|
Traditional measurement methods of volume scattering from algae particles can obtain the angular distribution of the scattered light intensity and retrieve the size information of the algae, but cannot be used to analyze the morphological parameters of planktonic algae. Measurement of polarized volume scattering can obtain the influence of the algae particle shape on its volume scattering Muller matrix. To evaluate the effect of morphological parameters on polarization scattering characteristics of planktonic algae particles, a preliminary experimental study was done with the polarization scattering theory of particles in water. The experiment took Isochrysis galbana as the sample and used a linearly polarized laser of 532 nm to irradiated pure sea water and the seawater solution of Isochrysis galbana. To obtain the scattering phase function of the samples under parallel and perpendicular polarization, an optical experiment platform consisting of a polarization state generator (PSG), a sample compartment and a polarization receiving compartment was used to measure the volume scattering of samples. The result shows that, compared with the measurement of pure seawater, the intensity of the parallelpolarized volume scattering from the seawater solution of Isochrysis galbana was significantly increased. Particularly, for backscattering at 120°, the parallel-polarized backscattering of the seawater with algae particles was enhanced. Combined with T-matrix method, a simulation of the polarized volume scattering of Isochrysis galbana was carried out with an approximation of morphological particles and to further verify the influence of the morphological parameters of planktonic algae on its polarization scattering function.
|
