文献类型：期刊文献

英文题名：Improved approach for ultra-sensitive detection of NO

作者：Yixian Qian[1]; Huijuan Sun[2]

第一作者：Yixian Qian

机构：[1] Inst. of Inf. Opt., Zhejiang Normal Univ., Jinhua, China; [2] Basic Courses Dept., Beijing Union Univ., Beijing, China

第一机构：Inst. of Inf. Opt., Zhejiang Normal Univ., Jinhua, China

年份：0

卷号：19

期号：2

起止页码：739-47

外文期刊名：Optics Express

收录：EI(收录号：11779444)

语种：英文

外文关键词：Faraday effect - gas sensors - nitrogen compounds - optical modulation - optical sensors - refractive index - ultraviolet spectra - ultraviolet spectroscopy

摘要：An improved approach has been developed for ultra-sensitive detection of the concentration of NO using Faraday Modulation spectrometry (FAMOS) combined with the strong electronic transition. By changing the modulating magnetic field attributing to linear absorption and refraction of gas sample, the polarized laser was rotated and absorbed by the complex refraction index of NO. We confirm the relation between the magnitudes of absorption and the optimum modulation magnetic field. Also, the accuracy and the precision of the technique have been evaluated at different pressures. It is shown that the system is capable of detecting NO concentration down to 0.34 ppb·m.