All Outputs (45)

Resolution enhancement for topography measurement of high-dynamic-range surfaces via image fusion (2018)
Journal Article
Wang, J., Su, R., Leach, R., Lu, W., Zhou, L., & Jiang, X. (2018). Resolution enhancement for topography measurement of high-dynamic-range surfaces via image fusion. Optics Express, 26(26), 34805-34819. https://doi.org/10.1364/OE.26.034805

In this paper, we introduce a method and algorithm for resolution enhancement of low-resolution surface topography data by fusing it with corresponding high-resolution intensity images. This fusion is carried out by linking the three-dimensional topo... Read More about Resolution enhancement for topography measurement of high-dynamic-range surfaces via image fusion.

Imaging beyond the fundamental slope limit in surface metrology using fluorophore-aided scattering microscopy (2018)
Presentation / Conference
Liu, J., Liu, C., Li, L., Su, R., & Leach, R. (2018, November). Imaging beyond the fundamental slope limit in surface metrology using fluorophore-aided scattering microscopy. Paper presented at Special Interest Group Meeting: Structured & Freeform Surfaces

Topography measurement for smooth surfaces with high slopes, e.g. freeform optics, is a challenging task for optical measuring instruments as the light reflected by the tilted surface cannot be sufficiently collected by the objective, resulting in lo... Read More about Imaging beyond the fundamental slope limit in surface metrology using fluorophore-aided scattering microscopy.

Areal topography measurement of metal additive surfaces using focus variation microscopy (2018)
Journal Article
Newton, L., Senin, N., Gomez, C., Danzl, R., Helmli, F., Blunt, L., & Leach, R. (2019). Areal topography measurement of metal additive surfaces using focus variation microscopy. Additive Manufacturing, 25, 365-389. https://doi.org/10.1016/j.addma.2018.11.013

In this work, the performance of a focus variation instrument for measurement of areal topography of metal additive surfaces was investigated. Samples were produced using both laser and electron beam powder bed fusion processes with some of the most... Read More about Areal topography measurement of metal additive surfaces using focus variation microscopy.

Mechanical vibration bandgaps in surface-based lattices (2018)
Journal Article
Elmadih, W., Syam, W. P., Maskery, I., Chronopoulos, D., & Leach, R. (2019). Mechanical vibration bandgaps in surface-based lattices. Additive Manufacturing, 25, 421-429. https://doi.org/10.1016/j.addma.2018.11.011

In this paper, the phonon dispersion curves of several surface-based lattices are examined, and their energy transmission spectra, along with the corresponding bandgaps are identified. We demonstrate that these bandgaps may be controlled, or tuned, t... Read More about Mechanical vibration bandgaps in surface-based lattices.

Determination of the lateral resolution of an interference microsope using a micro-scale sphere (2018)
Conference Proceeding
Su, R., Thomas, M., De Groot, P., Coupland, J., & Leach, R. (2018). Determination of the lateral resolution of an interference microsope using a micro-scale sphere. In Proceedings of the 33rd Annual Meeting of the American Society for Precision Engineering, Las Vegas, 4-9 November 2018

Calibration and adjustment of a high-precision five degree of freedom hybrid mechanism (2018)
Conference Proceeding
Karim, S., Piano, S., Leach, R., Branson, D., & Tolley, M. (2018). Calibration and adjustment of a high-precision five degree of freedom hybrid mechanism. In Proceedings of the 33rd Annual Meeting of the American Society for Precision Engineering, Las Vegas, 4-9 November 2018

Infidelity and the calibration of optical surface topography measuring instruments (2018)
Conference Proceeding
Leach, R., De Groot, P., & Haitjema, H. (2018). Infidelity and the calibration of optical surface topography measuring instruments. In Proceedings of the 33rd Annual Meeting of the American Society for Precision Engineering, Las Vegas, 4-9 November 2018

Designing low frequency band gaps in additively manufactured parts using internal resonators (2018)
Conference Proceeding
Elmadih, W., Syam, W. P., Maskery, I., & Leach, R. (2018). Designing low frequency band gaps in additively manufactured parts using internal resonators. In Proceedings of the 33rd Annual Meeting of the American Society for Precision Engineering, Las Vegas, 4-9 November 2018

Representing the specification of industrial X-ray computed tomography with amplitude-wavelength space (2018)
Conference Proceeding
Villarraga-Gómez, H., Körner, L., Leach, R., & Smith, S. T. (2018). Representing the specification of industrial X-ray computed tomography with amplitude-wavelength space. In Proceedings of the 33rd Annual Meeting of the American Society for Precision Engineering, Las Vegas, 4-9 November 2018

Rapid tracking of extrinsic projector parameters in fringe projection using machine learning (2018)
Journal Article
Stavroulakis, P., Chen, S., Delorme, C., Bointon, P., Tzimiropoulos, G., & Leach, R. (2019). Rapid tracking of extrinsic projector parameters in fringe projection using machine learning. Optics and Lasers in Engineering, 114, 7-14. https://doi.org/10.1016/j.optlaseng.2018.08.018

In this work, we propose to enable the angular re-orientation of a projector within a fringe projection system in real-time without the need for re-calibrating the system. The estimation of the extrinsic orientation parameters of the projector is per... Read More about Rapid tracking of extrinsic projector parameters in fringe projection using machine learning.

