All Outputs (30)

Review of defects in lattice structures manufactured by powder bed fusion (2019)
Journal Article

Additively manufactured lattice structures are popular due to their desirable properties, such as high specific stiffness and high surface area, and are being explored for several applications including aerospace components, heat exchangers and biome... Read More about Review of defects in lattice structures manufactured by powder bed fusion.

Uncertainty model for a traceable stereo-photogrammetry system (2019)
Journal Article

Through the computational modelling and experimental verification of a stereo-photogrammetry system, the expanded uncertainty on form measurement was estimated and was found to be , and for a 95% confidence interval (coverage factors of = 3.2, 2.0... Read More about Uncertainty model for a traceable stereo-photogrammetry system.

Design and characterisation of an additive manufacturing benchmarking artefact following a design-for-metrology approach (2019)
Journal Article

We present the design and characterisation of a high-speed sintering additive manufacturing benchmarking artefact following a design-for-metrology approach. In an important improvement over conventional approaches, the specifications and operating pr... Read More about Design and characterisation of an additive manufacturing benchmarking artefact following a design-for-metrology approach.

Comparison and validation of surface topography segmentation methods for feature-based characterisation of metal powder bed fusion surfaces (2019)
Journal Article

Feature-based characterisation, i.e. the characterisation of surface topography based on the isolation of relevant topographic formations (features) and their dimensional assessment, is a developing field of surface texture metrology. Feature-based a... Read More about Comparison and validation of surface topography segmentation methods for feature-based characterisation of metal powder bed fusion surfaces.

Intelligent systems for optical form measurement: automated assessment of pose and coverage (2019)
Conference Proceeding

Automated characterisation of multi-view fringe projection system for three- dimensional measurement of additively manufactured parts (2019)
Conference Proceeding

Digital fringe projection is a non-contact method that is widely used for the dimensional characterisation of complex manufactured parts. However, single camera-projector fringe projection systems struggle to acquire the full three-dimensional point... Read More about Automated characterisation of multi-view fringe projection system for three- dimensional measurement of additively manufactured parts.

Comparison of two noise reduction methods in coherence scanning interferometry for surface measurement (2019)
Conference Proceeding

Coherence scanning interferometry (CSI) can measure relatively flat surfaces with sub-nanometre precision, but the measurement noise may increase significantly if the intensity of the interferometric signal reduces when measuring non-flat surfaces or... Read More about Comparison of two noise reduction methods in coherence scanning interferometry for surface measurement.

Modelling Fringe Projection Based on Linear Systems Theory and Geometric Transformation (2019)
Conference Proceeding

Fringe projection measurement techniques offer fast, non-contact measurements of the surface form of manufactured parts at relatively low cost. Recent advances in fringe projection have reduced measurement errors from effects such as multiple surface... Read More about Modelling Fringe Projection Based on Linear Systems Theory and Geometric Transformation.

High-accuracy surface measurement through modelling of the surface transfer function in interference microscopy (2019)
Journal Article

Surfaces featuring complex topographies, such as high slope angles, large curvatures and high aspect-ratio structures on both macro- and micro-scales, present significant challenges to optical measuring instruments. Here we demonstrate a method to ch... Read More about High-accuracy surface measurement through modelling of the surface transfer function in interference microscopy.

Does interferometry work? A critical look at the foundations of interferometric surface topography measurement (2019)
Journal Article

© 2019 SPIE. Interferometers for the measurement of surface form and texture have a reputation for high performance. However, the results for many types of surface features can deviate from the expectation of one cycle of phase shift per half wavelen... Read More about Does interferometry work? A critical look at the foundations of interferometric surface topography measurement.

Three-dimensional resonating metamaterials for low-frequency vibration attenuation (2019)
Journal Article

Recent advances in additive manufacturing have enabled fabrication of phononic crystals and metamaterials which exhibit spectral gaps, or stopbands, in which the propagation of elastic waves is prohibited by Bragg scattering or local resonance effect... Read More about Three-dimensional resonating metamaterials for low-frequency vibration attenuation.

Increasing throughput in x-ray computed tomography measurement of surface topography using sinogram interpolation (2019)
Journal Article

© 2019 Crown copyright. Reproduced with the permission of the Controller of Her Majesty's Stationery Office. X-ray computed tomography (XCT) is a non-destructive imaging technique that has recently gained interest as a tool to measure surface topogra... Read More about Increasing throughput in x-ray computed tomography measurement of surface topography using sinogram interpolation.

Uncertainty evaluation of fringe projection based on the linear systems theory (2019)
Conference Proceeding

Fringe projection techniques offer fast, non-contact measurements of the surface form of manufactured parts. Fringe projection has seen successful implementation in the automotive, aerospace and medical industries. Recently, advances in fringe projec... Read More about Uncertainty evaluation of fringe projection based on the linear systems theory.

Extending the linear regime of coherence scanning interferometry (2019)
Presentation / Conference

Case studies in X ray computed tomography surface texture measurement (2019)
Conference Proceeding

Characterisation Of The Surface Topography Evolution Of An Ink-jet Printed Transparent Fluoroplastic With CSI (2019)
Presentation / Conference

We present the results of an empirical investigation into the evolution of the morphology of an ink jet printed trans parent polymer using coherence scanning interferometry (CSI). CSI is a high precision optical surface measuring technique, which ha... Read More about Characterisation Of The Surface Topography Evolution Of An Ink-jet Printed Transparent Fluoroplastic With CSI.

Mathematical reference standards for validating software for calculating surface texture parameters (2019)
Presentation / Conference

X-ray computed tomography surface topography measurement: industrial case studies (2019)
Presentation / Conference

Modelling of coherence scanning interferometry for complex surfaces based on a boundary element method (2019)
Journal Article

Coherence scanning interferometry (CSI) is a well-established technique for measuring surface topography based on the coherence envelope and phase of interference fringes. The most commonly used surface reconstruction methods, i.e. frequency domain a... Read More about Modelling of coherence scanning interferometry for complex surfaces based on a boundary element method.

Multidimensional Phononic Bandgaps in Three-Dimensional Lattices for Additive Manufacturing (2019)
Journal Article

We report on numerical modelling of three-dimensional lattice structures designed to provide phononic bandgaps. The examined lattice structures rely on two distinct mechanisms for bandgap formation: the destructive interference of elastic waves and i... Read More about Multidimensional Phononic Bandgaps in Three-Dimensional Lattices for Additive Manufacturing.