藻類水體離水輻射光譜的熒光偏振識別研究
[Abstract]:Algae and other phytoplankton proliferate in eutrophication water, but the percentage of chlorophyll in algae cells is stable. Therefore, chlorophyll concentration is an important index to reflect the eutrophication degree of eutrophication. Chlorophyll molecules in algae cells emit chlorophyll fluorescence in the form of energy release after absorption of light energy, so chlorophyll fluorescence can be used as an important parameter to approximate estimate chlorophyll concentration. Accurate extraction of chlorophyll fluorescence from off-water radiation has great theoretical significance and wide application prospect for remote sensing monitoring of chlorophyll concentration in water body and evaluation of water environment. In the atmospheric ocean system, the incident solar light will be scattered by various molecules, aerosols and hydrosol in the atmospheric ocean system, and also reflected by the sea surface. These processes will change the polarization state of the light. The scattered and reflected sunlight is partially polarized and contains information that can reflect the essential characteristics of aerosols and suspended matter in atmospheric and oceanic systems. The elastic scattering light of particulate matter in water is partially polarized, while chlorophyll fluorescence is non-polarized light. Based on this characteristic and using polarization technique, fluorescence can be separated from the information of total off-water radiation, so that the chlorophyll concentration can be retrieved by remote sensing. However, it is not clear whether this method can be applied to the inshore complex water. Based on this, the different chlorophyll concentration, inorganic particle concentration and incident angle of light source are analyzed by polarization measurement system. The influence of wind on the polarization separation method. In this paper, Chlorella aurantia, Chlorophyta roxburghii and Prorocentrum were selected as experimental algae. The experiment of chlorophyll fluorescence polarization separation under indoor conditions was carried out by means of ground object spectrometer combined with polarizer. The results show that the measurement results are more reliable when the incident zenith angle of the light source is 30 擄-60 擄, and the separation effect is the best when the incidence angle is 45 擄. For algae with different concentrations of chlorophyll, chlorophyll fluorescence can be well separated, but when the concentration of chlorophyll is too low, the error of the separation results is larger, compared with that of high concentration of chlorophyll water, the separation results are more reliable. For algae with different concentrations of inorganic particles, the fluorescence summit showed a decreasing trend with increasing concentration, but when the concentration of particulate matter reached 3 脳 105mg/m3, the inversion results were still reliable. In the case of surface wind, the measured spectral curves fluctuate greatly, but do not affect the fluorescence separation. At the same time, the polarization measurements of red tide water and suspended sediment water are also carried out in Qinhuangdao Sea area. The results show that the polarization separation fluorescence method is still applicable to the red tide water. The results show that the polarization method of chlorophyll fluorescence separation is of great significance for remote sensing detection of chlorophyll concentration and red tide monitoring in coastal waters. In this paper, the relationship between polarization spectral characteristics and remote sensing reflectance is compared and analyzed for the measurement of suspended sediment in situ. It is found that the upstream radiance polarization degree and remote sensing reflectance spectrum are inversely related to each other, which indicates that in the aspect of obtaining ocean water color information, The degree of polarization has a capability similar to that of remote sensing reflectivity.
【學位授予單位】:大連海事大學
【學位級別】:碩士
【學位授予年份】:2017
【分類號】:X52
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