Professor RICHARD LEACH's Outputs (118)

Effects of magnification and sampling resolution in X-ray computed tomography for the measurement of additively manufactured metal surfaces (2018)
Journal Article
Thompson, A., Senin, N., Maskery, I., & Leach, R. (2018). Effects of magnification and sampling resolution in X-ray computed tomography for the measurement of additively manufactured metal surfaces. Precision Engineering, 53, https://doi.org/10.1016/j.precisioneng.2018.02.014

Recent studies have shown that X-ray computed tomography (XCT) can be used to measure the surface topography of additively manufactured parts. However, further research is necessary to fully understand XCT measurement performance. Here, we show how m... Read More about Effects of magnification and sampling resolution in X-ray computed tomography for the measurement of additively manufactured metal surfaces.

Lateral scale calibration for focus variation microscopy (2018)
Journal Article
Alburayt, A., Syam, W. P., & Leach, R. (in press). Lateral scale calibration for focus variation microscopy. Measurement Science and Technology, 29(6), https://doi.org/10.1088/1361-6501/aab949

Areal surface texture measuring instruments can be calibrated by determining a set of metrological characteristics currently in the final stages of standardisation. In this paper, amplification, linearity and perpendicularity characteristics have bee... Read More about Lateral scale calibration for focus variation microscopy.

Noise evaluation of a point autofocus surface topography measuring instrument (2018)
Journal Article
Maculotti, G., Feng, X., Galetto, M., & Leach, R. K. (2018). Noise evaluation of a point autofocus surface topography measuring instrument. Measurement Science and Technology, 29(6), https://doi.org/10.1088/1361-6501/aab528

In this work, the measurement noise of a point autofocus surface topography measuring instrument is evaluated, as the first step towards establishing a route to traceability for this type of instrument. The evaluation is based on the determination of... Read More about Noise evaluation of a point autofocus surface topography measuring instrument.

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.

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.

3-dimensional inkjet printing of macro structures from silver nanoparticles (2017)
Journal Article
Vaithilingam, J., Saleh, E., Körner, L., Wildman, R. D., Hague, R. J., Leach, R. K., & Tuck, C. J. (2018). 3-dimensional inkjet printing of macro structures from silver nanoparticles. Materials and Design, 139, https://doi.org/10.1016/j.matdes.2017.10.070

The adoption of additive manufacturing technology is gaining interest for processing precious metals. In this study, the capability of inkjet printing was explored to fabricate macroscopic parts from commercial silver nanoparticle ink (AgNPs). A besp... Read More about 3-dimensional inkjet printing of macro structures from silver nanoparticles.

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.

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.

Characterisation of the topography of metal additive surface features with different measurement technologies (2017)
Journal Article
Senin, N., Thompson, A., & Leach, R. K. (2017). Characterisation of the topography of metal additive surface features with different measurement technologies. Measurement Science and Technology, 28(9), Article 095003. https://doi.org/10.1088/1361-6501/aa7ce2

© 2017 IOP Publishing Ltd. The challenges of measuring the surface topography of metallic surfaces produced by additive manufacturing are investigated. The differences between measurements made using various optical and non-optical technologies, incl... Read More about Characterisation of the topography of metal additive surface features with different measurement technologies.

Staged thermomechanical testing of nickel superalloys produced by selective laser melting (2017)
Journal Article
Xu, Z., Hyde, C. J., Thompson, A., Leach, R. K., Maskery, I., Tuck, C., & Clare, A. T. (2017). Staged thermomechanical testing of nickel superalloys produced by selective laser melting. Materials and Design, 133, 520-527. https://doi.org/10.1016/j.matdes.2017.08.009

The creep performance of additively manufactured components remains an issue before additive manufacturing can be put fully implemented. In this study, Inconel 718 two-bar specimens are produced by selective laser melting and subjected to a ‘staged’... Read More about Staged thermomechanical testing of nickel superalloys produced by selective laser melting.

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.

Industrial survey of ISO surface texture parameters (2017)
Journal Article
Todhunter, L. D., Leach, R., Lawes, S., & Blateyron, F. (2017). Industrial survey of ISO surface texture parameters. CIRP Journal of Manufacturing Science and Technology, 19, https://doi.org/10.1016/j.cirpj.2017.06.001

Results of an international survey are presented, detailing the use of surface texture parameters in industry. The survey received 179 responses from a total of 34 countries, revealing the use of a variety of parameters from ISO 4287, ISO 12085, ISO... Read More about Industrial survey of ISO surface texture parameters.

X-ray computed tomography and additive manufacturing in medicine: a review (2017)
Journal Article
Thompson, A., McNally, D., Maskery, I., & Leach, R. K. (in press). X-ray computed tomography and additive manufacturing in medicine: a review. International Journal of Metrology and Quality Engineering, 8, Article 17. https://doi.org/10.1051/ijmqe/2017015

The use of X-ray computed tomography (XCT) with additive manufacture (AM) within a medical context is examined in this review. The seven AM process families and various XCT scanning techniques are explained in brief, and the use of these technologies... Read More about X-ray computed tomography and additive manufacturing in medicine: a review.

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.

Verification of micro-scale photogrammetry for smooth three-dimensional object measurement (2017)
Journal Article
Sims-Waterhouse, D., Piano, S., & Leach, R. (2017). Verification of micro-scale photogrammetry for smooth three-dimensional object measurement. Measurement Science and Technology, 28(5), Article 055010. https://doi.org/10.1088/1361-6501/aa6364

© 2017 IOP Publishing Ltd. By using sub-millimetre laser speckle pattern projection we show that photogrammetry systems are able to measure smooth three-dimensional objects with surface height deviations less than 1 μm. The projection of laser speckl... Read More about Verification of micro-scale photogrammetry for smooth three-dimensional object measurement.

On tilt and curvature dependent errors and the calibration of coherence scanning interferometry (2017)
Journal Article
Su, R., Wang, Y., Coupland, J., & Leach, R. K. (in press). On tilt and curvature dependent errors and the calibration of coherence scanning interferometry. Optics Express, 25(4), https://doi.org/10.1364/OE.25.003297

Although coherence scanning interferometry (CSI) is capable of measuring surface topography with sub-nanometre precision, it is well known that the performance of measuring instruments depends strongly on the local tilt and curvature of the sample su... Read More about On tilt and curvature dependent errors and the calibration of coherence scanning interferometry.

Combined inkjet printing and infrared sintering of silver nanoparticles using a swathe-by-swathe and layer-by-layer approach for 3-dimensional structures (2017)
Journal Article
Vaithilingam, J., Simonelli, M., Saleh, E., Senin, N., Wildman, R. D., Hague, R. J. M., Leach, R. K., & Tuck, C. J. (2017). Combined inkjet printing and infrared sintering of silver nanoparticles using a swathe-by-swathe and layer-by-layer approach for 3-dimensional structures. ACS Applied Materials and Interfaces, 9(7), 6560-6570. https://doi.org/10.1021/acsami.6b14787

Despite the advancement of additive manufacturing (AM)/3-dimensional (3D) printing, single-step fabrication of multifunctional parts using AM is limited. With the view of enabling multifunctional AM (MFAM), in this study, sintering of metal nanoparti... Read More about Combined inkjet printing and infrared sintering of silver nanoparticles using a swathe-by-swathe and layer-by-layer approach for 3-dimensional structures.