Chinese Optics Letters, 2012, 10 (4): 041404, Published Online: Jan. 5, 2012
Quantum cascade laser-based spectrometer for high sensitive measurements of trace gases in air Download: 867次
140.5965 Semiconductor lasers, quantum cascade 300.6340 Spectroscopy, infrared 280.1120 Air pollution monitoring
Abstract
A quantum cascade (QC) laser-based spectrometer is developed to measure trace gases in air. The proposed spectrometer is tested for N2O, 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 N2O sampled from ambient air shows the applicability of the proposed system for the field measurements of gases of environmental concern.
Yuanyuan Tang, Wenqing Liu, Ruifeng Kan, Yujun Zhang, Dong Chen, Shuai Zhang, Jun Ruan. Quantum cascade laser-based spectrometer for high sensitive measurements of trace gases in air[J]. Chinese Optics Letters, 2012, 10(4): 041404.