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Solar concentrators generate energy according to the amount of radiant flux that is converted into electrical energy using a solar cell. The optimal alignment of the solar cell and the aperture stop of the concentrator photovoltaic (CPV) solar system is a critical parameter for fabricating and manufacturing steps. We designed, developed, fabricated, and verified an optoelectronic system to test alignment of CPV solar system modules that is portable and robust to implement as a step in the assembly line. In addition to the components employed in systems previously, we implement an alignment module. It consists of a thin prism in four orientations in a plane normal to the optical axis of the unit under test and its control system. Its advantage is robustness against its positioning and orientation errors. Simulations and experimental results are presented.
Feasibility of planet detection in two-planet solar system with rotationally-shearing interferometer
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This course will provide attendees with a basic working knowledge of radiometric concepts. Radiometry deals with generation, propagation, modification, and detection of radiation. It is based on the generation of radiation in matter, propagation through a partially transmissive 3-dimensional space, and detection in matter. Many practical and useful examples are included throughout. While the geometrical concepts employed in radiometry often imply detailed calculations, useful and reasonable approximations will be emphasized.
The following topics will be included:
• Concepts of geometrical optics (ray, beam, optical system, object and image similarity)
• Generation of radiation: sources
• Detection of radiation
• Spatial extent of sources: point and extended sources
• Geometry of sources and detectors
• Directional properties of sources and detectors
• Angle, projected angle, solid angle, and projected solid angle
• Spectral and radiative characteristics of sources (power)
• Spectral characteristics of sources and detectors
• Derived radiometric quantities and units: radiance, exitance (emittance), incidence (irradiance), intensity
• Blackbody radiators and emissivity
• Planck´s law, Wien´s law, Stefan-Boltzmann´s law, and Kirchoff´s law
• Stray light, and configuration factors
• Two invariants of optical systems: throughput (etendue) and radiance
• Loss of information between plane 1 and plane 2
• Radiance at the sensor
• Detected radiance
Multispectral imagery contains a wealth of information beyond panchromatic imagery. This course describes and evaluates computer processing techniques used to extract information from multispectral imagery. The emphasis is on earth remote sensing, but the techniques discussed apply to any multispectral imagery.
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