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Outputs (61)

High-accuracy robotic metrology for precise industrial manipulation tasks (2023)
Conference Proceeding
Isa, M. A., Khanesar, M. A., Leach, R. K., Branson, D., & Piano, S. (2023). High-accuracy robotic metrology for precise industrial manipulation tasks. . https://doi.org/10.1117/12.2673088

The majority of industrial production processes can be divided into a series of object manipulation and handling tasks that can be adapted for robots. Through significant advances in compliant grasping, sensing and actuation technologies, robots are... Read More about High-accuracy robotic metrology for precise industrial manipulation tasks.

Comparison of coherence scanning interferometry, focus variation and confocal microscopy for surface topography measurement (2023)
Conference Proceeding
Hooshmand, H., Liu, M., Pappas, A., Thompson, A., Leach, R., & Piano, S. (2023). Comparison of coherence scanning interferometry, focus variation and confocal microscopy for surface topography measurement.

The most common optical technologies for surface topography measurement are coherence scanning interferometry (CSI), focus variation microscopy (FV) and imaging confocal microscopy (CM). Due to the benefits and drawbacks of each, these instruments ar... Read More about Comparison of coherence scanning interferometry, focus variation and confocal microscopy for surface topography measurement.

Quantifying the validity conditions of the Beckmann-Kirchhoff scattering model (2022)
Conference Proceeding
Hooshmand, H., Liu, M., Leach, R., & Piano, S. (2022). Quantifying the validity conditions of the Beckmann-Kirchhoff scattering model. In D. Kim, H. Choi, & H. Ottevaere (Eds.), Proc. SPIE 12221, Optical Manufacturing and Testing XIV. https://doi.org/10.1117/12.2639003

Approximate and rigorous methods are widely used to model light scattering from a surface. The boundary element method (BEM) is a rigorous model that accounts for polarisation and multiple scattering effects. BEM is suitable to model the scattered li... Read More about Quantifying the validity conditions of the Beckmann-Kirchhoff scattering model.

Frequency scanning interferometry for accurate robot position measurement (2022)
Conference Proceeding
Isa, M. A., Khanesar, M. A., Leach, R., Branson, D., & Piano, S. (2022). Frequency scanning interferometry for accurate robot position measurement. In Proceedings of 22nd International Conference & Exhibition

This paper presents a frequency scanning interferometry (FSI) shortwave infrared (IR) setup developed for position and orientation measurement of industrial robots. Within contemporary and future industrial frameworks, robots—in particular collaborat... Read More about Frequency scanning interferometry for accurate robot position measurement.

Fourier optics modelling of coherence scanning interferometers (2021)
Conference Proceeding
de Groot, P. J., Colonna de Lega, X., Su, R., Coupland, J., & Leach, R. K. (2021). Fourier optics modelling of coherence scanning interferometers. In SPIE OPTICAL ENGINEERING + APPLICATIONS. https://doi.org/10.1117/12.2595668

We propose an instrument model for coherence scanning interferometry using familiar Fourier optics methods, the spectrum of plane waves, and the assumption that the light source spectral bandwidth is the dominant factor in determining fringe contrast... Read More about Fourier optics modelling of coherence scanning interferometers.

Automated assessment of measurement quality in optical coordinate metrology of complex freeform parts (2021)
Conference Proceeding
Catalucci, S., Senin, N., Piano, S., & Leach, R. (2021). Automated assessment of measurement quality in optical coordinate metrology of complex freeform parts. In Conference Proceedings: 21st International Conference & Exhibition

The measurement of complex freeform geometries represents a fundamental challenge for quality assurance in the production of high value-added parts, in particular when additive manufacturing technologies are involved. In addition, the increasing adva... Read More about Automated assessment of measurement quality in optical coordinate metrology of complex freeform parts.

Automated characterisation of multi-view fringe projection system for three- dimensional measurement of additively manufactured parts (2019)
Conference Proceeding
Leach, R. K., Shaheen, A., Piano, S., Sims-Waterhouse, D., & Bointon, P. (2019). Automated characterisation of multi-view fringe projection system for three- dimensional measurement of additively manufactured parts

Digital fringe projection is a non-contact method that is widely used for the dimensional characterisation of complex manufactured parts. However, single camera-projector fringe projection systems struggle to acquire the full three-dimensional point... Read More about Automated characterisation of multi-view fringe projection system for three- dimensional measurement of additively manufactured parts.

