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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 49, Iss. 23 — Aug. 10, 2010
  • pp: 4392–4403

Improved measurement linearity and precision for AMCW time-of-flight range imaging cameras

Andrew D. Payne, Adrian A. Dorrington, Michael J. Cree, and Dale A. Carnegie  »View Author Affiliations


Applied Optics, Vol. 49, Issue 23, pp. 4392-4403 (2010)
http://dx.doi.org/10.1364/AO.49.004392


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Abstract

Time-of-flight range imaging systems utilizing the amplitude modulated continuous wave (AMCW) technique often suffer from measurement nonlinearity due to the presence of aliased harmonics within the amplitude modulation signals. Typically a calibration is performed to correct these errors. We demonstrate an alternative phase encoding approach that attenuates the harmonics during the sampling process, thereby improving measurement linearity in the raw measurements. This mitigates the need to measure the system’s response or calibrate for environmental changes. In conjunction with improved linearity, we demonstrate that measurement precision can also be increased by reducing the duty cycle of the amplitude modulated illumination source (while maintaining overall illumination power).

© 2010 Optical Society of America

OCIS Codes
(110.6880) Imaging systems : Three-dimensional image acquisition
(120.2920) Instrumentation, measurement, and metrology : Homodyning
(120.5050) Instrumentation, measurement, and metrology : Phase measurement
(150.5670) Machine vision : Range finding
(150.6910) Machine vision : Three-dimensional sensing
(280.3640) Remote sensing and sensors : Lidar

ToC Category:
Imaging Systems

History
Original Manuscript: March 11, 2010
Revised Manuscript: July 7, 2010
Manuscript Accepted: July 8, 2010
Published: August 5, 2010

Citation
Andrew D. Payne, Adrian A. Dorrington, Michael J. Cree, and Dale A. Carnegie, "Improved measurement linearity and precision for AMCW time-of-flight range imaging cameras," Appl. Opt. 49, 4392-4403 (2010)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-49-23-4392

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