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Proceedings Paper

The U.T. ELECTROGRAPHIC Camera: A Powerful Detector For Ground Based And Space Astronomy Description And Astronomical Performance
Author(s): Paul J. Griboval
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Paper Abstract

The U.T. Electrographic camera is the result of nearly 12 years of research undertaken to produce a high resolution and sensitivity detector for astronomy, yet reliable and easy and fast to operate. The Mark II experimental camera has a 5 cm useful field diameter and is equipped with a Cs3Sb(0) photocathode with typical Q.E. of 15% at 430 nm. The highly corrected magnetic and electric fields produce sharp focus on the entire field with no image distortion. An aluminized thin plastic foil, which comes in intimate contact with the emulsion, prevents photocathode poisonning during the exposure. The camera is operated at accelerating voltages up to 60 kV with no detectable background in a 2 hour exposure. The design permits fast loading and unloading. The camera is being tested extensively at the F/13.5 cassegrain focus of the McDonald Observatory 0.76 m telescope and hundreds of excellent electrographs have been obtained under routine conditions. The high resolution and photocathode Q.E. permitted recording more rapidly and accurately the telescopic images of various astronomical objects. Testing will be continued until enough information is gained for designing and building, upon adequate support, a large field electrographic ca-mera with a roll film magazine and a higher Q.E. photocathode for both ground based and space telescopes.

Paper Details

Date Published: 3 May 1979
PDF: 15 pages
Proc. SPIE 0172, Instrumentation in Astronomy III, (3 May 1979); doi: 10.1117/12.957101
Show Author Affiliations
Paul J. Griboval, McDonald Observatory of the University of Texas (United States)

Published in SPIE Proceedings Vol. 0172:
Instrumentation in Astronomy III
David L. Crawford, Editor(s)

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