[Off-axis cavity enhanced absorption spectroscopy detection techniques for the measurement of carbon dioxide].
Guang Pu Xue Yu Guang Pu Fen Xi
; 32(1): 41-5, 2012 Jan.
Article
em Zh
| MEDLINE
| ID: mdl-22497123
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.
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Base de dados:
MEDLINE
Idioma:
Zh
Ano de publicação:
2012
Tipo de documento:
Article