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Abstract

In this thesis is described the testing and installation of a
Spectracon image tube at the focus of the Coudé spectrograph associated
with the University of Tasmania's 16 inch (40 em) reflecting telescope
at Canopus Hill Observatory. The tube's performance is described in
terms of its limiting resolution and its speed relative to direct
photography with Kodak IIa-0 emulsion. On both counts the tube was
below expectation. In addition measurements of the linearity of
response are presented and a qualitative assessment is made of photo-cathode
uniformity. A stellar spectrum taken with the Spectracon is
also presented.
Ancillary equipment is discussed and a simple film-handling technique
is analysed in terms of dimensional stability in the film.
The description of tube testing and installation is preceded by
sections based on reading research. The thesis opens with a review
of the development of image tubes for astronomy which covers electronographic,
phosphor-output and signal-generating (TV-type) tubes. This
is followed by a discussion of the process of electronography and the
properties of electron-sensitive emulsions that are of particular
interest to astronomers. A third chapter presents a detailed description
of the Spectracon image tube and gives an account of its expected
performance.
The thesis concludes with the recommendations that another
Spectracon be acquired to fulfil the role envisaged for the tube
described in the thesis, and that an electronographic image tube facility
be developed to fully exploit the advantages of electronography in the
area of field photometry.

Item Type:	Thesis - Coursework Master
Authors/Creators:	King, David John
Keywords:	Astronomical spectroscopy, Image converters
Copyright Holders:	The Author
Copyright Information:	Copyright 1974 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).
Additional Information:	Includes bibliography. Thesis (M.Sc.) - University of Tasmania, 1975
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