Abstract

A field photometer consisting of a single photomultiplier tube and nine-element filter wheel has been designed and used to study low-light levels of the order of 10−11 W cm−2 sr−1. The filter wheel can be operated up to 10 rps to give data from each spectral region at a rate of 10 times per second. Light is collected by a 500 mm diam, f/1.1 parabolic mirror and, after being rendered parallel by a suitable lens system, passes through filters to a photomultiplier. A description and operating characteristics of the instrument are given. Sample data taken on a recent field test are presented, as are photographs of key items in the instrument.

© 1964 Optical Society of America

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