All Outputs (196)

Measurement of laser powder bed fusion surfaces with light scattering and unsupervised machine learning (2022)
Journal Article

Quality monitoring for laser powder bed fusion (L-PBF), particularly in-process and real-time monitoring, is of importance for part quality assurance and manufacturing cost reduction. Measurement of layer surface topography is critical for quality mo... Read More about Measurement of laser powder bed fusion surfaces with light scattering and unsupervised machine learning.

Optical metrology for digital manufacturing: a review (2022)
Journal Article

With the increasing adoption of Industry 4.0, optical metrology has experienced a significant boom in its implementation, as an ever-increasing number of manufacturing processes are overhauled for in-process measurement and control. As such, optical... Read More about Optical metrology for digital manufacturing: a review.

The Effect of Motion Blur on Photogrammetric Measurements of a Robotic Moving Target (2021)
Conference Proceeding

Generation and categorisation of surface texture data using a modified progressively growing adversarial network (2021)
Journal Article

As machine learning becomes more popular in the precision engineering sector, the need for large datasets of measurement data increases. Due to the often manual, user dependent and labour-intensive measurement processes, collecting a large amount of... Read More about Generation and categorisation of surface texture data using a modified progressively growing adversarial network.

Surface measuring coherence scanning interferometry beyond the specular reflection limit (2021)
Journal Article

The capability of optical surface topography measurement methods for measurement of steep and tilted surfaces is investigated through modelling of a coherence scanning interferometer. Of particular interest is the effect on the interference signal an... Read More about Surface measuring coherence scanning interferometry beyond the specular reflection limit.

Development of a compact focus variation microscopy sensor for on-machine surface topography measurement (2021)
Journal Article

On-machine areal surface topography measuring instruments are required for fast and accurate measurement of parts inside production machines without reducing production rates. This paper presents the design and development of a compact focus variatio... Read More about Development of a compact focus variation microscopy sensor for on-machine surface topography measurement.

Low thermal expansion machine frame designs using lattice structures (2021)
Journal Article

In this work, we investigated tessellating cellular (or lattice) structures for use in a low thermal expansion machine frame. We proposed a concept for a lattice structure with tailorable effective coefficient of thermal expansion (CTE). The design i... Read More about Low thermal expansion machine frame designs using lattice structures.

Finite element modelling of defects in additively manufactured strut-based lattice structures (2021)
Journal Article

Strut-based lattice structures produced by powder bed fusion are prone to characteristic manufacturing defects that alter both their form and surface texture. Most studies in the literature focus on a subset of commonly observed defects, typically ra... Read More about Finite element modelling of defects in additively manufactured strut-based lattice structures.

Fourier optics modelling of coherence scanning interferometers (2021)
Conference Proceeding

We propose an instrument model for coherence scanning interferometry using familiar Fourier optics methods, the spectrum of plane waves, and the assumption that the light source spectral bandwidth is the dominant factor in determining fringe contrast... Read More about Fourier optics modelling of coherence scanning interferometers.

Efficient empirical determination of maximum permissible error in coordinate metrology (2021)
Journal Article

Maximum permissible errors (MPEs) are an important measurement system specification and form the basis of periodic verification of a measurement system's performance. However, there is no standard methodology for determining MPEs, so when they are no... Read More about Efficient empirical determination of maximum permissible error in coordinate metrology.

Evaluating and propagating uncertainty in digital fringe projection systems (2021)
Journal Article

Fringe projection is a measurement technique able to produce high-density data measurements of Lambertian surfaces using a camera and projector. Evaluating the uncertainty of a fringe projection system is challenging because of the highdensity and th... Read More about Evaluating and propagating uncertainty in digital fringe projection systems.

Automated assessment of measurement quality in optical coordinate metrology of complex freeform parts (2021)
Conference Proceeding

The measurement of complex freeform geometries represents a fundamental challenge for quality assurance in the production of high value-added parts, in particular when additive manufacturing technologies are involved. In addition, the increasing adva... Read More about Automated assessment of measurement quality in optical coordinate metrology of complex freeform parts.

Physics-based virtual coherence scanning interferometer for surface measurement (2021)
Journal Article

Virtual instruments provide task-specific uncertainty evaluation in surface and dimensional metrology. We demonstrate the first virtual coherence scanning interferometer that can accurately predict the results from measurements of surfaces with compl... Read More about Physics-based virtual coherence scanning interferometer for surface measurement.

Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample (2021)
Journal Article

To investigate the tribological interaction and wear mechanisms of polytetrafluoroethylene-lined radial lip oil seals in service, a sleeve, seal and lubricant sample taken off a rotating rig are studied. The test was terminated at 72 h, after severe... Read More about Analysis of the tribological interaction of a polytetrafluoroethylene-lined radial lip oil seal, shaft and lubricant sample.

Evaluating the cytotoxicity of Ge–Sb–Se chalcogenide glass optical fibres on 3T3 mouse fibroblasts (2021)
Journal Article

In vivo cancer detection based on the mid-infrared molecular fingerprint of tissue is promising for the fast diagnosis and treatment of suspected cancer patients. Few materials are mid-infrared transmissive, even fewer, which can be converted into fu... Read More about Evaluating the cytotoxicity of Ge–Sb–Se chalcogenide glass optical fibres on 3T3 mouse fibroblasts.

Characterisation of a multi-view fringe projection system based on the stereo matching of rectified phase maps (2021)
Journal Article

Multi-view fringe projection systems can be effective solutions to address the limitations imposed by the limited field of view, line-of-sight issues and occlusions when measuring the geometry of complex objects, associated with single camera-projec... Read More about Characterisation of a multi-view fringe projection system based on the stereo matching of rectified phase maps.

Scattering and three-dimensional imaging in surface topography measuring interference microscopy (2021)
Journal Article

Statistical point cloud model to investigate measurement uncertainty in coordinate metrology (2021)
Journal Article

In this work an approach to investigate measurement uncertainty in coordinate metrology is presented, based on fitting Gaussian random fields to high-density point clouds produced by measurement repeats. The fitted field delivers a depiction of the s... Read More about Statistical point cloud model to investigate measurement uncertainty in coordinate metrology.

Laser triangulation (2020)
Book Chapter

This chapter gives a summary of laser triangulation as a measurement technique and outlines recent applications and challenges.

Real-time target alignment system for high-power high-repetition rate laser operations using a five degree-of-freedom hybrid mechanism (2020)
Journal Article

This paper presents a real-time position control solution for the targets used in the high-repetition rate laser operations of large-scale high-power laser facilities. The design of the control system is based on an Abbe-compliant, in-process positio... Read More about Real-time target alignment system for high-power high-repetition rate laser operations using a five degree-of-freedom hybrid mechanism.