Abstract
A quantum cascade (QC) laser-based spectrometer is developed to measure trace
gases in air. The proposed spectrometer is tested for N<sub>2</sub>O, and the results presented
in this letter. This system takes advantage of recent technology in QC lasers by
utilizing intra-pulse scan spectroscopy, which allows high sensitive measurement.
Without calibration gases, the gas concentration can be calculated with scan
integration and the corresponding values from the HITRAN04 database. By analyzing
the Allan variance, a detection limit of 2 ppb is obtained. Continuous measurement
of N<sub>2</sub>O sampled from ambient air shows the applicability of the proposed system for
the field measurements of gases of environmental concern.
© 2012 Chinese Optics Letters
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