All Outputs (196)

Material standards design for minimum zone fitting of freeform optics (2019)
Presentation / Conference

Optical measurement of surface topographies with transparent coatings (2019)
Journal Article

Manufacturers nowadays have access to state-of-the-art areal surface topography measurement instruments that allow investigation of surface topography at unprecedented levels of detail and over a wide range of scales. However, high value-added produc... Read More about Optical measurement of surface topographies with transparent coatings.

Methodology for the development of in-line optical surface measuring instruments with a case study for additive surface finishing (2019)
Journal Article

The productivity rate of a manufacturing process is limited by the speed of any measurement processes at the quality control stage. Fast and effective in-line measurements are required to overcome this limitation. Optical instruments are the most pro... Read More about Methodology for the development of in-line optical surface measuring instruments with a case study for additive surface finishing.

Lateral error compensation for stitching-free measurement with focus variation microscopy (2019)
Journal Article

This paper proposes a practical methodology to quantify and compensate lateral errors for focus variation microscopy measurements without stitching. The main advantages of this new methodology are its fast and simple implementation using any uncalibr... Read More about Lateral error compensation for stitching-free measurement with focus variation microscopy.

Towards superresolution surface metrology: quantum estimation of angular and axial separations (2019)
Journal Article

We investigate the localization of two incoherent point sources with arbitrary angular and axial separations in the paraxial approximation. By using quantum metrology techniques, we show that a simultaneous estimation of the two separations is achiev... Read More about Towards superresolution surface metrology: quantum estimation of angular and axial separations.

Residual flatness and scale calibration for a point autofocus surface topography measuring instrument (2019)
Journal Article

Point autofocus instruments are often used for measuring the surface topography of objects with complex geometry. Determining the metrological characteristics of the instrument is key to ensuring a traceable areal surface topography measurement. In t... Read More about Residual flatness and scale calibration for a point autofocus surface topography measuring instrument.

Assessment of surface topography modifications through feature-based registration of areal topography data (2019)
Journal Article

Surface topography modifications due to wear or other factors are usually investigated by visual and microscopic inspection, and – when quantitative assessment is required – through the computation of surface texture parameters. However, the current... Read More about Assessment of surface topography modifications through feature-based registration of areal topography data.

All-optical difference engine for in-process defect inspection for roll-to-roll printed electronics (2019)
Journal Article

© 2019 SPIE. The increasing capabilities of roll-to-roll (R2R) printing processes present challenges for quality control, requiring inprocess inspection of large substrates with high resolution at high speed. In this paper, an all-optical difference... Read More about All-optical difference engine for in-process defect inspection for roll-to-roll printed electronics.

Mathematical approach to the validation of functional surface texture parameter software (2019)
Journal Article

A new method for performance validation of surface texture parameter calculation software is introduced, focussing on functional surface texture parameters. Material ratio curves are defined algebraically and used to calculate functional surface text... Read More about Mathematical approach to the validation of functional surface texture parameter software.

Resolution enhancement for topography measurement of high-dynamic-range surfaces via image fusion (2018)
Journal Article

In this paper, we introduce a method and algorithm for resolution enhancement of low-resolution surface topography data by fusing it with corresponding high-resolution intensity images. This fusion is carried out by linking the three-dimensional topo... Read More about Resolution enhancement for topography measurement of high-dynamic-range surfaces via image fusion.

Imaging beyond the fundamental slope limit in surface metrology using fluorophore-aided scattering microscopy (2018)
Presentation / Conference

Topography measurement for smooth surfaces with high slopes, e.g. freeform optics, is a challenging task for optical measuring instruments as the light reflected by the tilted surface cannot be sufficiently collected by the objective, resulting in lo... Read More about Imaging beyond the fundamental slope limit in surface metrology using fluorophore-aided scattering microscopy.

Areal topography measurement of metal additive surfaces using focus variation microscopy (2018)
Journal Article

In this work, the performance of a focus variation instrument for measurement of areal topography of metal additive surfaces was investigated. Samples were produced using both laser and electron beam powder bed fusion processes with some of the most... Read More about Areal topography measurement of metal additive surfaces using focus variation microscopy.

Mechanical vibration bandgaps in surface-based lattices (2018)
Journal Article

In this paper, the phonon dispersion curves of several surface-based lattices are examined, and their energy transmission spectra, along with the corresponding bandgaps are identified. We demonstrate that these bandgaps may be controlled, or tuned, t... Read More about Mechanical vibration bandgaps in surface-based lattices.

Calibration and adjustment of a high-precision five degree of freedom hybrid mechanism (2018)
Conference Proceeding

Designing low frequency band gaps in additively manufactured parts using internal resonators (2018)
Conference Proceeding

Infidelity and the calibration of optical surface topography measuring instruments (2018)
Conference Proceeding

Determination of the lateral resolution of an interference microsope using a micro-scale sphere (2018)
Conference Proceeding

Representing the specification of industrial X-ray computed tomography with amplitude-wavelength space (2018)
Conference Proceeding

Rapid tracking of extrinsic projector parameters in fringe projection using machine learning (2018)
Journal Article

In this work, we propose to enable the angular re-orientation of a projector within a fringe projection system in real-time without the need for re-calibrating the system. The estimation of the extrinsic orientation parameters of the projector is per... Read More about Rapid tracking of extrinsic projector parameters in fringe projection using machine learning.

Verification of a rigorous 2D model of rough surface scattering (2018)
Conference Proceeding

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.