›› 2014, Vol. 23 ›› Issue (10): 107104-107104.doi: 10.1088/1674-1056/23/10/107104

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Transverse Zeeman background correction method for air mercury measurement

李传新a b, 司福祺b, 刘文清b, 周海金b, 江宇b, 胡仁志b   

  1. a Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China;
    b Key Laboratory of Environmental Optics and Technology. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
  • 收稿日期:2013-11-13 修回日期:2014-05-27 出版日期:2014-10-15 发布日期:2014-10-15
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 41275037), the Science-Technology Foundation for Young Scientist of Anhui Province, China (Grant No. 1308085JGD03), and the Anhui Provincial Natural Science Foundation, China (Grant No. 1308085QF124).

Transverse Zeeman background correction method for air mercury measurement

Li Chuan-Xin (李传新)a b, Si Fu-Qi (司福祺)b, Liu Wen-Qing (刘文清)b, Zhou Hai-Jin (周海金)b, Jiang Yu (江宇)b, Hu Ren-Zhi (胡仁志)b   

  1. a Department of Optics and Optical Engineering, University of Science and Technology of China, Hefei 230026, China;
    b Key Laboratory of Environmental Optics and Technology. Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
  • Received:2013-11-13 Revised:2014-05-27 Online:2014-10-15 Published:2014-10-15
  • Contact: Si Fu-Qi E-mail:sifuqi@aiofm.ac.cn
  • About author:71.70.Ej; 96.30.Dz; 96.50.Bh; 43.38.Ne
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 41275037), the Science-Technology Foundation for Young Scientist of Anhui Province, China (Grant No. 1308085JGD03), and the Anhui Provincial Natural Science Foundation, China (Grant No. 1308085QF124).

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摘要： By utilizing a natural mercury lamp, the transverse Zeeman background correction method, which is used for trace mercury measurement in air, is studied. In this paper, a natural mercury lamp is used as a light source, and is placed in a 1.78-T magnetic field. The lamp emits two linearly polarized light beams σ± and π of 253.65-nm resonance line, which are used as bias light and absorbing light, respectively. A polarization modulation system is used to allow σ ± and π light beams to pass through alternately with a certain frequency. A multipath optical cell with 12-m optical path is used to increase optical distance. Based on the system described above, the influence caused by UV absorbing gases, such as NO2, SO2, acetone, benzene, and O3, is analyzed. The results show that it may reduce the detection limit when the concentrations of these gases exceed 83.4 ppm, 20.3 ppm, 142.3 ppm, 0.85 ppm, and 0.55 ppm, respectively. The detection limit of the system is calculated and can achieve up to 1.44 ng/m3 in 10 minutes. Measurements on mercury sample gas and air are carried out, and the measured data are compared with the data of RA-915 mercury analyzer (Russia). The result shows that the correlation coefficient reaches up to 0.967. The experimental results indicate that the transverse Zeeman background correction method can be used to quantify trace mercury in air with high-precision.

关键词: transverse Zeeman background correction, natural mercury lamp, magnetic field, multipath optical cell

Abstract: By utilizing a natural mercury lamp, the transverse Zeeman background correction method, which is used for trace mercury measurement in air, is studied. In this paper, a natural mercury lamp is used as a light source, and is placed in a 1.78-T magnetic field. The lamp emits two linearly polarized light beams σ± and π of 253.65-nm resonance line, which are used as bias light and absorbing light, respectively. A polarization modulation system is used to allow σ ± and π light beams to pass through alternately with a certain frequency. A multipath optical cell with 12-m optical path is used to increase optical distance. Based on the system described above, the influence caused by UV absorbing gases, such as NO2, SO2, acetone, benzene, and O3, is analyzed. The results show that it may reduce the detection limit when the concentrations of these gases exceed 83.4 ppm, 20.3 ppm, 142.3 ppm, 0.85 ppm, and 0.55 ppm, respectively. The detection limit of the system is calculated and can achieve up to 1.44 ng/m3 in 10 minutes. Measurements on mercury sample gas and air are carried out, and the measured data are compared with the data of RA-915 mercury analyzer (Russia). The result shows that the correlation coefficient reaches up to 0.967. The experimental results indicate that the transverse Zeeman background correction method can be used to quantify trace mercury in air with high-precision.

Key words: transverse Zeeman background correction, natural mercury lamp, magnetic field, multipath optical cell

中图分类号:  (Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)

  • 71.70.Ej
96.30.Dz (Mercury) 96.50.Bh (Interplanetary magnetic fields) 43.38.Ne (Mechanical, optical, and photographic recording and reproducing systems)