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Proceedings Paper

New absolute distance interferometric technique
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Paper Abstract

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.

Paper Details

Date Published: 10 September 2004
PDF: 9 pages
Proc. SPIE 5457, Optical Metrology in Production Engineering, (10 September 2004); doi: 10.1117/12.546085
Show Author Affiliations
Michele Norgia, Univ. degli Studi di Pavia (Italy)
INFM (Italy)
Guido Giuliani, Univ. degli Studi di Pavia (Italy)
Silvano Donati, Univ. degli Studi di Pavia (Italy)


Published in SPIE Proceedings Vol. 5457:
Optical Metrology in Production Engineering
Wolfgang Osten; Mitsuo Takeda, Editor(s)

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