title: Applying computational geometry techniques for advanced feature analysis in atom probe data.
abstract: In this paper we present new methods for feature analysis in atom probe tomography data that have useful applications in materials characterisation. The analysis works on the principle of Voronoi subvolumes and piecewise linear approximations, and feature delineation based on the distance to the centre of mass of a subvolume (DCOM). Based on the coordinate systems defined by these approximations, two examples are shown of the new types of analyses that can be performed. The first is the analysis of line-like-objects (i.e. dislocations) using both proxigrams and line-excess plots. The second is interfacial excess mapping of an InGaAs quantum dot.
authors.affiliation: Australian Centre for Microscopy and Microanalysis, The University of Sydney, Madsen Building F09, NSW 2006, Camperdown, Australia. Electronic address: peter.felfer@sydney.edu.au.
authors.forename: Peter
authors.initials: P
authors.lastname: Felfer
authors.forename: Anna
authors.initials: A
authors.lastname: Ceguerra
authors.forename: Simon
authors.initials: S
authors.lastname: Ringer
authors.forename: Julie
authors.initials: J
authors.lastname: Cairney
keywords: Atom probe tomography; Data analysis; Interfacial excess; Interfacial excess mapping; Proxigram