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Professor RICHARD LEACH's Outputs (83)

Does interferometry work? A critical look at the foundations of interferometric surface topography measurement (2019)
Presentation / Conference Contribution
de Groot, P. J., Colonna de Lega, X., Su, R., & Leach, R. K. (2019, August). Does interferometry work? A critical look at the foundations of interferometric surface topography measurement. Presented at Applied Optical Metrology III, San Diego, United States

© 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.

High-accuracy surface measurement through modelling of the surface transfer function in interference microscopy (2019)
Presentation / Conference Contribution
Su, R., Thomas, M., Liu, M., Coupland, J., & Leach, R. (2019, August). High-accuracy surface measurement through modelling of the surface transfer function in interference microscopy. Presented at Applied Optical Metrology III, San Diego, United States

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.

Uncertainty evaluation of fringe projection based on the linear systems theory (2019)
Presentation / Conference Contribution
Gayton, G., Su, R., Leach, R., & Bradley, L. (2019, July). Uncertainty evaluation of fringe projection based on the linear systems theory. Presented at 35th Annual Coordinate Metrology Society Conference, Orlando, Florida

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.

Case studies in X ray computed tomography surface texture measurement (2019)
Presentation / Conference Contribution
Thompson, A., Senin, N., & Leach, R. (2019, July). Case studies in X ray computed tomography surface texture measurement. Presented at 22nd International Conference on Metrology and Properties of Engineering Surfaces, Lyon, France

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.

Modelling of coherence scanning interferometry for complex surfaces based on a boundary element method (2019)
Presentation / Conference Contribution
Thomas, M., Su, R., Nikolaev, N., Coupland, J., & Leach, R. (2019, June). Modelling of coherence scanning interferometry for complex surfaces based on a boundary element method. Presented at Modeling Aspects in Optical Metrology VII, Munich, Germany

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.

Automated assessment of object coverage in smart, optical form measurement (2019)
Presentation / Conference Contribution
Catalucci, S., Senin, N., Stavroulakis, P., & Leach, R. (2019, June). Automated assessment of object coverage in smart, optical form measurement. Presented at 19th International euspen Conference & Exhibition, Bilbao, Spain

As part of a project to develop a smart 3D form measurement system for quality control of complex 3D parts, we present early work in algorithmic assessment of coverage achieved on the surfaces of a part subjected to optical measurement from a single... Read More about Automated assessment of object coverage in smart, optical form measurement.

All-optical difference engine for in-process defect inspection for roll-to-roll printed electronics (2019)
Presentation / Conference Contribution
Feng, X., Su, R., Happonen, T., Liu, J., & Leach, R. (2018, August). All-optical difference engine for in-process defect inspection for roll-to-roll printed electronics. Presented at 10th International Symposium on Precision Engineering Measurements and Instrumentation (ISPEMI 2018), Kunming, China

© 2019 SPIE. The increasing capabilities of roll-to-roll (R2R) printing processes present challenges for quality control, requiring inprocess inspection of large substrates with high resolution at high speed. In this paper, an all-optical difference... Read More about All-optical difference engine for in-process defect inspection for roll-to-roll printed electronics.

Imaging beyond the fundamental slope limit in surface metrology using fluorophore-aided scattering microscopy (2018)
Presentation / Conference Contribution
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, Paris, France

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.

Verification of a rigorous 2D model of rough surface scattering (2018)
Presentation / Conference Contribution
Thomas, M., Leach, R., Nikolaev, N., Widjanarko, T., Senin, N., Aryan, H., & Coupland, J. Verification of a rigorous 2D model of rough surface scattering. Presented at European Optical Society Biennial Meeting (EOSAM) 2018

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)
Presentation / Conference Contribution
Rivas Santos, V., Sims-Waterhouse, D., Piano, S., Maskery, I., Leach, R., Papastavrou, M., Ellis, A., & Woolliams, P. (2017, October). Metrological design of calibration and benchmarking artefacts for an additive manufacturing system. Presented at Joint Special Interest Group meeting between euspen and ASPE Dimensional Accuracy and Surface Finish in Addictive Manufacturing, Katholieke Universiteit Leuven, Belgium, October 2017

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.