Compact highly sensitive multi-species airborne mid-IR spectrometer
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We report on the development and airborne field deployment of a mid-IR laser-based spectrometer. The instrument was configured for the simultaneous in situ detection of formaldehyde (CH2O) and ethane (C2H6). Numerous mechanical, optical, electronic, and software improvements over a previous instrument design resulted in reliable highly sensitive airborne operation with long stability times yielding 90 % airborne measurement coverage during the recent air quality study over the Colorado Front Range, FRAPPÉ 2014. Airborne detection sensitivities of ~15 pptv (C2H6) and ~40 pptv (CH2O) were generally obtained for 1 s of averaging for simultaneous detection.
KeywordsAmplify Spontaneous Emission Periodically Pole Lithium Niobate Difference Frequency Generation Tunable Laser Source Periodically Pole Lithium Niobate Crystal
We wish to thank Dr. Peter Bernath at Old Dominion University for providing us with the latest ethane spectroscopic database as well as high-resolution spectra for potential interferences on our C2H6 channel. We also wish to acknowledge Dr. Eric Apel at NCAR for providing us with various calibration gas mixtures, and Gary Granger at NCAR for his significant contribution to the software development.
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