macro bending is critical with the optimal gauge length being a compromise between FBG reflectivity and sensor response.

TL;DR: In this article, the authors used simulation to investigate mobile thermal scanning for the detection and quantitative measurement of defects along the underside of a steel plate and made comparisons between mobile and stationary heating regimes.

TL;DR: In this article, the authors used Lamb wave tomographic reconstruction to detect damage in plate-like structures, such as delamination in hybrid materials such as Glare, corrosion, and through-hole damage in aluminium plate like structures, using Simultaneous Iterative Reconstructive Technique (SIRT).