A method for monitoring mass concentration of black carbon particulate matter using photothermal interferometry

Li, Baosheng; Wang, Yicheng; Li, Zhengqiang

A method for monitoring mass concentration of black carbon particulate matter using photothermal interferometry

2016

Li, Baosheng | Wang, Yicheng | Li, Zhengqiang

A method for measurements of mass concentration of black carbon particulate matter (PM) is proposed based on photothermal interferometry (PTI). A folded Jamin photothermal interferometer was used with a laser irradiation of particles deposited on a filter paper. The black carbon PM deposited on the filter paper was regarded as a film while the quartz filter paper was regarded as a substrate to establish a mathematical model for measuring the mass concentration of PM using a photothermal method. The photothermal interferometry system was calibrated and used to measure the atmospheric PM concentration corresponding to different dust-treated filter paper. The measurements were compared to those obtained using β ray method and were found consistent. This method can be particularly relevant to polluted atmospheres where PM is dominated by black carbon.

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