High resolution self-mixing laser rangefinder

The Review of Scientific Instruments
Michele NorgiaAlessandro Pesatori

Abstract

This work describes the development of a novel laser instrument for non-contact absolute distance measurements, working in safety class I. The physical principle of operation is based on the self-mixing effect in a laser diode: the laser diode wavelength is modulated through a change of the supply current, inducing a self-mixing signal. The frequency of the produced fringes depends on the target distance, therefore a particular algorithm is applied, in real-time, to extract the frequency tone of the fringes, even in the case of very low signal-to-noise ratio. The final low-cost instrument is realized with an embedded digital signal processor and works in real-time over diffusive targets, with resolution better than 100 μm for distances up to 2 m.

Citations

Aug 3, 2014·The Review of Scientific Instruments·D Melchionni, M Norgia
Jan 13, 2017·Optics Letters·Kun LiMichele Norgia
Aug 4, 2012·Applied Optics·Alessandro MagnaniMichele Norgia
May 2, 2018·Optics Letters·Junfeng Wu, Fengfeng Shu
Nov 13, 2015·Applied Optics·Dario MelchionniMichele Norgia
May 15, 2013·Applied Optics·Milan NikolićAleksandar D Rakić

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