title: [Off-axis cavity enhanced absorption spectroscopy detection techniques for the measurement of carbon dioxide].
abstract: The spectrum of carbon monoxide was obtained around 1. 573 microm using a tunable distributed feedback semiconductor laser with a high-finesse cavity at room temperature via off-axis cavity enhanced absorption (CEA) spectroscopic technique. The absorption line of carbon monoxide at 6 357. 311 6 cm(-1) was chosen for trace detection. Meanwhile, in order to get more accurate measurements, absorption path length of the cavity calibration methods was studied, and a simple and practical calibration method was given. The results show that, the equivalent absorption path length of high-precision optical resonator was -1 195.73 m. At last, we got the concentration of carbon monoxide in the real atmosphere to be -388.346 ppm (S/N = 22), and the detection limit of carbon monoxide was 17.65 ppm. By combination of wavelength modulation technology and OA-CEAS technology, a minimum detectable concentration of 0.36 ppm (S/N = 1 064) was achieved eventually.
authors.affiliation: Laboratory of Atmosphere Physcis & Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. zhhui08@mail.ustc.edu.cn
authors.forename: Hui
authors.initials: H
authors.lastname: Zhao
authors.forename: Gui-shi
authors.initials: GS
authors.lastname: Wang
authors.forename: Ting-dong
authors.initials: TD
authors.lastname: Cai
authors.forename: Xiao-ming
authors.initials: XM
authors.lastname: Gao