POSTER SESSION 1
15:30–17:30, Monday, September 14
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
ABSTRACT 1341 | POSTER 137
A NEAR-180° BACKWARD SMALL-ANGLE MUELLER MATRIX POLARIMETER FOR THE MEASUREMENT OF AQUATIC PARTICULATES
Marine ecosystems contain abundant organic plankton and inorganic particles that are crucial for maintaining ecological balance and driving material and energy cycles. Polarization lidar provides high-resolution ocean sensing, where 180° scattering and the Mueller matrix are key to characterizing particle types, size, shape, and refractive index. However, accurate backscattering polarization measurement remains challenging. To provide calibration and validation data for ocean lidar, this paper presents a backward small-angle Mueller matrix measurement system that combines an off-axis parabolic mirror and a bilateral telecentric optical path. It covers scattering angles from 173° to 179.4° with 0.01° resolution. Using four polarization states (0°, 45°, 90°, 135°) for generation and analysis yields 16 scattering combinations and a 3×3 Mueller matrix. Submicron polystyrene standard particles with relatively flat phase functions were used for amplitude calibration. Three micron-sized polystyrene particle types with distinct phase function trends were measured, and the Mueller matrix elements agreed well with Mie theory. Comparison with a Scheimpflug lidar using tap water and various polystyrene particles showed consistent results. Furthermore, Mueller matrices of various marine microalgae were measured; classification of six algae species achieved 84.1% accuracy, thus demonstrating the system’s effectiveness for particulates classification and providing accurate data for ocean lidar calibrations.
Bingyi Liu, Ocean University of China, [email protected], https://orcid.org/0009-0002-3293-1937
Peizhi Zhu, Shanghai Institute of Optics and Fine Mechanics, [email protected]
Hongwei Zhang, Ocean University of China, [email protected]
Yan He, Shanghai Institute of Optics and Fine Mechanics, [email protected]
Songhua Wu, Ocean University of China, [email protected]
Poster Session | 1 | 2 | 3 | 4 | Schedule at a Glance
