研究目的
To compare the performance of several inversion methods for retrieving the complex refractive index of aquatic suspended particles, focusing on particles with complex shapes such as phytoplankton.
研究成果
The genetic algorithm model provides the most accurate estimates of refractive indices but is computationally intensive. The T-matrix method is useful for accurately retrieving refractive indices of particles with complex shapes, such as phytoplankton. The study highlights the importance of selecting appropriate particle shapes for modeling optical properties.
研究不足
The study uses synthetic examples which are simpler than real-life scenarios. The T-matrix method, while applicable to many phytoplankton shapes, requires particles to be rotationally symmetrical. Computational time is a limitation, especially for non-spherical particles.
1：Experimental Design and Method Selection:
The study compares the performance of several inversion methods (Lorenz–Mie theory, T-matrix method, genetic algorithm) for retrieving refractive indices of particles with different shapes (homogeneous spheres, coated spheres, homogeneous cylinders).
2：Sample Selection and Data Sources:
Synthetic examples were constructed for each shape, with postulated refractive indices and particle size distributions (PSDs) similar to those found in nature for phytoplankton species.
3：List of Experimental Equipment and Materials:
The study uses computational models (BHMIE code for Lorenz–Mie theory, BART code for coated spheres, T-matrix code for cylinders) to simulate the optical properties of particles.
4：Experimental Procedures and Operational Workflow:
For each shape, the forward models compute inherent optical properties (IOPs) from postulated refractive indices, PSDs, and shapes. Inverse models then estimate refractive indices from IOPs, and the estimated values are compared with postulated ones to assess accuracy.
5：Data Analysis Methods:
The accuracy of each method is evaluated using averaged relative errors for the real and imaginary parts of the refractive indices and the volume scattering function.
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