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Proceedings Paper

Spot Sensitometer For Astronomical Use
Author(s): R. P. Edwin
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Paper Abstract

A sensitometer has been commissioned for the photometric calibration of spectroscopic and wide field astronomical plates. A set of illuminated apertures of various diameters illuminate a corresponding set of apertures all of equal diameter located immediately in front of emulsions. Twenty calibration spots in irradiance steps of 1.27 are exposed on to each plate. Burr-free apertures of precise diameter were photo-etched in thin foil. During periodic calibrations, a fibre-optic feed system is coupled to a photon counting photomultiplier. The instrument is spectrally neutral and spot irradiance ratios are calibrated to within 1%.

Paper Details

Date Published: 16 June 1983
PDF: 4 pages
Proc. SPIE 0369, Max Born Centenary Conf, (16 June 1983); doi: 10.1117/12.934384
Show Author Affiliations
R. P. Edwin, University of St. Andrews (Scotland)

Published in SPIE Proceedings Vol. 0369:
Max Born Centenary Conf
M. John Colles; D. William Swift, Editor(s)

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