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12 February 2001 Laser range-finding by phase-shift measurement: moving toward smart systems
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The systems presented in this paper are based on phase-shift measurement. The first solution developed here is the heterodyne technique associated with direct counting. An improvement of the system consists in using digital PLL to reduce the phase noise. A second technique based on under-sampling technique, applied to digital synchronous detection, is described. Its main advantage is a global simplification of the electronic system, leading to a quite simple development of a twofold modulation system. This new technique is also very interesting to move towards a kind of smart range finder able to adapt different parameters to the different steps of the measurement.
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Stephane Poujouly and Bernard A. Journet "Laser range-finding by phase-shift measurement: moving toward smart systems", Proc. SPIE 4189, Machine Vision and Three-Dimensional Imaging Systems for Inspection and Metrology, (12 February 2001);

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