POSTER SESSION 4
10:30–12:30, Thursday, September 17
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1380 | POSTER 56
SYSTEM TESTING OF A HIGH DYNAMIC RANGE ELASTIC BACKSCATTERING POLARIZATION‑RAMAN OCEAN LIDAR FOR IN‑WATER PLATFORMS
We present system testing and initial checkout deployments of the Persistent Autonomous LiDAR Sensor (PALS), a compact ocean LiDAR developed for high dynamic range elastic backscattering measurements from in-water platforms, including shipborne and unmanned surface and underwater vehicles. PALS employs overlapping receiver collection paths and records orthogonally polarized elastic backscatter at 532 nm, together with a water Raman channel near 650 nm that provides a stable reference for constraining optical attenuation.
The objective at this stage is to verify that the implemented optical and electro-optical design performs consistently with design requirements and with radiative-transfer and optical ray-tracing simulations developed during the design phase. System data are evaluated in terms of signal structure, overlap behaviour between receiver fields, polarization fidelity, relative channel scaling, and dynamic-range management across the water column.
A central focus of this work is exercising the uncertainty analysis framework using real system data. Quantifying uncertainties in key engineering parameters, including laser energy stability, timing jitter, gain-ramp calibration, optical alignment, overlap correction, polarization cross-talk, and noise terms are essential for establishing robust uncertainty bounds on both the primary optical parameters retrieved and the derived biogeochemical parameters.
Subsequent calibration will be performed in the Phytotank facility at Imirfada Ltd, an ocean LiDAR not-for-profit based in Clashnessie, Scotland. Phytotank is a seawater test range designed specifically for calibrating ocean LiDAR systems, enabling repeatable measurements using purified seawater, controlled inorganic particle suspensions, and monocultures of live Arctic phytoplankton with well-characterized optical properties.
This effort is funded by ARIA’s Forecasting Tipping Points programme.
Fraser Dalgleish, Imirfada Ltd, [email protected], https://orcid.org/0000-0003-1220-4935
Walter Britton, BeamSea Associates, [email protected]
Eric Rehm, Sea-Bird Scientific, [email protected]
Struan Dalgleish, Imirfada Ltd, [email protected]
Brad Neimann, University of Strathclyde, [email protected]
David McKee, University of Strathclyde, [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
