17 October 1994 Digital three-dimensional imaging in the infrared at the National Research Council of Canada
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Abstract
This paper presents work performed at the National Research Council of Canada in infrared range imaging, i.e., from 1.5 micrometers to 1.8 micrometers . This region of the spectrum is chosen for eye-safety reasons. Basic concepts explaining the triangulation principle used in NRC prototypes are presented. The requirements for laser source and optics are described in some detail. Laser spot position detection is reviewed in the context of infrared range imaging with actual design examples and detailed calculations of signal-to-noise ratios. These calculations are useful in the early stage of a design. Experimental results show range images taken with the first prototype built at the Institute for Information Technology. A discussion on current developments concentrates on another prototype range camera intended for space applications. The current version of that prototype operates at 0.82 micrometers and can perform tasks in tracking mode at a refresh rate of 130 Hz (60 targets per second) or in imaging mode at a data rate of 18,000 registered 3-D and intensity points per second. The useful range is about 0.5 m to 10 m. For distances greater than 10 m, a time-of-flight unit along with a pulsed-laser source operating at 1.54 micrometers are included. The change of operating wavelength provides a system that is eye-safe and increases the signal to background light rejection for space applications.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. Angelo Beraldin, J. Angelo Beraldin, Marc Rioux, Marc Rioux, Francois Blais, Francois Blais, R. A. Couvillon, R. A. Couvillon, } "Digital three-dimensional imaging in the infrared at the National Research Council of Canada", Proc. SPIE 2269, Infrared Technology XX, (17 October 1994); doi: 10.1117/12.188638; https://doi.org/10.1117/12.188638
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