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Instrument: ARGUS : Two-Channel Atmospheric Tracer Instrument
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ARGUS is a two channel, tunable diode laser instrument set up
for the simultaneous, in situ measurement of CO (carbon
monoxide) and CH4 (methane) in the troposphere and lower
stratosphere. The instrument measures 40 x 30 x 30 cm and weighs
21 kg. An auxiliary, in-flight calibration system has dimensions
42 x 26 x 34 cm and weighs 17 kg. The instrument is an
absorption spectrometer operating in rapid scan, second-harmonic
mode using frequency-modulated tunable lead-salt diode lasers
emitting in the mid-infrared.