Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986spie..627..610c&link_type=abstract
IN: Instrumentation in astronomy VI; Proceedings of the Meeting, Tucson, AZ, Mar. 4-8, 1986. Part 2 (A87-36376 15-35). Bellingha
Astronomy and Astrophysics
Astronomy
Counting Circuits, Image Intensifiers, Photocathodes, Photoelectrons, Photons, Signal To Noise Ratios
Scientific paper
A summary is given of measurements of the photoelectron counting efficiency of a variety of image intensifiers manufactured by several different manufacturers. Typically, only slightly over half of the photoelectrons from the first photocathode produce a detectable signal on the output phosphor screen in most diode-type intensifiers. For microchannel plate intensifiers, the counting efficiency is even less. Results are given of experiments intended to produce diode-type intensifiers having improved counting efficiency. Improvements have been achieved through refinements in the manufacturing steps of the phosphor screen, the tube component being identified as resonsible for the lost photoelectron pulses in diode-type tubes. The best tubes so far have counting efficiencies of 70 percent, which represents an improvement by a factor of about 1.4.
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