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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 4 — Feb. 1, 2010
  • pp: 648–652

Area measurement at long-distance using a circular Dammann grating

Fung Jacky Wen, Zhongyu Chen, and Po Sheun Chung  »View Author Affiliations

Applied Optics, Vol. 49, Issue 4, pp. 648-652 (2010)

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We describe a novel method of noncontact mode area measurement at long distance of 11.25 m by borrowing the concept of a circular Dammann grating (CDG). The area of objects can be determined accurately by measuring the circular spectrum diameter of the CDG. This noncontact mode measurement requires neither a large amount of image data nor any pattern recognition approach. The spectrum diameter is derived from simple lens formulas. From the fractional Fourier transform, we find that there exists a linear relationship between the spectrum diameter and the distance traveled by the CDG. Compared with the conventional methods, this technique has the advantages of a simple design with good accuracy of better than 3%, low cost, noncontact mode, and a more compact design. Finally, we present several experimental results demonstrating the effectiveness of this system.

© 2010 Optical Society of America

OCIS Codes
(040.0040) Detectors : Detectors
(050.1950) Diffraction and gratings : Diffraction gratings
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(140.3560) Lasers and laser optics : Lasers, ring
(220.4000) Optical design and fabrication : Microstructure fabrication

ToC Category:
Diffraction and Gratings

Original Manuscript: August 10, 2009
Revised Manuscript: December 23, 2009
Manuscript Accepted: January 1, 2010
Published: January 26, 2010

Fung Jacky Wen, Zhongyu Chen, and Po Sheun Chung, "Area measurement at long-distance using a circular Dammann grating," Appl. Opt. 49, 648-652 (2010)

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