The limits of detectability of a low-light-level point-source sensor as a function of telescope aperture, sensor resolution, night-sky background, and pre-readout electron gain

Details The limits of detectability of a low-light-level point-source sensor as a function of telescope aperture, sensor resolution, night-sky background, and pre-readout electron gain The limits of detectability of a low-light-level point-source sensor as a function of telescope aperture, sensor resolution, night-sky background, and pre-readout electron gain

Aug 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974ldll.rept.....w&link_type=abstract

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Physics

Optics

Radiation Detectors, Solar Radiation, Telescopes, Electro-Optics, Light Sources, Remote Sensors, Television Systems

Scientific paper

Based on laboratory measurements and on field experience in detecting G-type stars and point-objects by reflected sunlight, a figure of performance of a low-light-level sensor operating continuously at standard TV rates and incorporating a variable pre-readout current gain of 20,000 has been developed and extrapolated to specify limiting detectable point-source visual magnitudes for telescope apertures ranging from 7 in. to 400 in., and for image-cell angular diameters from 0.5 to 60.0 sec. The detection criterion, expressed in video SNR, is that the point-source images in typical real-sky situations be detectable on the screen of a video monitor (with essentially 100% probability of detection) by a human observer. After three limiting cases are discussed, camera-tube saturation is considered. Levels are determined for the present sensor and for sensors of the future. (Modified author abstract)

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