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Professor RICHARD LEACH's Outputs (26)

Effects of defocus on the transfer function of coherence scanning interferometry (2017)
Journal Article
Su, R., Thomas, M., Leach, R., & Coupland, J. (2017). Effects of defocus on the transfer function of coherence scanning interferometry. Optics Letters, 43(1), https://doi.org/10.1364/OL.43.000082

Coherence scanning interferometry (CSI) offers three dimensional (3D) measurement of surface topography with high precision and accuracy. Defocus within the interferometric objective lens, however, is commonly present in CSI measurements, and reduces... Read More about Effects of defocus on the transfer function of coherence scanning interferometry.

Feature-based characterisation of signature topography in laser powder bed fusion of metals (2017)
Journal Article
Senin, N., Thompson, A., & Leach, R. K. (2018). Feature-based characterisation of signature topography in laser powder bed fusion of metals. Measurement Science and Technology, 29(4), Article 045009. https://doi.org/10.1088/1361-6501/aa9e19

The use of state-of-the-art areal topography measurement instrumentation allows for a high level of detail in the acquisition of topographic information at micrometric scales. The three-dimensional geometric models of surface topography obtained from... Read More about Feature-based characterisation of signature topography in laser powder bed fusion of metals.

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.

Flexible decoupled camera and projector fringe projection system using inertial sensors (2017)
Journal Article
Stavroulakis, P., Sims-Waterhouse, D., Piano, S., & Leach, R. K. (in press). Flexible decoupled camera and projector fringe projection system using inertial sensors. Optical Engineering, 56(10), https://doi.org/10.1117/1.OE.56.10.104106

Measurement of objects with complex geometry and many self occlusions is increasingly important in many fields, including additive manufacturing. In a fringe projection system, the camera and the projector cannot move independently with respect to ea... Read More about Flexible decoupled camera and projector fringe projection system using inertial sensors.

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.

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.

Feature-based characterisation of laser powder bed fusion surfaces (2017)
Presentation / Conference Contribution
Senin, N., Thompson, A., & Leach, R. K. Feature-based characterisation of laser powder bed fusion surfaces. Presented at Joint Special Interest Group meeting between euspen and ASPE Dimensional Accuracy and Surface Finish in Additive Manufacturing

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.

Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing (2017)
Presentation / Conference Contribution
Xu, Z., Hyde, C. J., Thompson, A., Leach, R. K., Maskery, I., Tuck, C., & Clare, A. T. Defect evolution in laser powder bed fusion additive manufactured components during thermo-mechanical testing. Presented at Joint Special Interest Group meeting between euspen and ASPE Dimensional Accuracy and Surface Finish in Additive Manufacturing

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.

Design and analysis of strut-based lattice structures for vibration isolation (2017)
Journal Article
Syam, W. P., Jianwei, W., Zhao, B., Maskery, I., Elmadih, W., & Leach, R. (2018). Design and analysis of strut-based lattice structures for vibration isolation. Precision Engineering, 51, 494-506. https://doi.org/10.1016/j.precisioneng.2017.09.010

This paper presents the design, analysis and experimental verification of strut-based lattice structures to enhance the mechanical vibration isolation properties of a machine frame, whilst also conserving its structural integrity. In addition, design... Read More about Design and analysis of strut-based lattice structures for vibration isolation.

High-precision lateral distortion measurement and correction in coherence scanning interferometry using an arbitrary surface (2017)
Journal Article
Ekberg, P., Su, R., & Leach, R. K. (2017). High-precision lateral distortion measurement and correction in coherence scanning interferometry using an arbitrary surface. Optics Express, 25(16), https://doi.org/10.1364/OE.25.018703

Lateral optical distortion is present in most optical imaging systems. In coherence scanning interferometry, distortion may cause field-dependent systematic errors in the measurement of surface topography. These errors become critical when high-preci... Read More about High-precision lateral distortion measurement and correction in coherence scanning interferometry using an arbitrary surface.

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.

Results of an industrial survey on the use of surface texture parameters (2017)
Presentation / Conference Contribution
Todhunter, L. D., Leach, R., & Lawes, S. Results of an industrial survey on the use of surface texture parameters. Presented at Met & Props 2017: the 16th International Conference on Metrology and Properties of Engineering Surfaces

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)
Presentation / Conference Contribution
Syam, W. P., Jianwei, W., Zhao, B., Maskery, I., & Leach, R. K. Design of mechanically-optimised lattice structures for vibration isolation. Presented at euspen's 17th International Conference & Exhibition

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.

Tolerance on sphere radius for the calibration of the transfer function of coherence scanning interferometry (2017)
Presentation / Conference Contribution
Su, R., Coupland, J. M., Wang, Y., & Leach, R. K. (2017, June). Tolerance on sphere radius for the calibration of the transfer function of coherence scanning interferometry. Presented at SPIE Optical Metrology, Munich, Germany

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.

An analysis of type F2 software measurement standards for profile surface texture parameters (2017)
Journal Article
Todhunter, L. D., Leach, R. K., Lawes, S., & Blateyron, F. (2017). An analysis of type F2 software measurement standards for profile surface texture parameters. Measurement Science and Technology, 28(6), Article 065017. https://doi.org/10.1088/1361-6501/aa6924

This paper reports on an in-depth analysis of ISO 5436 part 2 type F2 reference software for the calculation of profile surface texture parameters that has been performed on the input, implementation and output results of the reference software devel... Read More about An analysis of type F2 software measurement standards for profile surface texture parameters.

Topography of selectively laser melted surfaces: A comparison of different measurement methods (2017)
Journal Article
Thompson, A., Senin, N., Giusca, C. L., & Leach, R. K. (2017). Topography of selectively laser melted surfaces: A comparison of different measurement methods. CIRP Annals - Manufacturing Technology, 66(1), 543-546. https://doi.org/10.1016/j.cirp.2017.04.075

Selective laser melting (SLM) of metals produces surface topographies that are challenging to measure. Multiple areal surface topography measurement technologies are available, which allow reconstruction of information rich, three-dimensional digital... Read More about Topography of selectively laser melted surfaces: A comparison of different measurement methods.