Study on the elemental mercury absorption cross section based on differential optical absorption spectroscopy

Haiming Zheng; Penghui Yao

doi:10.1117/12.2197229

22 August 2015 Study on the elemental mercury absorption cross section based on differential optical absorption spectroscopy

Haiming Zheng, Penghui Yao

Author Affiliations +

Proceedings Volume 9656, International Symposium on Photonics and Optoelectronics 2015; 96560N (2015) https://doi.org/10.1117/12.2197229
Event: International Symposium on Photonics and Optics, 2015, Shanghai, China

Abstract

With the method of ultraviolet absorption spectrum, the exact absorption cross-section with the light source of the low-pressure mercury lamp was determined, during which the optimum wavelength for mercury concentrations inversion was 253.69 nm, the highest detection limit was 0.177 μg/cm³, and the lowest detection limit was 0.034 μg/cm³. Furthermore, based on the differential optical absorption spectroscopy(DOAS), the relationship between the integral parameters (IP) and the concentration as well as the signal-noise ration (SNR) under the conditions of gas flow was determined and the lowest detection limit was figured out to be 0.03524 μg/cm³, providing a method of DOAS to de-noise through the comparison between the mercury concentration values produced by DOAS and that produced by the wavelet de-noising method (db5). It turned out that the differential optical absorption spectroscopy had a strong anti-interference ability, while the wavelet de-noising method was not suitable for measuring the trace concentration change.

Citation Download Citation

Haiming Zheng and Penghui Yao "Study on the elemental mercury absorption cross section based on differential optical absorption spectroscopy", Proc. SPIE 9656, International Symposium on Photonics and Optoelectronics 2015, 96560N (22 August 2015); https://doi.org/10.1117/12.2197229

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