This paper presents the development of an optical rangefinder based on self-mixing interferometry. The instrument measures the absolute distance from a remote target, without contact and respecting the Class I safety. A variation of the laser diode bias current origins a modulation of the wavelength and then, due to the phase shift along the channel path, the presence of a target generates interferometric fringes. The electrical frequency of the fringes signal is proportional to the target distance. The realized device consists in analog and digital circuits. The analog circuits drive the laser diode, detect the interferometric signal and filter it. A Digital Signal Processor is needed to acquire the fringes signal and, by extracting its frequency, evaluate the absolute distance. The developed rangefinder allows spatial resolution better than 100 µm over a range from 5 cm to 2 m.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.