FILTER-FREE LIGHT ABSORPTION MEASUREMENT OF VOLCANIC ASHES AND AMBIENT PARTICULATE MATTER USING MULTI-WAVELENGTH PHOTOACOUSTIC SPECTROSCOPY

Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium Pub Date : 2019-01-01 DOI:10.2528/pier19100603

Gaoxuan Wang, P. Kulinski, P. Hubert, A. Deguine, D. Petitprez, S. Crumeyrolle, E. Fertein, K. Deboudt, P. Flament, M. Sigrist, H. Yi, Weidong Chen

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引用次数: 7

Abstract

Accurate measurement of atmospheric particulate matter (PM) absorption coefficient is highly required for study of earth climate change and for monitoring of air quality. In addition, multiwavelength measurements of PM absorption can provide information on the PM chemical composition (black carbon or brown carbon). A multi-wavelengths photoacoustic (MW-PA) spectrophone operating at 444, 532 and 660 nm was developed and deployed for filter-free characterization of wavelengthdependent optical properties of PM mass absorption coefficient (MAC) and absorption Ångström coefficient (AAC). It is worth noting that to date no any AAC of volcanic ashes determined by filter-free measurement have been reported. The developed MW-PA spectrophone was deployed to an intensive field campaign measurement of environmental PM in Grenoble (France). Side-by-side inter-comparison measurements of ambient PM showed a good correlation between the developed MW-PA spectrophone and a reference instrument aethalometer (Magee scientific, AE33).

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用多波长光声光谱法测量火山灰和周围颗粒物的无滤光吸收

大气颗粒物(PM)吸收系数的精确测量是研究地球气候变化和监测空气质量的重要手段。此外，对PM吸收的多波长测量可以提供PM化学成分(黑碳或棕色碳)的信息。研制了一种工作波长为444、532和660 nm的多波长光声(MW-PA)光谱仪，用于无滤波器表征PM质量吸收系数(MAC)和吸收Ångström系数(AAC)的波长相关光学特性。值得注意的是，迄今为止还没有任何通过无过滤器测量确定的火山灰AAC的报告。在法国格勒诺布尔进行了环境PM的密集野外测量。环境PM的并排相互比较测量表明，开发的MW-PA光谱仪与参考仪器酒精计之间具有良好的相关性(Magee scientific, AE33)。

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Progress in Electromagnetics Research Symposium : [proceedings]. Progress in Electromagnetics Research Symposium

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