Transverse Zeeman background correction method for air mercury measurement

doi:10.1088/1674-1056/23/10/107104

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.

Keywords: transverse Zeeman background correction natural mercury lamp magnetic field multipath optical cell

Received: 13 November 2013
Revised: 27 May 2014
Accepted manuscript online:

PACS:	71.70.Ej	(Spin-orbit coupling, Zeeman and Stark splitting, Jahn-Teller effect)
	96.30.Dz	(Mercury)
	96.50.Bh	(Interplanetary magnetic fields)
	43.38.Ne	(Mechanical, optical, and photographic recording and reproducing systems)

Fund: 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).

Corresponding Authors: Si Fu-Qi
E-mail: sifuqi@aiofm.ac.cn

About author: 71.70.Ej; 96.30.Dz; 96.50.Bh; 43.38.Ne

Cite this article:

Li Chuan-Xin (李传新), Si Fu-Qi (司福祺), Liu Wen-Qing (刘文清), Zhou Hai-Jin (周海金), Jiang Yu (江宇), Hu Ren-Zhi (胡仁志) Transverse Zeeman background correction method for air mercury measurement 2014 Chin. Phys. B 23 107104


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Transverse Zeeman background correction method for air mercury measurement

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