Comparison of two noise reduction methods in coherence scanning interferometry for surface measurement (2019)
Conference Proceeding
Gomez, C., Su, R., Lawes, S., & Leach, R. (2019). Comparison of two noise reduction methods in coherence scanning interferometry for surface measurement

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.

Modelling Fringe Projection Based on Linear Systems Theory and Geometric Transformation (2019)
Conference Proceeding
Gayton, G., Su, R., & Leach, R. (2019). Modelling Fringe Projection Based on Linear Systems Theory and Geometric Transformation

Fringe projection measurement techniques offer fast, non-contact measurements of the surface form of manufactured parts at relatively low cost. Recent advances in fringe projection have reduced measurement errors from effects such as multiple surface... Read More about Modelling Fringe Projection Based on Linear Systems Theory and Geometric Transformation.

Uncertainty evaluation of fringe projection based on the linear systems theory (2019)
Conference Proceeding
Gayton, G., Su, R., Leach, R., & Bradley, L. (2019). Uncertainty evaluation of fringe projection based on the linear systems theory

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.

Automated assessment of object coverage in smart, optical form measurement (2019)
Conference Proceeding
Catalucci, S., Senin, N., Stavroulakis, P., & Leach, R. (2019). Automated assessment of object coverage in smart, optical form measurement. In Proceedings of 19th International euspen Conference & Exhibition

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.

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.

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.

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.

A programmable software framework for the generation of simulated surface topography (2018)
Conference Proceeding
Todhunter, L. D., Senin, N., Leach, R., Lawes, S., Blateyron, F., & Harris, P. (2018). A programmable software framework for the generation of simulated surface topography.

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.

Development of an X-ray simulator: from STTL file to grey scale image (2018)
Conference Proceeding
Korner, L., Leach, R., & Lawes, S. (2018). Development of an X-ray simulator: from STTL file to grey scale image. In Proceedings of the 18th International conference of the European Society for Precision Engineering and Nanotechnology (euspen), 503-504

The effects of vibration on fringe projection systems (2018)
Conference Proceeding
Bointon, P., Todhunter, L., Stavroulakis, P., Clare, A., & Leach, R. (2018). The effects of vibration on fringe projection systems.

Mechanical vibration noise is a significant source of error in precision measuring instruments. Errors due to vibration can be detected in measurement signals, and so methods to control mechanical vibration must be considered throughout the design pr... Read More about The effects of vibration on fringe projection systems.

Lateral error compensation for focus variation microscopy (2018)
Conference Proceeding
Pérez, P., Syam, W. P., Albajez, J. A., Santolaria, J., & Leach, R. (2018). Lateral error compensation for focus variation microscopy.

Focus variation microscopy measures both the areal form and areal surface texture of components. Improvements to the accuracy and precision of focus variation microscopes usually requires measurements with multiple image-fields to compensate lateral... Read More about Lateral error compensation for focus variation microscopy.

Development of mathematically-defined surfaces (2017)
Conference Proceeding
Todhunter, L. D., Leach, R., Lawes, S., Harris, P., & Blateyron, F. (2017). Development of mathematically-defined surfaces.

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.

Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing (2017)
Conference Proceeding
Xu, Z., Hyde, C. J., Thompson, A., Leach, R. K., Maskery, I., Tuck, C., & Clare, A. T. (2017). Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing.

The mechanical performance of additively manufactured (AM) components remains an issue, limiting the implementation of AM technologies. In this work, a new method is presented, to examine the evolution of defects in an Inconel 718 two-bar test specim... Read More about Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing.

True-color 3D surface metrology for additive manufacturing using interference microscopy (2017)
Conference Proceeding
DiSciacca, J., Gomez, C., Thompson, A., Lawes, S., Leach, R., Colonna de Lega, X., & de Groot, P. (2017). True-color 3D surface metrology for additive manufacturing using interference microscopy.

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.

Optimisation of surface topography characterisation for metal additive manufacturing using coherence scanning interferometry (2017)
Conference Proceeding
Gómez, C. A., Su, R., Thompson, A., DiSciacca, J., Lawes, S., & Leach, R. K. (2017). Optimisation of surface topography characterisation for metal additive manufacturing using coherence scanning interferometry.

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.

