Bergknappweiher, Copyright: P. Sharma.
Water is one of the most important natural resources on our planet and needs to be protected and managed in a sustainable way. Remote sensing of water offers the opportunity to monitor water bodies and to derive information on biological and physical parameters, such as type and concentrations of water constituents or properties of the shallow areas (ground cover, water depth). Measurements can be performed on ship, aircraft, UAV or satellite, but they all require algorithms that connect the detected signal with optical properties of water constituents and ground cover.
One of the biologically most important water constituents is phytoplankton due to its major contribution to primary production and its role as an oxygen producer and nutrient carrier in aquatic systems. Accurate species-dependent measurements of the optical properties can be made only in the laboratory using pure cultures. However, its optical properties can vary strongly according to ambient light conditions during growth. To simulate the natural light conditions in the laboratory, a light source is needed which provides a defined but tunable spectrum. Nowadays light emitting diodes (LEDs) are available in a broad range of wavelengths. The goal of this thesis is to construct a module which comprises of a set of LEDs that are on a spectral scale equally distributed in the range of photosynthetical available radiation (400-700 nm). This device should be able to produce a tunable spectrum using a modelled spectrum as input. It should be configured for two applications: illuminating phytoplankton cultures during growth and field sensors for calibration purposes.
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