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A MODULATED LAMP SYSTEM FOR SOLAR UV‐B (280‐320 nm). SUPPLEMENTATION STUDIES IN THE FIELD
Author(s) -
Caldwell M. M.,
Gold W. G.,
Harris G.,
Ashurst C. W.
Publication year - 1983
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.1983.tb04503.x
Subject(s) - thermal emittance , materials science , radiation , optics , environmental science , optoelectronics , physics , beam (structure)
Precise control and modulation of fluorescent sunlamps are necessary for ecologically valid simulation of solar UV‐B (280‐320 nm) radiation enhancement which would correspond to ozone reduction. A control system is described which allows lamp emittance to be modulated over a large dynamic range (50:1), permits stable lamp operation and starting at low temperatures, and provides a sensitive feedback loop to compensate for both atmospheric conditions, such as cloud cover, as well as changes in radiant emittance from the lamps resulting from factors such as temperature and lamp age.