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Effects of off-focal radiation on dimensional measurements in industrial cone-beam micro-focus X-ray computed tomography systems (2020)
Journal Article
Flay, N., Brown, S., Sun, W., Blumensath, T., & Su, R. (2020). Effects of off-focal radiation on dimensional measurements in industrial cone-beam micro-focus X-ray computed tomography systems. Precision Engineering, 66, 472-481. https://doi.org/10.1016/j.precisioneng.2020.08.014

A study of the secondary source phenomenon due to the presence of off-focal radiation in industrial micro-focus cone-beam X-ray computed tomography (XCT) systems and its influence on dimensional measurements is presented. Although off-focal radiation... Read More about Effects of off-focal radiation on dimensional measurements in industrial cone-beam micro-focus X-ray computed tomography systems.

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), 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.

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.

Cascaded machine learning model for reconstruction of surface topography from light scattering (2020)
Journal Article
Liu, M., Senin, N., Su, R., & Leach, R. (2020). Cascaded machine learning model for reconstruction of surface topography from light scattering. Proceedings of SPIE, 11352, https://doi.org/10.1117/12.2555035

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.

Optical topography measurement of steeply-sloped surfaces beyond the specular numerical aperture limit (2020)
Journal Article
Thomas, M., Su, R., de Groot, P., & Leach, R. (2020). Optical topography measurement of steeply-sloped surfaces beyond the specular numerical aperture limit. Proceedings of SPIE, 11352, Article 1135207. https://doi.org/10.1117/12.2554568

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), 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), 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.

Lens aberration compensation in interference microscopy (2020)
Journal Article
Su, R., Thomas, M., Liu, M., Drs, J., Bellouard, Y., Pruss, C., …Leach, R. (2020). Lens aberration compensation in interference microscopy. Optics and Lasers in Engineering, 128, Article 106015. https://doi.org/10.1016/j.optlaseng.2020.106015

Emergence of products that feature functional surfaces with complex geometries, such as freeform optics in consumer electronics and augmented reality and virtual reality, requires high-accuracy non-contact surface measurement. However, large discrepa... Read More about Lens aberration compensation in interference microscopy.

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.

High-accuracy surface measurement through modelling of the surface transfer function in interference microscopy (2019)
Journal Article
Su, R., Thomas, M., Liu, M., Coupland, J., & Leach, R. (2019). High-accuracy surface measurement through modelling of the surface transfer function in interference microscopy. Proceedings of SPIE, 11102, Article 1110205. https://doi.org/10.1117/12.2528911

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.

Does interferometry work? A critical look at the foundations of interferometric surface topography measurement (2019)
Journal Article
de Groot, P. J., Colonna de Lega, X., Su, R., & Leach, R. K. (2019). Does interferometry work? A critical look at the foundations of interferometric surface topography measurement. Proceedings of SPIE, 11102, Article 111020G. https://doi.org/10.1117/12.2526654

© 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.

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.

Multimodal mid-infrared optical coherence tomography and spectroscopy for non-destructive testing and art diagnosis (2019)
Conference Proceeding
Zorin, I., Kilgus, J., Su, R., Lendl, B., Brandstetter, M., & Heise, B. (2019). Multimodal mid-infrared optical coherence tomography and spectroscopy for non-destructive testing and art diagnosis. In P. Targowski, R. Groves, & H. Liang (Eds.), https://doi.org/10.1117/12.2528279

Novel types of supercontinuum sources radiating in the infrared (IR) spectral region provide ultra-broadband spectral coverage and maintain distinctive laser-like properties of emission such as brightness, spatial coherence and high power. Being a pe... Read More about Multimodal mid-infrared optical coherence tomography and spectroscopy for non-destructive testing and art diagnosis.

Characterisation Of The Surface Topography Evolution Of An Ink-jet Printed Transparent Fluoroplastic With CSI (2019)
Presentation / Conference
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.

Supercontinuum sources for multimodal MIR-OCT imaging (2019)
Conference Proceeding
Zorin, I., Kilgus, J., Brandstetter, M., Su, R., & Heise, B. (2019). Supercontinuum sources for multimodal MIR-OCT imaging.

In this paper we present a multimodal OCT imaging system operating in the NIR and MIR spectral region. NIR/MIR Supercontinuum source based multimodal OCT provides new insights in scattering materials. The system combines the modality of OCT and spect... Read More about Supercontinuum sources for multimodal MIR-OCT imaging.

Modelling of coherence scanning interferometry for complex surfaces based on a boundary element method (2019)
Journal Article
Thomas, M., Su, R., Nikolaev, N., Coupland, J., & Leach, R. (2019). Modelling of coherence scanning interferometry for complex surfaces based on a boundary element method. Proceedings of SPIE, 11057, 1-12. https://doi.org/10.1117/12.2526015

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.

Material standards design for minimum zone fitting of freeform optics (2019)
Presentation / Conference
Arezki, Y., Lepretre, F., Psota, P., Su, R., Heikkinen, V., Zhang, X., …Nouira, H. (2019, June). Material standards design for minimum zone fitting of freeform optics. Paper presented at euspen’s 19th International Conference & Exhibition, Bilbao, Spain