Journal ArticleDOI
Two-dimensional fringe-pattern analysis.
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Two-dimensional sinusoid fitting and Fourier transform methods of analyzing fringes to determine the wave-front topography are described and are accurate.Abstract:
Two-dimensional sinusoid fitting and Fourier transform methods of analyzing fringes to determine the wave-front topography are described. The methods are easy to apply because they do not require finding fringe centers and fringe orders. Also, they are accurate. For an active optics experiment in which we have used these techniques, experimental noise exceeds the error resulting from analysis of noise-free theoretical fringe patterns.read more
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Digital double pulse-TV-holography
TL;DR: In this article, a double-pulsed holographic system is described where two separate holograms of an object under test are recorded within a few microseconds using a CCD-camera and stored in a frame grabber.
Journal ArticleDOI
Automated fringe pattern analysis in experimental mechanics: A review
TL;DR: The main numerical techniques that have been developed to carry out fully automated analysis of fringe patterns resulting from solid mechanics experiments are reviewed, and a unified treatment for both speckle and smooth-wavefront interferograms is presented.
Journal ArticleDOI
Fast profilometer for the automatic measurement of 3-D object shapes.
Shouhong Tang,Yau Y. Hung +1 more
TL;DR: A fast technique for automatic 3-D shape measurement that can automatically and accurately obtain the phase map or the height information of a measured object at every pixel point without assigning fringe orders and interpreting data in the regions between the fringe orders is proposed and verified by experiments.
Journal ArticleDOI
Two-dimensional Fourier transform profilometry for the automatic measurement of three-dimensional object shapes
Jin-Feng Lin,Xianyu Su +1 more
TL;DR: Two-dimensional Fourier transform profilometry (2-D FTP) for the automatic measurement of three-dimensional (3-D) object shapes is presented and verified by the experiment in this paper.
Journal ArticleDOI
Moiré interferogram phase extraction: a ridge detection algorithm for continuous wavelet transforms.
TL;DR: The sensitivity of the moiré interferometry method is improved to obtain a pixel-by-pixel in-plane strain distribution map and the proposed ridge detection algorithm is explored with dynamic programming optimization.
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Journal Article
Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry
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.
Journal ArticleDOI
Fourier-transform method of fringe-pattern analysis for computer-based topography and interferometry
TL;DR: In this paper, 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.
Journal ArticleDOI
Direct phase detecting system.
Yoshiki Ichioka,M. Inuiya +1 more
TL;DR: A system for extracting the phase components of an optical traveling wave field has been constructed using the Mach-Zehnder interferometer to capture the wave field as the hologram, a photoelectronic scanning system, and an analog computing circuit.
Journal ArticleDOI
Real-time fringe-pattern analysis.
TL;DR: The task is to learn the phases of real positive intensity fringes from an optical testing interferometer using a direct analog-to-digital arctangent converter, coupled to a turns counter that automatically registers unwrapped phase.