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Calibration Of UV Imagers

Digital photometry of point-like images has been developed for the calibration of image systems sensitive to the UV and visible wavelengths and which use RS170 video. The photometry algorithm integrates the total net brightness signal over the area of the image. A threshold is determined based on the noise statistics in the image in order to separate signal from a noisy background. The response of this algorithm is linear with respect to brightness over a dynamic range of at least 3000 to 1.