Optical proximity sensor based on self-mixing interferometry

Dario Melchionni; Alessandro Pesatori; Michele Norgia

doi:10.1117/1.OE.57.5.051507

5 March 2018 Optical proximity sensor based on self-mixing interferometry

Dario Melchionni, Alessandro Pesatori, Michele Norgia

Author Affiliations +

Optical Engineering, Vol. 57, Issue 5, 051507 (March 2018). https://doi.org/10.1117/1.OE.57.5.051507

Abstract

A proximity detector based on self-mixing technique, well suited for different industrial applications, is demonstrated. Instead of using a light-source plus a detector, the proposed sensor is realized by a single laser source. Two different physical effects in the laser diode allow for a continuous detecting range, from 10 mm up to 80 mm. The main advantages of the sensor are target detection from just one point of view; multiple sensors configuration does not need optical filters; separation of source and detector is eliminated; and background rejection is intrinsically given by the self-mixing effect, which shows a sharp cut-off after the focus.

Citation Download Citation

Dario Melchionni, Alessandro Pesatori, and Michele Norgia "Optical proximity sensor based on self-mixing interferometry," Optical Engineering 57(5), 051507 (5 March 2018). https://doi.org/10.1117/1.OE.57.5.051507

Received: 30 November 2017; Accepted: 13 February 2018; Published: 5 March 2018

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