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All Outputs (33)

Multi-view fringe projection system for surface topography measurement during metal powder bed fusion (2020)
Journal Article
Dickins, A., Widjanarko, T., Sims-Waterhouse, D., Thompson, A., Lawes, S., Senin, N., & Leach, R. (2020). Multi-view fringe projection system for surface topography measurement during metal powder bed fusion. Journal of the Optical Society of America A, 37(9), B93-B105. https://doi.org/10.1364/JOSAA.396186

Metal powder bed fusion (PBF) methods need in-process measurement methods to increase user confidence and encourage further adoption in high-value manufacturing sectors. In this paper, a novel measurement method for PBF systems is proposed that uses... Read More about Multi-view fringe projection system for surface topography measurement during metal powder bed fusion.

Mathematical approach to the validation of field surface texture parameter software (2020)
Journal Article
Todhunter, L., Leach, R., Lawes, S., Harris, P., & Blateyron, F. (2020). Mathematical approach to the validation of field surface texture parameter software. Surface Topography: Metrology and Properties, 8(1), Article 015010. https://doi.org/10.1088/2051-672x/ab7367

A new method for performance validation of surface texture parameter calculation software is introduced, focussing on field surface texture parameters. Surface height functions are defined mathematically, either using Fourier series or polynomials, a... Read More about Mathematical approach to the validation of field surface texture parameter software.

Comparison of two noise reduction methods in coherence scanning interferometry for surface measurement (2019)
Presentation / Conference Contribution
Gomez, C., Su, R., Lawes, S., & Leach, R. (2019, September). Comparison of two noise reduction methods in coherence scanning interferometry for surface measurement. Presented at 14th International Symposium of Measurement Technology and Intelligent Instruments (ISMTII2019), Niigata, Japan

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.

Increasing throughput in x-ray computed tomography measurement of surface topography using sinogram interpolation (2019)
Journal Article
Körner, L., Lawes, S., Bate, D., Newton, L., Senin, N., & Leach, R. K. (2019). Increasing throughput in x-ray computed tomography measurement of surface topography using sinogram interpolation. Measurement Science and Technology, 30(12), Article 125002. https://doi.org/10.1088/1361-6501/ab37e5

© 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.

Characterisation Of The Surface Topography Evolution Of An Ink-jet Printed Transparent Fluoroplastic With CSI (2019)
Presentation / Conference Contribution
Gomez, C., Campanelli, C., Su, R., Lawes, S., & Leach, R. (2019, July). Characterisation Of The Surface Topography Evolution Of An Ink-jet Printed Transparent Fluoroplastic With CSI. Poster presented at 22nd International Conference on Metrology & Properties of Surfaces, Lyon, France

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 approach to the validation of functional surface texture parameter software (2019)
Journal Article
Todhunter, L., Leach, R., Lawes, S., Harris, P., & Blateyron, F. (2019). Mathematical approach to the validation of functional surface texture parameter software. Surface Topography: Metrology and Properties, 7(1), Article 015020. https://doi.org/10.1088/2051-672X/ab07ca

A new method for performance validation of surface texture parameter calculation software is introduced, focussing on functional surface texture parameters. Material ratio curves are defined algebraically and used to calculate functional surface text... Read More about Mathematical approach to the validation of functional surface texture parameter software.

Development of mathematical reference standards for the validation of surface texture parameter calculation software (2018)
Presentation / Conference Contribution
Todhunter, L., Leach, R., Lawes, S., Blateyron, F., & Harris, P. (2018, September). Development of mathematical reference standards for the validation of surface texture parameter calculation software. Presented at XII World Congress of the International Measurement Confederation (IMEKO)

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.

Design of a multi-sensor in-situ inspection system for additive manufacturing (2018)
Presentation / Conference Contribution
Dickins, A., Widjanarko, T., Lawes, S., Stravroulakis, P., & Leach, R. (2018, July). Design of a multi-sensor in-situ inspection system for additive manufacturing. Presented at ASPE/euspen Special Interest Group Meeting: Additive Manufacturing, Berkeley, California, USA

A programmable software framework for the generation of simulated surface topography (2018)
Presentation / Conference Contribution
Todhunter, L. D., Senin, N., Leach, R., Lawes, S., Blateyron, F., & Harris, P. A programmable software framework for the generation of simulated surface topography. Presented at euspen 18th International Conference & Exhibition

A flexible and programmable software framework has been developed that enables the creation of simulated, areal surface topography datasets. The framework allows the creation of surfaces through a layered approach where deterministic topographic stru... Read More about A programmable software framework for the generation of simulated surface topography.

