Carbon fibre reinforced polymer (CFRP) structures are widely used in the aerospace industry for their low weight and strong mechanical properties. However, they prone to impact damage due brittle nature. Edge Illumination X-ray Phase Contrast imaging (EI XPCi), a novel, phase-based technique, was compared against two established non-destructive evaluation methods detection CFRP plates. Planar E...

Ultrasonic wavefield imaging (UWI) provides insightful spatial information about ultrasonic wave propagation in planar (2-D) space for nondestructive evaluation and structural health monitoring (NDE-SHM) applications. In all materials, the wavefronts of incident reflected waves propagate with unique patterns that may be represented by parametrized polar curves 2-D geometric space. this paper, a...

time-of-flight diffraction method (tofd) is an amplitude-independent sizing method which is based on the measurement of time-of-flight of defect tip diffracted waves. although tofd can measure through-wall length of defect accurately, this method is not capable of measuring horizontal defect size. in this paper, a new tofd method for evaluating horizontal planar defects is presented. the finite...

We present a perception system for enabling automated loading with waistarticulated wheel loaders. To enable autonomous loading of piled materials, using either above-ground wheel loaders or underground load-haul-dump vehicles, 3D data of the pile shape is needed. However, using common 3D scanners, the scan data is distorted while the wheel loader is moving towards the pile. Existing methods th...

A novel approach is proposed for building a planar array derived from linear arrays using toolbox of different types subarrays located parallel and perpendicular to the axes. The design assumes constant element patterns focuses on rectangular applications with one dimensional, wide-angular beam scanning. Optimization criteria concern trade-off between side lobe level performance, directive gain...

We have implemented a method that detects planar regions from 3D scan data using Random Sample Consensus (RANSAC) algorithm to address the issue of a tradeoff between the scanning speed and the point density of 3D scanning. However, the limitation of the implemented method has not been clear yet. In this paper, we conducted an additional experiment to evaluate the implemented method by changing...

This paper describes a novel image-based method for tracking robotic mechanisms and interventional devices during Magnetic Resonance Image (MRI)-guided procedures. It takes advantage of the multi-planar imaging capabilities of MRI to optimally image a set of localizing fiducials for passive motion tracking in the image coordinate frame. The imaging system is servoed to adaptively position the s...