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A Hemispherical Photometric Integrator

Name: A Hemispherical Photometric Integrator
Creator: Benford, Frank

descriptionPublicationkeyboard_double_arrow_right Article 01 Dec 1922 English Publisher:Optica Publishing GroupJournal:Journal of the Optical Society of America, volume 6, page 1,040 (issn: 0030-3941,

Authors: Benford, Frank;

doi: 10.1364/josa.6.001040

A Hemispherical Photometric Integrator

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Abstract

SYNOPSISA study of the errors in spherical photometry due to the presence of the lamps and screens in the Ulbricht sphere led to the development of a fixed convex mirror to be used in place of the two larger screens. A further development of the theory of interference within the instrument led to the adoption of a hemisphere in place of the complete sphere. It is shown how the instrument is calibrated and used for the testing of(a) Reflectors for indoor or street illumination(b) Large searchlights(c) Small searchlights, headlights, etc.(d) Motion picture projectors(c) High intensity arcs (for brilliancy).The various accessories that go with the instrument are described and illustrated

Related Organizations

Ericsson (Sweden)
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General Electric (United States)
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