Abstract
The term “electronography” is now accepted for the technique of recording an image of photoelectrons by projecting them directly on to a suitable photographic emulsion. If each photoelectron can be made to excite a grain of silver halide so that it can be subsequently developed to be equal in size to a grain directly excited by image photons, then it follows that the image tube will record “faster” than direct photography by the ratio of the detective quantum efficiencies of the photocathode and the photographic emulsion. Recording “speed” is the reciprocal of the exposure required to reach a given photographic density. Not only will the electronographic recording be faster than the direct photography but, even more important, the amount of information recorded will be greater by the same factor, which has been shown in Chapter 6 of this volume to be about 100.
This is a preview of subscription content, log in via an institution.
Buying options
Tax calculation will be finalised at checkout
Purchases are for personal use only
Learn about institutional subscriptionsPreview
Unable to display preview. Download preview PDF.
References
K. O. Kiepenheuer, Die Sterne 9, 190 (1934); Naturwiss. 19, 297 (1934).
A. Lallemand, C.R. Acad. Sci. (Paris) 203, 234, 290 (1936).
A. Lallemand, M. Duchesne, and G. Wlérick, in Advances in Electronics and Electron Physics, Vol. 12, ed. by J. D. McGee and W. L. Wilcock, Academic Press, New York (1960), p. 50.
J. S. Hall, W. K. Ford, Jr., and W. A. Baum, in Advances in Electronics and Electron Physics, Vol. 12, ed. by J. D. McGee and W. L. Wilcock, Academic Press, New York (1960), p. 21.
J. D. McGee, D. McMullan, H. Bacik, M. Oliver, in Advances in Electronics and Electron Physics, Vol. 28A, ed. by J. D. McGee, D. McMullan, E. Kahan, and B. L. Morgan, Academic Press, London (1969), p. 61.
M. F. Walker, Sky and Telescope 40, 132 (1970).
G. E. Kron, H. D. Abies, and A. V. Hewitt, in Advances in Electronics and Electron Physics, Vol. 28A, ed. by J. D. McGee, D. McMullan, E. Kahan, and B. L. Morgan, Academic Press, London (1969), p. 61.
E. Kahan and M. Cohen, in Advances in Electronics and Electron Physics, Vol. 28B, ed. by J. D. McGee, D. McMullan, E. Kahan, and B. L. Morgan, Academic Press, London (1969), p. 725.
Author information
Authors and Affiliations
Editor information
Editors and Affiliations
Rights and permissions
Copyright information
© 1971 Springer Science+Business Media New York
About this chapter
Cite this chapter
McGee, J.D. (1971). The Spectracon. In: Biberman, L.M., Nudelman, S. (eds) Photoelectronic Imaging Devices. Optical Physics and Engineering. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-2931-2_21
Download citation
DOI: https://doi.org/10.1007/978-1-4684-2931-2_21
Publisher Name: Springer, Boston, MA
Print ISBN: 978-1-4684-2933-6
Online ISBN: 978-1-4684-2931-2
eBook Packages: Springer Book Archive