An Ultraviolet Intensity Meter for Field Use

Abstract
The authors describe a meter specifically designed for measuring the u.-v. output of mercury vapor lamps which have been installed for germicidal purposes. Inasmuch as this u.-v. radiation is usually present mixed with daylight, a photocell was used which has a high response to 2537 A and insignificant sensitivity to wave lengths longer than 3000 A. The WL-775 was found to be satisfactory. A 1G6G was used to couple the photocell to a microammeter. The completed instrument has a maximum sensitivity of 0.01 microwatts per scale division of the balancing potentiometer (100 at full scale).

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