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2. SYSTEM DESCRIPTION
2
SYSTEM DESCRIPTION
The Brewer MKIII Spectrophotometer is an optical instrument designed to measure ground-level
intensities of the attenuated solar ultraviolet (UV) radiation. The Brewer contains two modified
Ebert f/6 spectrometers, each utilizing 3600 line / mm holographic diffraction gratings operated in
the first order.
The Brewer is designed for continuous outdoor operation and is therefore housed in a durable
weatherproof shell which protects the finely-tuned internal components. The instrument operates
reliably and accurately over a wide range of ambient temperature and humidity conditions.
Following is a brief description of the the major mechanical, optical, and electronic assemblies
which make up the basic instrument. A more complete description of the electronic assemblies is
provided in the Brewer Maintenance Manual.
The Brewer system is comprised of a Spectrophotometer, a Solar Tracker, and Computer
equipment running Brewer control and data logging software.
Figure 2.1: Top View of Brewer Cover
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MKIII OPERATOR'S MANUAL
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