| Wide-Field Imaging With Mosaic Ccd Cameras (2007) | |||||||||||||
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| An outline is given of our development of mosaic CCD cameras. Hardware and data reduction software of two operational cameras are described. Scientific objectives of wide-field imaging with the cameras are briefly described. Key Words : mosaic CCD camera, imaging I. INTRODUCTION AND BACKGROUND Around 1988, when we started the development of a mosaic CCD camera, CCDs available at a reasonable price were 1K chips that had a size of about 1 cm 2 . Schmidt photographic plates, on the other hand, had a size of about 1000 cm 2 . If we define the survey efficiency by (sensitivity) \Theta (detector area), even with a 100 times higher sensitivity, CCDs could not cope with photographic plates. The increase of the effective area of CCDs by mosaicking was of critical importance for wide-field surveys (e.g., Kron 1995). There were two approaches to the CCD mosaicking. One was the `as-close-as-possible' approach that was based on abuttable CCDs. The other was the `amplegap ' approach which us... | |||||||||||||
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