Spectral sensing technique for water constituents.
Item
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Title
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Spectral sensing technique for water constituents.
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Identifier
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AAI3213252
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identifier
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3213252
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Creator
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Zhou, Jing.
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Contributor
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Adviser: Fred Moshary
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Date
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2006
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Language
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English
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Publisher
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City University of New York.
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Subject
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Engineering, Marine and Ocean | Physics, Optics
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Abstract
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Spectral measurements of optical properties of water were conducted throughout the Chesapeake Bay area during the 2005 summer cruise campaign. This included reflectance, absorption, attenuation and backscattering spectra. The analysis of the data illustrates the diversity and complexity of constituents that shape spectral features of the coastal water. A novel technique is proposed to separate the chlorophyll fluorescence component from the reflectance spectra of algae contained water. This approach utilizes of polarization properties of elastically scattered light and the unpolarized nature of fluorescence and was successfully applied to measurements of various algae species first in lab and later in field measurements. The efficiency and limitation of this approach has been further examined under various conditions as well as through vector radiative transfer modeling. Finally Twomey Iterative Method (TIM) has been applied to the retrieval of hydrosol microphysical properties for the first time. Assuming a known refractive index, both single and multi-mode distributions were successfully retrieved from both simulation and experiments through the introduction of an initial distribution biased towards larger particles. In addition, the technique is extended to the retrieval of an unknown refractive index, which is also validated using both simulation and experimental results.
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
