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Applied Optics

Applied Optics


  • Vol. 43, Iss. 14 — May. 10, 2004
  • pp: 2833–2839

Digital moiré fringe-scanning method for centering a circular fringe image

Zhao Bin  »View Author Affiliations

Applied Optics, Vol. 43, Issue 14, pp. 2833-2839 (2004)

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A digital moiré fringe-scanning method for centering a circular fringe image is proposed. The image of a nondiffracting beam, whose cross section is a circular fringe, is first downloaded onto a computer. The image is then superposed with a digital circular grating, whose center is close to the center of the image, to generate circular moiré fringes. Changing the phase of a digital grating can cause moiré fringe scanning. The global center of the image can be calculated by use of sets of the scanned picture. Because all the image data are used for the calculation, the effect of random noise on centering is greatly reduced and the center position resolution can reach the order of a subelement of a CCD. The measurement of spatial straightness is discussed.

© 2004 Optical Society of America

OCIS Codes
(100.0100) Image processing : Image processing
(100.2650) Image processing : Fringe analysis
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology
(120.3930) Instrumentation, measurement, and metrology : Metrological instrumentation
(120.4120) Instrumentation, measurement, and metrology : Moire' techniques
(120.5050) Instrumentation, measurement, and metrology : Phase measurement

Original Manuscript: July 30, 2003
Revised Manuscript: February 9, 2004
Published: May 10, 2004

Zhao Bin, "Digital moiré fringe-scanning method for centering a circular fringe image," Appl. Opt. 43, 2833-2839 (2004)

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