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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: James C. Wyant
  • Vol. 46, Iss. 30 — Oct. 20, 2007
  • pp: 7469–7474

Cylinder gauge measurement using a position sensitive detector

W. Doyle St. John  »View Author Affiliations


Applied Optics, Vol. 46, Issue 30, pp. 7469-7474 (2007)
http://dx.doi.org/10.1364/AO.46.007469


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Abstract

A position sensitive detector (PSD) has been used to determine the diameter of cylindrical pins based on the shift in a laser beam's centroid. The centroid of the light beam is defined here as the weighted average of position by the local intensity. A shift can be observed in the centroid of an otherwise axially symmetric light beam, which is partially obstructed. Additionally, the maximum shift in the centroid is a unique function of the obstructing cylinder diameter. Thus to determine the cylinder diameter, one only needs to detect this maximum shift as the cylinder is swept across the beam.

© 2007 Optical Society of America

OCIS Codes
(040.5160) Detectors : Photodetectors
(120.0120) Instrumentation, measurement, and metrology : Instrumentation, measurement, and metrology

ToC Category:
Detectors

History
Original Manuscript: July 9, 2007
Revised Manuscript: August 30, 2007
Manuscript Accepted: August 30, 2007
Published: October 11, 2007

Citation
W. Doyle St. John, "Cylinder gauge measurement using a position sensitive detector," Appl. Opt. 46, 7469-7474 (2007)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-46-30-7469


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References

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