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All Outputs (24)

Laser triangulation (2020)
Book Chapter
Isa, M. A., Piano, S., & Leach, R. Laser triangulation. In R. Leach (Ed.), Advances in Optical Form and Coordinate Metrology. IOP Publishing. https://doi.org/10.1088/978-0-7503-2524-0ch3

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
Karim, S., Piano, S., Branson, D., Santoso, T., Leach, R., & Tolley, M. (2022). Real-time target alignment system for high-power high-repetition rate laser operations using a five degree-of-freedom hybrid mechanism. International Journal of Control, 95(4), 867-885. https://doi.org/10.1080/00207179.2020.1827297

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.

Mathematical approach to the validation of surface texture filtration software (2020)
Journal Article
Todhunter, L., Leach, R., & Blateyron, F. (2020). Mathematical approach to the validation of surface texture filtration software. Surface Topography: Metrology and Properties, 8(4), Article 045017. https://doi.org/10.1088/2051-672X/abc0fb

A novel method for the validation of surface texture filtration software is introduced. Mathematically traceable reference pairs for linear Gaussian filtration are developed, utilising Fourier series surface definitions in conjunction with the freque... Read More about Mathematical approach to the validation of surface texture filtration software.

Mathematical approach to the validation of form removal surface texture software (2020)
Journal Article
Todhunter, L., Leach, R., & Blateyron, F. (2020). Mathematical approach to the validation of form removal surface texture software. Surface Topography: Metrology and Properties, 8(4), Article 045019. https://doi.org/10.1088/2051-672x/abc737

A new approach to the validation of surface texture form removal methods is introduced. A linear algebra technique is presented that obtains total least squares (TLS) model fits for a continuous mathematical surface definition. This model is applicab... Read More about Mathematical approach to the validation of form removal surface texture software.

Optimisation of camera positions for optical coordinate measurement based on visible point analysis (2020)
Journal Article
Zhang, H., Eastwood, J., Isa, M., Sims-Waterhouse, D., Leach, R., & Piano, S. (2021). Optimisation of camera positions for optical coordinate measurement based on visible point analysis. Precision Engineering, 67, 178-188. https://doi.org/10.1016/j.precisioneng.2020.09.016

In optical coordinate measurement using cameras, the number of images, and positions and orientations of the cameras, are critical to object accessibility and the accuracy of a measurement. In this paper, we propose a technique to optimise the number... Read More about Optimisation of camera positions for optical coordinate measurement based on visible point analysis.

Surface-process correlation for an ink-jet printed transparent fluoroplastic (2020)
Journal Article
Gomez, C., Campanelli, C., Su, R., & Leach, R. (2020). Surface-process correlation for an ink-jet printed transparent fluoroplastic. Surface Topography: Metrology and Properties, 8(3), Article 034002. https://doi.org/10.1088/2051-672X/abac1c

Ink-jet printing is one of the key technologies in the field of defined polymer deposition. There is currently a lack of knowledge regarding how some fluoropolymers, in this case THV 221, can be ink-jet printed. A quantitative analysis of the micro-s... Read More about Surface-process correlation for an ink-jet printed transparent fluoroplastic.

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.

Review of the influence of noise in X-ray computed tomography measurement uncertainty (2020)
Journal Article
Sánchez, Á. R., Thompson, A., Körner, L., Brierley, N., & Leach, R. (2020). Review of the influence of noise in X-ray computed tomography measurement uncertainty. Precision Engineering, 66, 382-391. https://doi.org/10.1016/j.precisioneng.2020.08.004

Different aspects of noise in X-ray computed tomography (XCT) for industrial purposes are examined. An overview of the most common noise metrics is given, together with a description of XCT noise influence quantities. We address the current state of... Read More about Review of the influence of noise in X-ray computed tomography measurement uncertainty.

On-machine focus variation measurement for micro-scale hybrid surface texture machining (2020)
Journal Article
Santoso, T., Syam, W. P., Darukumalli, S., Cai, Y., Helmli, F., Luo, X., & Leach, R. (2020). On-machine focus variation measurement for micro-scale hybrid surface texture machining. International Journal of Advanced Manufacturing Technology, 109(9-12), 2353–2364. https://doi.org/10.1007/s00170-020-05767-z

Fast and accurate in-line areal surface topography measuring instruments are required to control the quality of microscale manufactured components, without significantly slowing down the production process. Full-field areal optical surface topography... Read More about On-machine focus variation measurement for micro-scale hybrid surface texture machining.

On-machine surface defect detection using light scattering and deep learning (2020)
Journal Article
Liu, M., Fai Cheung, C., Senin, N., Wang, S., Su, R., & Leach, R. (2020). On-machine surface defect detection using light scattering and deep learning. Journal of the Optical Society of America A, 37(9), B53-B59. https://doi.org/10.1364/josaa.394102

This paper presents an on-machine surface defect detection system using light scattering and deep learning. A supervised deep learning model is used to mine the information related to defects from light scattering patterns. A convolutional neural net... Read More about On-machine surface defect detection using light scattering and deep learning.

