Research on Improving Sensitivity of the Characteristic Spectrnm in Micro-Gas Monitor
SUN Yun-qiang, LU Xu-tao
1. National Key Laboratory for Electronic Measurement Technology of North University of China, Taiyuan 030051, China 2. Technical Industry Place of North University of China, Taiyuan 030051, China
Abstract：In order to realize the indoor micro noxious gas real-time monitor, and enhance measuring accuracy based on the characteristic spectrum examination method, a characteristic wavelengths filtration window was designed, in which the container is full with the highly concentrated testing gas. The container with the highly concentrated testing gas was used as the filtration window, the standard air as the reference window, the air chamber sufficient testing gas for testing density. The experiment demonstrated that using the WQF-520-FTIR infrared spectroscope to obtain the infrared absorption spectrum of dipropyl sebacate, there were mainly four characteristic wavelength lines: 3.385 26, 3.417 64, 5.797 11, and 8.561 65 μm, and the corresponding extinction was 1.520 0, 1.542 1, 2.431 8 and 1.352 6 respectively. The smallest content examined was 50 ppb, but using the characteristic wavelengths filtration window, the method could realize the 10-4 nm magnitude alignment. The sensitivity was enhanced nearly 10 times, and the characteristic wavelengths filtration window method has the merits of high sensitivity, no discontinuity, real-time examination, and so on.
Key words：Characteristic spectrnm;Characteristic wavelengths filtration window;Micro gas examination;Noxious gas;Dipropyl sebacate
孙运强1,2，鲁旭涛1 . 提高特征光谱法在微量气体监测中灵敏度的研究 [J]. 光谱学与光谱分析, 2010, 30(07): 1890-1893.
SUN Yun-qiang, LU Xu-tao . Research on Improving Sensitivity of the Characteristic Spectrnm in Micro-Gas Monitor . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2010, 30(07): 1890-1893.