Feature-based characterisation of laser powder bed fusion surfaces (2017)
Conference Proceeding
Senin, N., Thompson, A., & Leach, R. K. (2017). Feature-based characterisation of laser powder bed fusion surfaces.

A novel algorithmic pipeline for the automated identification and dimensional/geometric characterisation of topographic formations of interest (surface features) is proposed, specifically aimed at the investigation of signature features left by laser... Read More about Feature-based characterisation of laser powder bed fusion surfaces.

The application of composite through-thickness assessment to additively manufactured structures (2017)
Conference Proceeding
Bitar, I., Aboulkhair, N., & Leach, R. (2017). The application of composite through-thickness assessment to additively manufactured structures. In Solid Freeform Fabrication 2017: Proceedings of the 28th Annual International Solid Freeform Fabrication Symposium – An Additive Manufacturing Conference (616-632)

This study looks into the applicability of through-thickness assessment to additive manufacturing (AM) carbon-fibre reinforced polymers (CFRPs). The study utilised a material extrusion printer that uses fused filament fabrication and composite filame... Read More about The application of composite through-thickness assessment to additively manufactured structures.

Results of an industrial survey on the use of surface texture parameters (2017)
Conference Proceeding
Todhunter, L. D., Leach, R., & Lawes, S. (2017). Results of an industrial survey on the use of surface texture parameters.

In 1999, CIRP conducted an industrial survey of the use of surface texture parameters [1]. In the seventeen years since, much has changed, with the most important advancement being the introduction of areal surface texture parameters as described in... Read More about Results of an industrial survey on the use of surface texture parameters.

Design of mechanically-optimised lattice structures for vibration isolation (2017)
Conference Proceeding
Syam, W. P., Jianwei, W., Zhao, B., Maskery, I., & Leach, R. K. (2017). Design of mechanically-optimised lattice structures for vibration isolation.

In this study, we investigate the use of additively manufactured strut-based lattice structures to enhance the mechanical vibration isolation properties of a structure. Three lattice designs, inspired by the common strut-based lattice structures, are... Read More about Design of mechanically-optimised lattice structures for vibration isolation.

Focus variation measurement of electron beam melted surfaces (2017)
Conference Proceeding
Newton, L., Senin, N., & Leach, R. (2017). Focus variation measurement of electron beam melted surfaces.

Electron beam melting (EBM) is a promising additive manufacturing process which is seeing increasing use in high value manufacturing sectors such as aerospace [1]. With its layer-by-layer approach, EBM can allow the creation of parts of complex shape... Read More about Focus variation measurement of electron beam melted surfaces.

Detecting the signature of motion stage non-linearity for focus variation microscopy using measurement noise and surface topography repeatability (2017)
Conference Proceeding
Alburayt, A., Syam, W. P., & Leach, R. (2017). Detecting the signature of motion stage non-linearity for focus variation microscopy using measurement noise and surface topography repeatability.

Measurement noise is one of the ISO-proposed metrological characteristics of areal surface texture instruments [1, 2, 3, 4]. Measurement noise includes all of the unwanted contributions to the output signals when the instrument is used in its normal... Read More about Detecting the signature of motion stage non-linearity for focus variation microscopy using measurement noise and surface topography repeatability.

Measurement noise of a point autofocus surface topography instrument (2017)
Conference Proceeding
Feng, X., Quagliotti, D., Maculotti, G., Syam, W. P., Tosello, G., Hansen, H. N., …Leach, R. (2017). Measurement noise of a point autofocus surface topography instrument.

Optical instruments for areal topography measurement can be especially sensitive to noise when scanning is required. Such noise has different sources, including those internally generated and external sources from the environment [1].For some instrum... Read More about Measurement noise of a point autofocus surface topography instrument.

An industrial survey on the use of surface texture parameters (2017)
Conference Proceeding
Todhunter, L. D., Leach, R., & Lawes, S. D. (2017). An industrial survey on the use of surface texture parameters.

In 1999, CIRP conducted an industrial survey of the use of surface texture parameters [1]. In the seventeen years since, much has changed, with the most important advancement being the introduction of areal surface texture parameters as described in... Read More about An industrial survey on the use of surface texture parameters.

X-ray computed tomography of additively manufactured metal parts: the effect of magnification and reconstruction sampling on surface topography measurement (2017)
Conference Proceeding
Thompson, A., Körner, L., Senin, N., Lawes, S., Leach, R., & Maskery, I. (2017). X-ray computed tomography of additively manufactured metal parts: the effect of magnification and reconstruction sampling on surface topography measurement.

