Investigation of atmospheric {text{O}}_{2}{text{X}}{^{ 3}}{ sum_{text{g}}^{ - }} ,{text{to}}, {text{b}}{^{ 1}}{ sum_{text{g}}^{ + }} using open-path tunable diode laser absorption spectroscopy |
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Authors: | Christopher A. Rice Kevin C. Gross Glen P. Perram |
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Affiliation: | 1. Department of Engineering Physics, Air Force Institute of Technology, 2950 Hobson Way, Wright-Patterson Air Force Base, OH, 45433, USA
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Abstract: | A tunable diode laser absorption spectroscopy (TDLAS) device fiber coupled to a pair of 12.5 in. telescopes was used to study atmospheric propagation for open path lengths of 100–1,000 meters. More than 50 rotational lines in the molecular oxygen A-band O2 $ {text{X}}{^{ 3}}{ sum_{text{g}}^{ - }} ,{text{to}}, {text{b}}{^{ 1}}{ sum_{text{g}}^{ + }} $ transition near 760 nm were observed. Temperatures were determined from the Boltzmann rotational distribution to within 1.3 % (less than ±2 K). Oxygen concentration was obtained from the integrated spectral area of the absorption features to within 1.6 % (less than ±0.04 × 1018 molecules/cm3). Pressure was determined independently from the pressure-broadened Voigt lineshapes to within 10 %. A fourier transform interferometer (FTIR) was also used to observe the absorption spectra at 1 cm?1 resolution. The TDLAS approach achieves a minimum observable absorbance of 0.2 %, whereas the FTIR instrument is almost 20 times less sensitive. Applications include atmospheric characterization for high energy laser propagation and validation of monocular passive raging. |
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