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Proceedings Paper

Case studies of optical ringing for airborne lasers seeing into sea water
Author(s): Gary D. Gilbert; Mark H. North
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Paper Abstract

Airborne lidars systems have progressed to the point where they are increasingly being used in surveys and bathymetric studies of coastal and littoral zones. Scattered laser pulse light in these turbid regions hurt the performance of lidar system s as photons delayed by multiple scattering simultaneously return with the signal from a distant target. This phenomenon is called 'optical ringing' and is analogous to reverberation in acoustics. A Monte Carlo model was used to examine the effect of water turbidity on the temporal storage of photons in increasing scattering orders for an airborne lidar. The lidars modeled had combinations of both wide and narrow source and receiver fields. The lidar looked at nadir into a flat clam sea with optical properties ranging from clear to turbid water. The amount of optical ringing present in a return was proportional to the size of the pulse-illuminated in water volume. The results showed multiple scattered light surpassing single scattered light returns for all cases of source-receiver field combinations for even the clearest water studied.

Paper Details

Date Published: 13 November 1996
PDF: 9 pages
Proc. SPIE 2964, CIS Selected Papers: Laser Remote Sensing of Natural Waters: From Theory to Practice, (13 November 1996); doi: 10.1117/12.258349
Show Author Affiliations
Gary D. Gilbert, Naval Command, Control and Ocean Surveillance Ctr. (United States)
Mark H. North, Naval Command, Control and Ocean Surveillance Ctr. (United States)


Published in SPIE Proceedings Vol. 2964:
CIS Selected Papers: Laser Remote Sensing of Natural Waters: From Theory to Practice

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