X-ray computed tomography (XCT) has recently become recognised as a viable method of surface topography measurement for additively manufactured (AM) metal parts [1–5]. AM is capable of producing internal features that are inaccessible to other surfac... Read More about X-ray computed tomography of additively manufactured metal parts: the effect of magnification and reconstruction sampling on surface topography measurement.

Coherence scanning interferometry for additive manufacture (2017)
Conference Proceeding
Gomez, C., Thompson, A., DiSciacca, J., Lawes, S., & Leach, R. (2017). Coherence scanning interferometry for additive manufacture.

Additive manufacture (AM) of metal components is a rapidly maturing technology; but given the large number of interrelated process parameters, it remains difficult to control to high precision. It has been observed that processing conditions may be a... Read More about Coherence scanning interferometry for additive manufacture.

Tolerance on sphere radius for the calibration of the transfer function of coherence scanning interferometry (2017)
Conference Proceeding
Su, R., Coupland, J. M., Wang, Y., & Leach, R. K. (2017). Tolerance on sphere radius for the calibration of the transfer function of coherence scanning interferometry. In P. Lehmann, W. Osten, & A. Albertazzi Gonçalves (Eds.), Proceedings Volume 10329 Optical Measurement Systems for Industrial Inspection X. https://doi.org/10.1117/12.2272041

Although coherence scanning interferometry (CSI) commonly achieves a sub-nanometre noise level in surface topography measurement, the absolute accuracy is difficult to determine when measuring a surface that contains varying local slope angles and cu... Read More about Tolerance on sphere radius for the calibration of the transfer function of coherence scanning interferometry.

Optical difference engine for defect inspection in highly-parallel manufacturing processes (2017)
Conference Proceeding
Feng, X., Su, R., Liu, M., & Leach, R. K. (2017). Optical difference engine for defect inspection in highly-parallel manufacturing processes.

Traditional defect inspection for highly-parallel manufacturing processes requires the processing of large measurement datasets, which is often not fast enough for in-situ inspection of large areas with high resolution. This study develops an all-opt... Read More about Optical difference engine for defect inspection in highly-parallel manufacturing processes.

Investigating mechanical characteristics of styli for micro-CMMs (2016)
Conference Proceeding
Ismail, M., Tseng, K., Claverley, J. D., Sheu, D., Chetwynd, D., & Leach, R. K. (2016). Investigating mechanical characteristics of styli for micro-CMMs.

The mechanical characteristics of styli for micro coordinate measuring machines (micro-CMMs) is of importance because of the major effect the styli have on the performance and capability of micro-CMMs. Previous work has focussed on the design of the... Read More about Investigating mechanical characteristics of styli for micro-CMMs.

Towards uncertainty in dimensional metrology of surface features for advanced manufacturing (2016)
Conference Proceeding
Musso, G., Senin, N., Galetto, M., & Leach, R. K. (2016). Towards uncertainty in dimensional metrology of surface features for advanced manufacturing.

In previous work, an original approach was developed for the dimensional characterisation of surface features on parts and test artefacts, aimed at supporting researchers involved in the study of advanced manufacturing processes. In the approach, met... Read More about Towards uncertainty in dimensional metrology of surface features for advanced manufacturing.

An integrated measurement method for complex micro-scale geometries (2016)
Conference Proceeding
Rabani, A., Senin, N., Helmli, F., Butler-Smith, P., & Leach, R. K. (2016). An integrated measurement method for complex micro-scale geometries.

Micro-scale geometries are becoming commonplace in many high-precision manufacturing applications. Micro-drilling processes, for example, are being employed for producing holes in demanding applications involving fluid transfer, atomisers and micro-m... Read More about An integrated measurement method for complex micro-scale geometries.

Optical metrology for digital manufacturing: A review
Conference Proceeding
Catalucci, S., Thompson, A., Eastwood, J., Piano, S., Branson, D. T., & Leach, R. Optical metrology for digital manufacturing: A review.

The so-called 4th Industrial Revolution is defined by the transformation of individual manufacturing activities into interconnected, highly efficient, flexible, and automated production flows. In this context, manufacturing processes are moving from... Read More about Optical metrology for digital manufacturing: A review.