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Aerial wetting contact angle measurement using confocal microscopy (2016)
Journal Article
Chesna, J. W., Wiedmaier, B. F., Wang, J., Samara, A., Leach, R. K., Her, T., & Smith, S. T. (in press). Aerial wetting contact angle measurement using confocal microscopy. Measurement Science and Technology, 27(12), https://doi.org/10.1088/0957-0233/27/12/125202

A method is presented in which the wetting contact angle of a sessile drop is acquired aerially using confocal techniques to measure the radius and the height of a droplet deposited on a planar surface. The repeatability of this method is typically l... Read More about Aerial wetting contact angle measurement using confocal microscopy.

Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture (2016)
Journal Article
Hirsch, M., Patel, R., Li, W., Guan, G., Leach, R. K., Sharples, S. D., & Clare, A. T. (2017). Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture. Additive Manufacturing, 13, 135-142. https://doi.org/10.1016/j.addma.2016.10.004

Unlike more established subtractive or constant volume manufacturing technologies, additive manufacturing methods suffer from a lack of in-situ monitoring methodologies which can provide informationrelating to process performance and the formation of... Read More about Assessing the capability of in-situ nondestructive analysis during layer based additive manufacture.

Study of weighted fusion methods for the measurement of surface geometry (2016)
Journal Article
Wang, J., Pagani, L., Leach, R. K., Zeng, W., Colosimo, B. M., & Zhou, L. (2017). Study of weighted fusion methods for the measurement of surface geometry. Precision Engineering, 47, 111-121. https://doi.org/10.1016/j.precisioneng.2016.07.012

© 2016 Elsevier Inc. Four types of weighted fusion methods, including pixel-level, least-squares, parametrical and non-parametrical, have been classified and theoretically analysed in this study. In particular, the uncertainty propagation of the weig... Read More about Study of weighted fusion methods for the measurement of surface geometry.

Quadrature wavelength scanning interferometry (2016)
Journal Article
Moschetti, G., Forbes, A., Leach, R. K., Jiang, X., & O’Connor, D. (2016). Quadrature wavelength scanning interferometry. Applied Optics, 55(20), 5332-5340. https://doi.org/10.1364/ao.55.005332

A novel method to double the measurement range of wavelength scanning interferometry (WSI) is described. In WSI the measured optical path difference (OPD) is affected by a sign ambiguity, i.e. from an interference signal it is not possible to disting... Read More about Quadrature wavelength scanning interferometry.

Loose powder detection and surface characterization in selective laser sintering via optical coherence tomography (2016)
Journal Article
Guan, G., Hirsch, M., Syam, W. P., Leach, R. K., Huang, Z., & Clare, A. T. (2016). Loose powder detection and surface characterization in selective laser sintering via optical coherence tomography. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 472(2191), Article 20160201. https://doi.org/10.1098/rspa.2016.0201

Defects produced during selective laser sintering (SLS) are difficult to non-destructively detect after build completion without the use of X-ray-based methods. Overcoming this issue by assessing integrity on a layer-by-layer basis has become an area... Read More about Loose powder detection and surface characterization in selective laser sintering via optical coherence tomography.

Phase and fringe order determination in wavelength scanning interferometry (2016)
Journal Article
Moschetti, G., Forbes, A., Leach, R. K., Jiang, X., & O'Connor, D. (2016). Phase and fringe order determination in wavelength scanning interferometry. Optics Express, 24(8), 8997-9012. https://doi.org/10.1364/OE.24.008997

A method to obtain unambiguous surface height measurements using wavelength scanning interferometry with an improved repeatability, comparable to that obtainable using phase shifting interferometry, is reported. Rather than determining the conventio... Read More about Phase and fringe order determination in wavelength scanning interferometry.

An international comparison of surface texture parameters quantification on polymer artefacts using optical instruments (2016)
Journal Article
Tosello, G., Haitjema, H., Leach, R. K., Quagliotti, D., Gasparin, S., & Hansen, H. (in press). An international comparison of surface texture parameters quantification on polymer artefacts using optical instruments. CIRP Annals - Manufacturing Technology, 65(1), https://doi.org/10.1016/j.cirp.2016.04.003

An international comparison of optical instruments measuring polymer surfaces with arithmetic mean height values in the sub-micrometre range has been carried out. The comparison involved sixteen optical surface texture instruments (focus variation in... Read More about An international comparison of surface texture parameters quantification on polymer artefacts using optical instruments.

Quantification and characterisation of porosity in selectively laser melted Al–Si10–Mg using x-ray computed tomography (2016)
Journal Article
Maskery, I., Aboulkhair, N., Corfield, M., Tuck, C., Clare, A., Leach, R. K., …Hague, R. J. (2016). Quantification and characterisation of porosity in selectively laser melted Al–Si10–Mg using x-ray computed tomography. Materials Characterization, 111, https://doi.org/10.1016/j.matchar.2015.12.001

We used X-ray computed tomography (CT), microscopy and hardness measurements to study Al–Si10–Mg produced by selective laser melting (SLM). Specimens were subject to a series of heat treatments including annealing and precipitation hardening. The spe... Read More about Quantification and characterisation of porosity in selectively laser melted Al–Si10–Mg using x-ray computed tomography.