Abstract
view Abstract Citations References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Facts and Myths Concerning Image Tubes. Baum, William A. Abstract For the blue region of the spectrum commonly used in astronomical spectroscopy, the gain of image tubes over the best unaided photographic emulsions cannot exceed a factor of about 20. The larger figures often quoted are fundamentally impossible. Electronographic tubes, cascaded converters, and mica-window converters offer the best hopes for actually achieving gains of 10 or more. Present performance is not consistently as good as this but is progressively improving. Imaging photomultipliers are running somewhat behind, and scanning tubes (such as the image orthicon) are the poorest of the candidates. When various image tubes are being compared with one another and with unaided photography, their performance must be judged in terms of their relative "information rates." Separate figures on resolution and speed-gain can be misleading. Publication: The Astronomical Journal Pub Date: 1964 DOI: 10.1086/109384 Bibcode: 1964AJ.....69Q.532B full text sources ADS |
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