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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 10 — Apr. 1, 1999
  • pp: 1990–1997

Measurement of shape by using projected random patterns and temporal digital speckle photography

Mikael Sjödahl and Per Synnergren  »View Author Affiliations


Applied Optics, Vol. 38, Issue 10, pp. 1990-1997 (1999)
http://dx.doi.org/10.1364/AO.38.001990


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Abstract

Projected random patterns have been used to measure the shape of discontinuous objects. A sequence of independent random patterns are projected onto the object. These images are analyzed by use of the technique called temporal digital speckle photography (DSP) that is introduced here. With temporal DSP the spatial resolution of the shape measurement is improved considerably compared with previously reported results with projected random patterns. A calibration procedure is described that uses a sequence of independent random patterns to calibrate measurement volume. As a result, independent space coordinates for each subimage are obtained. The accuracy is of the order of 1/1000 of the field of view where a subimage size of 8 pixels seems to be a good compromise between reliability and spatial resolution. The technique is illustrated with a measurement of an electrical plug and a 9-V battery.

© 1999 Optical Society of America

OCIS Codes
(120.3940) Instrumentation, measurement, and metrology : Metrology
(120.6150) Instrumentation, measurement, and metrology : Speckle imaging
(120.6650) Instrumentation, measurement, and metrology : Surface measurements, figure

History
Original Manuscript: October 12, 1998
Revised Manuscript: December 21, 1998
Published: April 1, 1999

Citation
Mikael Sjödahl and Per Synnergren, "Measurement of shape by using projected random patterns and temporal digital speckle photography," Appl. Opt. 38, 1990-1997 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-10-1990


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References

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