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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 34, Iss. 4 — Feb. 15, 2009
  • pp: 434–436

Noncontact distance sensor using spatial signal processing

Nabeel A. Riza and Syed Azer Reza  »View Author Affiliations

Optics Letters, Vol. 34, Issue 4, pp. 434-436 (2009)

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To the best of our knowledge, proposed is the first distance-measurement sensor using direct spatial signal processing. The sensor is implemented using a laser beam engaged in target-dependent spatial beam processing using an electronically controlled variable focus lens (ECVFL). Specifically, the target-reflected beam is observed by an optical detector while electronically scanning the focal length of the ECVFL in the path of the laser beam. A received-beam minimum spatial size corresponds to a specific ECVFL focal length that in turn is used to compute the sensed target distance. Experiments have been conducted using a 633 nm He–Ne laser and a liquid ECVFL, giving target distance measurements from 6 to 109 cm with a < 1.7 % sensor resolution. Various noncontact applications for the sensor include sensing of object measurement parameters of distance, motion displacement, three-dimensional structure, spatial profile, and levels.

© 2009 Optical Society of America

OCIS Codes
(120.0280) Instrumentation, measurement, and metrology : Remote sensing and sensors
(130.6010) Integrated optics : Sensors
(280.0280) Remote sensing and sensors : Remote sensing and sensors
(280.4788) Remote sensing and sensors : Optical sensing and sensors
(010.0280) Atmospheric and oceanic optics : Remote sensing and sensors

ToC Category:
Remote Sensing and Sensors

Original Manuscript: October 27, 2008
Revised Manuscript: December 24, 2008
Manuscript Accepted: December 27, 2008
Published: February 9, 2009

Nabeel A. Riza and Syed Azer Reza, "Noncontact distance sensor using spatial signal processing," Opt. Lett. 34, 434-436 (2009)

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