An Ultraviolet Flashlight for Illuminating Fluorescent Charts.
NAVAL RESEARCH LAB WASHINGTON D C
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A flashlight adaptation of an ultraviolet UV source has been made with a batteryconverter supply powering a mercury vapor lamp. Two D-size common flashlight batteries power a single dc-ac modified Royer inverter whose output drives the UV lamp. The small circular UV fluorescent mercury-glow-discharge lamp is powered by a roughly 250-V square wave. It is eye safe. Illumination is confined to several square inches to preserve security in the presence of visible reradiation from the fluorescent map surface. The continuous operation capability exceeds 10 hr above roughly 50F. Author
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