A New Moiré Measuring System Based on Multiplied Fringe Shift Technique
نویسندگان
چکیده
منابع مشابه
16 Moiré and Fringe Projection Techniques
The term “moiré” is not the name of a person; in fact, it is a French word referring to “an irregular wavy finish usually produced on a fabric by pressing between engraved rollers” (Webster's 1981). In optics it refers to a beat pattern produced between two gratings of approximately equal spacing. It can be seen in everyday things such as the overlapping of two window screens, the rescreening o...
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6 Error estimation on optical full field techniques (OFFT) is millstone in the diffusion of OFFT. 7 The present work describes a generic way to estimate overall error in fringe projection, either 8 due to random sources (phase error, basically related to the quality of the camera and of the 9 fringe extraction algorithm) or the bias (calibration errors). Here, a high level calibration 10 proced...
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Digital fringe profilometry based on triangular fringe patterns and spatial shift estimation
In this paper, we present a new approach for the 3D measurement using digital fringe projection. Instead of sinusoidal fringe patterns and the traditional phase shift detection, the proposed technique makes use of triangular patterns and the spatial shift estimation for extract the 3D shape. The proposed technique is advantageous not only by improved immunization to nonlinear distortion associa...
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A Moiré fringe approach is developed to identify simultaneously the global and local distortions in hot-embossed polymeric samples. A square grid pattern with a pitch of 63.5 microm is hot-embossed on the polymer substrate. When a reference grid, a polymeric film with the same pattern, is placed on top of the sample, a Moiré fringe pattern is observed and recorded by a document scanner. The dev...
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ژورنال
عنوان ژورنال: Journal of the Japan Society of Precision Engineering
سال: 1975
ISSN: 0374-3543
DOI: 10.2493/jjspe1933.41.448