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Time-correlated single-photon counting for single and multiple wavelength underwater depth imaging (Conference Presentation)
Author(s): Aurora Maccarone; Aongus McCarthy; Abderrahim Halimi; Julian Tachella; Puneet S. Chhabra; Yoann Altmann; Andrew M. Wallace; Stephen MaLaughlin; Yvan R. Petillot; Gerald S. Buller
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Paper Abstract

A scanning depth imaging system is used for the investigation of three-dimensional image reconstruction and classification of targets in underwater environments. The system uses the Time-Correlated Single-Photon Counting (TCSPC) technique to measure single-photon time-of-flight. In this paper, we use both single and multiple wavelengths to interrogate underwater targets. This presentation will show laboratory measurements on several target scenarios, including targets in clutter. We demonstrate high resolution depth and intensity image reconstruction in highly scattering underwater scenarios, and show image reconstruction at up to nine attenuation lengths between transceiver and target. The system comprised a scanning transceiver unit, fiber coupled to a silicon single-photon avalanche diode (Si SPAD) and a supercontinuum laser system operating at the repetition rate of 19.5 MHz. An acousto-optic tunable filter (AOTF) is used to select an individual operational wavelength in the range 500 nm to 725 nm. The measurements used a range of system configurations, including both single wavelength and multiple wavelength measurements. Generally, the measurements used sub-milliwatt average optical power levels. Bespoke algorithms were developed to identify man-made objects hidden by marine vegetation in the scanned scene. Advanced statistical image processing methods were used to improve target discrimination and to reconstruct the target under different conditions, including reduced number of wavelengths and number of pixels, and reduced acquisition time. Particular attention will be given to the photon starved regime, which will be typical of data acquired at long distances in open ocean waters or in highly scattering environments.

Paper Details

Date Published: 14 May 2018
Proc. SPIE 10659, Advanced Photon Counting Techniques XII, 106590R (14 May 2018); doi: 10.1117/12.2304937
Show Author Affiliations
Aurora Maccarone, Heriot-Watt Univ. (United Kingdom)
Aongus McCarthy, Heriot-Watt Univ. (United Kingdom)
Abderrahim Halimi, Heriot-Watt Univ. (United Kingdom)
Julian Tachella, Heriot-Watt Univ. (United Kingdom)
Puneet S. Chhabra, Heriot-Watt Univ. (United Kingdom)
Yoann Altmann, Heriot-Watt Univ. (United Kingdom)
Andrew M. Wallace, Heriot-Watt Univ. (United Kingdom)
Stephen MaLaughlin, Heriot-Watt Univ. (United Kingdom)
Yvan R. Petillot, Heriot-Watt Univ. (United Kingdom)
Gerald S. Buller, Heriot-Watt Univ. (United Kingdom)

Published in SPIE Proceedings Vol. 10659:
Advanced Photon Counting Techniques XII
Mark A. Itzler; Joe C. Campbell, Editor(s)

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