10 September 2004 New absolute distance interferometric technique
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We present a new method for the measurement of the absolute distance of a remote target based on the laser diode self-mixing interferometry technique, assisted by an electronic feedback loop capable of increasing the measurement accuracy. In this method, we use an electronic feedback loop to generate a wavelength change that exactly corresponds to one single interferometric fringe. This allows to measure the target distance with a higher accuracy, in principle limited only by detection shot-noise, and not by the fringe quantization error typical of conventional fringe counting approaches. The target distance can be measured with 0.3 mm accuracy, in the 0.2-3 m range.
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Michele Norgia, Michele Norgia, Guido Giuliani, Guido Giuliani, Silvano Donati, Silvano Donati, "New absolute distance interferometric technique", Proc. SPIE 5457, Optical Metrology in Production Engineering, (10 September 2004); doi: 10.1117/12.546085; https://doi.org/10.1117/12.546085


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