Internal surface measurement of metal powder bed fusion parts (2018)
Journal Article
Thompson, A., Senin, N., Maskery, I., Körner, L., Lawes, S., & Leach, R. (2018). Internal surface measurement of metal powder bed fusion parts. Additive Manufacturing, 20, https://doi.org/10.1016/j.addma.2018.01.003

Recent advances in X-ray computed tomography (XCT) have allowed for measurement resolutions approaching the point where XCT can be used for measuring surface topography. These advances make XCT appealing for measuring hard-to-reach or internal surfac... Read More about Internal surface measurement of metal powder bed fusion parts.

Development of mathematically-defined surfaces (2017)
Presentation / Conference Contribution
Todhunter, L. D., Leach, R., Lawes, S., Harris, P., & Blateyron, F. (2017, October). Development of mathematically-defined surfaces. Presented at Postgraduate Institute Conference 2017

New software has been developed that enables the creation of areal surface topography representations. The goal of this software package is to utilise the mathematically-defined surface representations in the development of surface texture parameter... Read More about Development of mathematically-defined surfaces.

Optimisation of surface topography characterisation for metal additive manufacturing using coherence scanning interferometry (2017)
Presentation / Conference Contribution
Gómez, C. A., Su, R., Thompson, A., DiSciacca, J., Lawes, S., & Leach, R. K. Optimisation of surface topography characterisation for metal additive manufacturing using coherence scanning interferometry. Presented at Joint Special Interest Group meeting between euspen and ASPE Dimensional Accuracy and Surface Finish in Additive Manufacturing

The surface topography of metal additive manufactured (AM) parts can be challenging to measure due to the presence of complex features, such as high slopes, step like recesses and protuberances, and local variations in reflectance. Recent innovations... Read More about Optimisation of surface topography characterisation for metal additive manufacturing using coherence scanning interferometry.

True-color 3D surface metrology for additive manufacturing using interference microscopy (2017)
Presentation / Conference Contribution
DiSciacca, J., Gomez, C., Thompson, A., Lawes, S., Leach, R., Colonna de Lega, X., & de Groot, P. True-color 3D surface metrology for additive manufacturing using interference microscopy. Presented at Joint Special Interest Group meeting between euspen and ASPE Dimensional Accuracy and Surface Finish in Additive Manufacturing

Coherence scanning interferometry (CSI) is widely used for surface topography characterisation. With the ability to measure both rough surfaces with the high slopes and optical finishes, CSI has made contibutions in fields from industrial machining t... Read More about True-color 3D surface metrology for additive manufacturing using interference microscopy.

A microscopy approach for in situ inspection of the μCMM stylus for contamination (2017)
Journal Article
Feng, X., Pascal, J., & Lawes, S. (in press). A microscopy approach for in situ inspection of the μCMM stylus for contamination. Measurement Science and Technology, 28(9), https://doi.org/10.1088/1361-6501/aa7c93

During the µCMM measurement process, contamination gradually builds up on the surface of the stylus tip and affects dimensional accuracy of the measurement. Regular inspection of the stylus for contamination is essential in determining the appropriat... Read More about A microscopy approach for in situ inspection of the μCMM stylus for contamination.

Optimization of surface measurement for metal additive manufacturing using coherence scanning interferometry (2017)
Journal Article
Gomez, C., Su, R., Thompson, A., DiSciacca, J., Lawes, S., & Leach, R. K. (2017). Optimization of surface measurement for metal additive manufacturing using coherence scanning interferometry. Optical Engineering, 56(11), 1-8. https://doi.org/10.1117/1.OE.56.11.111714

Surface topography measurement for metal additive manufacturing (AM) is a challenging task for contact and non-contact methods. In this paper, we present an experimental investigation of the use of coherence scanning interferometry (CSI) for measurem... Read More about Optimization of surface measurement for metal additive manufacturing using coherence scanning interferometry.