Three-Dimensional Sensing Based on a Dynamically Focused Laser Optical Feedback Imaging Technique
Applied Optics, Vol. 40, Issue 12, pp. 1921-1924 (2001)
http://dx.doi.org/10.1364/AO.40.001921
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Abstract
A new method analogous to three-dimensional confocally based sensing is proposed. This method uses the technique of laser optical feedback imaging, which takes advantage of the resonant sensitivity of a short-cavity laser to frequency-shifted optical feedback for highly sensitive detection, making it ideal for surface and volume measurements of noncooperative targets. Rapid depth scanning is made possible by use of an electrically controlled variable-focus lens. The system is able to detect height discontinuities, and because detection occurs along the axis of projection the system does not have problems of shadow. Preliminary results for a depth range of 15 mm and a resolution of 100 μm are presented.
© 2001 Optical Society of America
OCIS Codes
(110.2970) Imaging systems : Image detection systems
(110.6880) Imaging systems : Three-dimensional image acquisition
(150.6910) Machine vision : Three-dimensional sensing
(170.6900) Medical optics and biotechnology : Three-dimensional microscopy
(290.1350) Scattering : Backscattering
(290.5880) Scattering : Scattering, rough surfaces
Citation
Richard Day, Eric Lacot, Frédéric Stoeckel, and Bruno Berge, "Three-Dimensional Sensing Based on a Dynamically Focused Laser Optical Feedback Imaging Technique," Appl. Opt. 40, 1921-1924 (2001)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-40-12-1921
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