Spot Sensitometer For Astronomical Use

R. P. Edwin

doi:10.1117/12.934384

16 June 1983 Spot Sensitometer For Astronomical Use

R. P. Edwin

Proceedings Volume 0369, Max Born Centenary Conf; (1983) https://doi.org/10.1117/12.934384
Event: The Max Born Centenary Conference, 1982, Edinburgh, United Kingdom

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%.

Citation Download Citation

R. P. Edwin "Spot Sensitometer For Astronomical Use", Proc. SPIE 0369, Max Born Centenary Conf, (16 June 1983); https://doi.org/10.1117/12.934384

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