Diode laser spectroscopy using a multipass gas cell in a controlled environment chamber

CHED 182

David H. Ashley, wolverine_dha@hotmail.com, Department of Physical Science, Harding University, HU Box 10041, 915 East Market Avenue, Searcy, AR 72149 0041
A Mars atmosphere simulation chamber was designed and built to measure biogenic gases under conditions similar to those on Mars. Temperatures were varied in the range -100°C to +20°C and total pressures varied between 5 and 12 millibars. The chamber housed a Herriott folded mirror gas cell that could be adjusted to give optical pathlengths between 50 and 100 meters. Near-infrared diode lasers were used as the spectral source for the absorption measurements.