5 March 2018 Optical proximity sensor based on self-mixing interferometry
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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.
© 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)
Dario Melchionni, Dario Melchionni, Alessandro Pesatori, Alessandro Pesatori, Michele Norgia, 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 . Submission: Received: 30 November 2017; Accepted: 13 February 2018
Received: 30 November 2017; Accepted: 13 February 2018; Published: 5 March 2018

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