Mr. Wang Junbo Profile

Wang Junbo

at Tsinghua University

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Proceedings Article | 8 October 2015 Paper

Multi-pass gas cell designed for VOCs analysis by infrared spectroscopy system

Junbo Wang, Xin Wang, Haoyun Wei

Proceedings Volume 9677, 967718 (2015) https://doi.org/10.1117/12.2199621

KEYWORDS: Mirrors, Infrared spectroscopy, Monochromatic aberrations, Chemical analysis, Aberration theory, Finite element methods, Spherical lenses, Infrared radiation, Spectroscopy, Absorption

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Volatile Organic Compounds (VOCs) emitted from chemical, petrochemical, and other industries are the most common air pollutants leading to various environmental hazards. Regulations to control the VOCs emissions have been more and more important in China, which requires specific VOCs measurement systems to take measures. Multi-components analysis system, with an infrared spectrometer, a gas handling module and a multi-pass gas cell, is one of the most effective air pollution monitoring facilities. In the VOCs analysis system, the optical multi-pass cell is required to heat to higher than 150 degree Celsius to prevent the condensation of the component gas. Besides that, the gas cell needs to be designed to have an optical path length that matches the detection sensitivity requirement with a compact geometry. In this article, a multi-pass White cell was designed for the high temperature absorption measurements in a specified geometry requirement. The Aberration theory is used to establish the model to accurately calculate the astigmatism for the reflector system. In consideration of getting the optimum output energy, the dimensions of cell geometry, object mirrors and field mirror are optimized by the ray-tracing visible simulation. Then finite element analysis was used to calculate the thermal analysis for the structure of the external and internal elements for high stability. According to the simulation, the cell designed in this paper has an optical path length of 10 meters with an internal volume of 3 liters, and has good stability between room temperature to 227 degree Celsius.

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