Long-range depth profiling of camouflaged targets using single-photon detection

Rachael Tobin, Abderrahim Halimi, Aongus McCarthy, Ximing Ren, Kenneth J. McEwan, Stephen McLaughlin, Gerald Stuart Buller

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Abstract

We investigate the reconstruction of depth and intensity profiles from data acquired using a custom designed time-of-flight scanning transceiver based on the time-correlated single-photon counting technique. The system had an operational wavelength of 1550 nm and used a Peltier-cooled InGaAs/InP single-photon avalanche diode detector. Measurements were made of human figures, in plain view and obscured by camouflage
netting, from a stand-off distance of 230min daylight using only submilliwatt average optical powers. These measurements were analyzed using a pixelwise cross correlation approach and compared to analysis using a bespoke algorithm designed for the restoration of multilayered three-dimensional light detection and ranging images. This algorithm is based on the optimization of a convex cost function composed of a data fidelity term and regularization terms, and the results obtained show that it achieves significant improvements in image quality for multidepth scenarios and for reduced acquisition times.
Original languageEnglish
Article number031303
JournalOptical Engineering
Volume57
Issue number3
Early online date27 Dec 2017
DOIs
Publication statusPublished - Mar 2018

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