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Proceedings Paper

Study on the elemental mercury absorption cross section based on differential optical absorption spectroscopy
Author(s): Haiming Zheng; Penghui Yao
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Paper 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.

Paper Details

Date Published: 22 August 2015
PDF: 10 pages
Proc. SPIE 9656, International Symposium on Photonics and Optoelectronics 2015, 96560N (22 August 2015); doi: 10.1117/12.2197229
Show Author Affiliations
Haiming Zheng, North China Electric Power Univ. (China)
Penghui Yao, North China Electric Power Univ. (China)

Published in SPIE Proceedings Vol. 9656:
International Symposium on Photonics and Optoelectronics 2015
Zhiping Zhou, Editor(s)

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