Feature-based characterisation of Ti6Al4V electron beam powder bed fusion surfaces fabricated at different surface orientations (2020)
Journal Article
Newton, L., Senin, N., Chatzivagiannis, E., Smith, B., & Leach, R. (2020). Feature-based characterisation of Ti6Al4V electron beam powder bed fusion surfaces fabricated at different surface orientations. Additive Manufacturing, 35, Article 101273. https://doi.org/10.1016/j.addma.2020.101273

Due to the layer-based nature of the powder bed fusion (PBF) process, part surfaces oriented in space at varying angles with respect to the build direction are differently affected by a wide array of manufacturing-induced phenomena (staircase effects... Read More about Feature-based characterisation of Ti6Al4V electron beam powder bed fusion surfaces fabricated at different surface orientations.

Ceria-coated replicated aluminium sponges as catalysts for the CO-water gas shift process (2020)
Journal Article
Palma, V., Goodall, R., Thompson, A., Ruocco, C., Renda, S., Leach, R., & Martino, M. (2021). Ceria-coated replicated aluminium sponges as catalysts for the CO-water gas shift process. International Journal of Hydrogen Energy, 46(22), 12158-12168. https://doi.org/10.1016/j.ijhydene.2020.04.065

A study on the use of chemical conversion coating as a preparative technique for foam-based structured catalysts, in the water gas shift reaction, is presented. The results showed a significant correlation between the textural properties of the struc... Read More about Ceria-coated replicated aluminium sponges as catalysts for the CO-water gas shift process.

Volumetric error modelling of a stereo vision system for error correction in photogrammetric three-dimensional coordinate metrology (2020)
Journal Article
Isa, M. A., Sims-Waterhouse, D., Piano, S., & Leach, R. (2020). Volumetric error modelling of a stereo vision system for error correction in photogrammetric three-dimensional coordinate metrology. Precision Engineering, 64, 188-199. https://doi.org/10.1016/j.precisioneng.2020.04.010

Optical three-dimensional coordinate measurement using stereo vision has systematic errors that affect measurement quality. This paper presents a scheme for measuring, modelling and correcting these errors. The position and orientation of a linear st... Read More about Volumetric error modelling of a stereo vision system for error correction in photogrammetric three-dimensional coordinate metrology.

Cascaded machine learning model for reconstruction of surface topography from light scattering (2020)
Presentation / Conference Contribution
Liu, M., Senin, N., Su, R., & Leach, R. Cascaded machine learning model for reconstruction of surface topography from light scattering. Presented at Optics and Photonics for Advanced Dimensional Metrology, Online Only, France

Light scattering methods are promising for in-process surface measurement. Many researchers have investigated light scattering methods for evaluating surface texture. Researchers working on scatterometry have developed methods to derive surface textu... Read More about Cascaded machine learning model for reconstruction of surface topography from light scattering.

Real-time target alignment system for high-power high-repetition rate laser operations using a five degree-of-freedom hybrid mechanism (2020)
Journal Article
Leach, R., Branson, D., Karim, S., Tolley, M., Piano, S., & Santoso, T. (2020). Real-time target alignment system for high-power high-repetition rate laser operations using a five degree-of-freedom hybrid mechanism. International Journal of Control, 95(4), 867-885. https://doi.org/10.1080/00207179.2020.1827297

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

Optical topography measurement of steeply-sloped surfaces beyond the specular numerical aperture limit (2020)
Presentation / Conference Contribution
Thomas, M., Su, R., de Groot, P., & Leach, R. Optical topography measurement of steeply-sloped surfaces beyond the specular numerical aperture limit. Presented at Optics and Photonics for Advanced Dimensional Metrology, Online Only, France

Engineered functional surfaces often feature varying slopes on macro- and micro-scales. When surfaces are mirror-like, the highest surface slope that can be measured by a far-field 3D imaging optical surface measuring instrument is the arcsine of the... Read More about Optical topography measurement of steeply-sloped surfaces beyond the specular numerical aperture limit.

Metrological characteristics for the calibration of surface topography measuring instruments: a review (2020)
Journal Article
Leach, R. K., Haitjema, H., Su, R., & Thompson, A. (2020). Metrological characteristics for the calibration of surface topography measuring instruments: a review. Measurement Science and Technology, 32(3), Article 032001. https://doi.org/10.1088/1361-6501/abb54f

In this paper, we will review the development and use of an ISO standardised framework to allow calibration of surface topography measuring instruments. We will draw on previous work to present the state of the art in the field in terms of employed m... Read More about Metrological characteristics for the calibration of surface topography measuring instruments: a review.

Modeling of interference microscopy beyond the linear regime (2020)
Journal Article
Thomas, M., Su, R., Nikolaev, N., Coupland, J., & Leach, R. (2020). Modeling of interference microscopy beyond the linear regime. Optical Engineering, 59(3), Article 034110. https://doi.org/10.1117/1.oe.59.3.034110

Coherence scanning interferometry (CSI), a type of interference microscopy, has found broad applications in advanced manufacturing industry providing high-accuracy surface topography measurement. Enhancement of the metrological capability of CSI for... Read More about Modeling of interference microscopy beyond the linear regime.

Noise reduction in coherence scanning interferometry for surface topography measurement (2020)
Journal Article
Gomez, C., Su, R., De Groot, P., & Leach, R. (2020). Noise reduction in coherence scanning interferometry for surface topography measurement. Nanomanufacturing and Metrology, 3, 68–76. https://doi.org/10.1007/s41871-020-00057-4

Coherence scanning interferometry is one of the most accurate surface measuring technology, and it is increasingly applied to challenging surface structures, such as additive manufactured part and transparent films, directly in environments that rese... Read More about Noise reduction in coherence scanning interferometry for surface topography measurement.