Author
T.R. Judge
Bio: T.R. Judge is an academic researcher from University of Warwick. The author has contributed to research in topics: Holography & Particle image velocimetry. The author has an hindex of 9, co-authored 11 publications receiving 505 citations.
Papers
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TL;DR: An overview of the phase unwrapping problem is given and fringe tracking, fringe scanning, noise-immune and region processing techniques that have been developed in the search for the fully automated solution are described.
281 citations
TL;DR: In this paper, a carrier fringe technique for photoelasticity stress analysis is described and verified experimentally, where linear carrier fringes generated by using a quartz wedge are superimposed on fringes formed by the stressed model and the resultant fringe pattern is captured using a charge coupled device camera and stored in a digital frame buffer.
60 citations
TL;DR: A new quasi-heterodyne holographic technique is described in which the image is reconstructed using a single beam, and an error compensation scheme is proposed to reduce the effects of random noise.
48 citations
TL;DR: In this paper, a series of experiments have been performed to demonstrate the application of Particle Image Velocimetry (PIV) to turbomachinery flows at transonic speeds on a fully annular engine size turbine nozzle guide vane.
Abstract: A series of experiments have been performed to demonstrate the application of Particle Image Velocimetry (PIV) to turbomachinery flows. The tests were performedat transonic speeds on a fully annular engine size turbine nozzle guide vane. The vane cascade was installed in a short-duration Isentropic Light Piston Cascade (ILPC) test facility operating with high inlet turbulence levels. The technique has been shown to map the whole flow field with a resolution of 0.5 mm
40 citations
TL;DR: In this article, the authors used particle image velocimetry to image seeding particles at up to 2.5 m from the flow in a large-scale transonic wind tunnel.
Abstract: Velocity measurements have been made in a large-scale transonic wind tunnel using particle image velocimetry. Diffraction-limited optics have been used to image seeding particles at up to 2.5 m from the flow. A practical system to record the data has been constructed such that the camera can be remotely focused on the plane of interest. Particle images were recorded onto 35 mm film. Results were obtained from Mach numbers 0.2 to 0.8, and automatically analysed to produce vector maps of the planar velocity field. It has also been shown that particle image velocity data can be successfully recorded onto a charged coupled device image sensor at transonic speeds. This approach eliminates the need for photographic processing and allows real time data acquisition in a digital form. The potential is then apparent for automatic, and near real-time processing, of particle image velocimetry data.
26 citations
Cited by
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Journal Article•
TL;DR: In this article, a fast Fourier transform method of topography and interferometry is proposed to discriminate between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour generation techniques.
Abstract: A fast-Fourier-transform method of topography and interferometry is proposed. By computer processing of a noncontour type of fringe pattern, automatic discrimination is achieved between elevation and depression of the object or wave-front form, which has not been possible by the fringe-contour-generation techniques. The method has advantages over moire topography and conventional fringe-contour interferometry in both accuracy and sensitivity. Unlike fringe-scanning techniques, the method is easy to apply because it uses no moving components.
3,742 citations
TL;DR: In this paper, a method for measuring and mapping displacement fields and strain fields from high-resolution electron microscope (HREM) images is developed based upon centring a small aperture around a strong reflection in the Fourier transform of an HREM lattice image and performing an inverse Fourier transformation.
1,828 citations
TL;DR: This paper presents a meta-analyses of Fourier-Transform Profilometry and its applications in 3-D Shape Measurement and Surface Profile Measurement for Structured Light Pattern and 4-Core Optical-Fiber.
1,110 citations
TL;DR: An up-to-date review and a new classification of the existingShape reconstruction using coded structured light techniques and their potentials are presented.
782 citations
TL;DR: An overview of state-of-the-art phase shifting algorithms for implementing 3D surface profilometry is presented to provide a useful guide to the selection of the most appropriate phase shifting technique for a particular application.
611 citations