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Instrument: ATLAS : Airborne Tunable Laser Absorption Spectrometer
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Description
The Airborne Tunable Laser Absorption Spectrometer (ATLAS) uses
a tunable laser to detect a target gas such as N2O, methane,
carbon monoxide, or ozone. The laser source is tuned to an
individual roto-vibrational line in an infrared absorption band
of the target gas, and is frequency modulated at 2 kHz. The
instrument detects the infrared target gas by measuring the
fractional absorption of the infrared beam from the tunable
diode laser.

Additional information available at
http://www.dfrc.nasa.gov/Research/AirSci/ER-2/pi_inst.html

[Summary provided by NASA]