Verification of a rigorous 2D model of rough surface scattering (2018)
Conference Proceeding
Thomas, M., Leach, R., Nikolaev, N., Widjanarko, T., Senin, N., Aryan, H., & Coupland, J. (2018). Verification of a rigorous 2D model of rough surface scattering.

A rigorous two-dimensional (2D) model of electromagnetic surface scatter has been developed, based on a boundary element method (BEM) established by Simonsen [1]. Simulated far-field scatter is compared to that measured from a laser scatterometer for... Read More about Verification of a rigorous 2D model of rough surface scattering.

Metrological design of calibration and benchmarking artefacts for an additive manufacturing system (2018)
Conference Proceeding
Rivas Santos, V., Sims-Waterhouse, D., Piano, S., Maskery, I., Leach, R., Papastavrou, M., …Woolliams, P. (2018). Metrological design of calibration and benchmarking artefacts for an additive manufacturing system

Development of mathematical reference standards for the validation of surface texture parameter calculation software (2018)
Conference Proceeding
Todhunter, L., Leach, R., Lawes, S., Blateyron, F., & Harris, P. (2018). Development of mathematical reference standards for the validation of surface texture parameter calculation software. In n/a

A framework for the validation of surface texture parameter calculation software is proposed. The framework utilises mathematically defined surfaces and mathematically calculated surface texture parameter values to produce a reference against which t... Read More about Development of mathematical reference standards for the validation of surface texture parameter calculation software.

In-process measurement of the surface quality for a novel finishing process for polymer additive manufacturing (2018)
Journal Article
Syam, W. P., Leach, R., Rybalcenko, K., Gaio, A., & Crabtree, J. (2018). In-process measurement of the surface quality for a novel finishing process for polymer additive manufacturing. Procedia CIRP, 75, 108-113. https://doi.org/10.1016/j.procir.2018.04.088

In the last decade, there has been considerable growth in the production of end-use polymer parts and components using additive manufacturing methods. A wide range of polymers, from Nylon-12 to thermoplastic polyurethane polymers, can be processed wi... Read More about In-process measurement of the surface quality for a novel finishing process for polymer additive manufacturing.

Information-rich surface metrology (2018)
Journal Article
Senin, N., & Leach, R. K. (2018). Information-rich surface metrology. Procedia CIRP, 75, 19-26. https://doi.org/10.1016/j.procir.2018.05.003

Information-rich metrology refers to the incorporation of any type of available information in the data acquisition and processing pipeline of a measurement process, in order to improve the efficiency and quality of the measurement. In this work, the... Read More about Information-rich surface metrology.

An interlaboratory comparison of X-ray computed tomography measurement for texture and dimensional characterisation of additively manufactured parts (2018)
Journal Article
Townsend, A., Racasan, R., Leach, R., Senin, N., Thompson, A., Ramsey, A., …Blunt, L. (2018). An interlaboratory comparison of X-ray computed tomography measurement for texture and dimensional characterisation of additively manufactured parts. Additive Manufacturing, 23, 422-432. https://doi.org/10.1016/j.addma.2018.08.013

This paper presents the results of the CT-STARR (CT-Surface Texture for Additive Round Robin) Stage 1 interlaboratory comparison. The study compared the results obtained for the extraction of areal surface texture data per ISO 25178-2 from five X-ray... Read More about An interlaboratory comparison of X-ray computed tomography measurement for texture and dimensional characterisation of additively manufactured parts.

Artificial intelligence-enhanced multi-material form measurement for additive materials (2018)
Presentation / Conference
Stavroulakis, P., Davies, O., Shaheen, A., & Leach, R. (2018, August). Artificial intelligence-enhanced multi-material form measurement for additive materials. Paper presented at Solid Freeform Fabrication Symposium

Curvature-based segmentation of powder bed point clouds for in-process monitoring (2018)
Conference Proceeding
Chung Chee Law, A., Southon, N., Senin, N., Stavroulakis, P., Leach, R., Goodridge, R., & Kong, Z. (2018). Curvature-based segmentation of powder bed point clouds for in-process monitoring. In 29th Annual International Solid Freeform Fabrication Symposium - an Additive Manufacturing Conference 2018

This paper presents a curvature-based analysis of point clouds collected in-process with fringe projection in a polymer powder bed fusion process. The three-dimensional point clouds were obtained from outside of the build chamber with a fringe projec... Read More about Curvature-based segmentation of powder bed point clouds for in-process monitoring.

Correlating volume and surface features in additively manufactured metal parts (2018)
Conference Proceeding
Thompson, A., Tammas-Williams, S., Senin, N., Todd, I., & Leach, R. (2018). Correlating volume and surface features in additively manufactured metal parts.

In-process measurement and monitoring of a polymer laser sintering powder bed with fringe projection (2018)
Journal Article
Southon, N., Stavroulakis, P., Goodridge, R., & Leach, R. (2018). In-process measurement and monitoring of a polymer laser sintering powder bed with fringe projection. Materials and Design, 157, 227-234. https://doi.org/10.1016/j.matdes.2018.07.053

We investigate the feasibility of using fringe projection to monitor the powder bed of a polyamide 12 polymer laser sintering machine. In particular, we demonstrate the ability of fringe projection to identify a number of defects arising during the p... Read More about In-process measurement and monitoring of a polymer laser sintering powder bed with fringe projection.