Our current research adds another layer of enhancement over Pulsed Laser Line Scanning (PLLS) by partially rejecting the source-to-target forward scattering effects. The technique uses the same source as PLLS system, but the receiver consists of a linear array of n time-resolved bucket collectors in the cross-axis direction. The spacing between receive elements is large enough to cause measurable time-of-flight differences in the near-field. By using a near-field beamforming algorithm, which sums together the time-resolved receiver waveforms with the appropriate delays based on the geometry, the contrast ratio is improved and some of the multiple forward scattering induced blur/glow/ghosting effects are rejected as well as improving the time-of-flight based 3D image reconstruction. This paper utilizes modeling to investigate the feasibility of this method.
Walter B. Britton, Fraser R. Dalgleish, and Hanqi Zhuang, "Beamforming receiver for underwater pulsed laser line scanning," Proc. SPIE 10631, Ocean Sensing and Monitoring X, 106310L (Presented at SPIE Defense + Security: April 18, 2018; Published: 25 May 2018); https://doi.org/10.1117/12.2310055.
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