Measurement of solar radiation over a wide spectral range is necessary to effectively monitor the earth's atmosphere. Current radiometers capable of measuring light intensity in multiple wavelength bands are bulky, heavy (when using moving parts such as mechanical scanners or rotating arms) and, because of optical filter drift, cannot produce consistent results, especially for long term operation under field conditions. This project will develop a compact, low cost, lightweight Surface Optical Reflectance Meter (SORM) based on a thin stack of envi-ronmentally stable reflection holographic filters and a lightweight two-dimensional liquid crystal panel. The system will address such problems as drift, sensitivity, field-of-view, wide spectral range, and compatibility with existing system components. The Phase I project designed the SORM components, analyzed their performance, verified the concept by experimental demonstration, and investigated the fabrication process by which the processed system can be manufactured. Feasibility of the proposed concept was demonstrated. Phase II will optimize the design and develop a fully-operational SORM prototype system, including the scanner and the stacked holographic filters.

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