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12 December 1994 Multifunction wavelength-shift interferometry: absolute distance and velocity measurements
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A dynamic interferometer for range finding with directional discrimination is proposed. It uses a laser diode which is tuned in frequency by the injection current with a triangular modulation function. Both the reference and the target signal beams from a Michelson interferometer are combined and coherently detected. The beat frequency is proportional to the optical path difference. When a target is moving, the beat frequency is different according to the upward current ramp or to the downward one, respectively. Consequently, two unknown parameters can be measured: absolute distance and velocity of the target. The technique enables the directional discrimination of the velocity and it doesn't need polarizing components or a spectrum analyzer widely used for such applications. A description of the device, experimental results, and main measuring error sources are presented and discussed.
© (1994) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Christophe Gorecki, A. Chebbour, and Gilbert M. Tribillon "Multifunction wavelength-shift interferometry: absolute distance and velocity measurements", Proc. SPIE 2340, Interferometry '94: New Techniques and Analysis in Optical Measurements, (12 December 1994);

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