Calibration of a multi-pass photoacoustic spectrometer cell using light-absorbing aerosols
Calibration of a multi-pass photoacoustic spectrometer cell using light-absorbing aerosols
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DOI：
10.5194/amt-10-1203-2017
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发表时间：
2017-03-29
影响因子：
3.8
通讯作者：
Rudich, Yinon
中科院分区：
文献类型：
--
作者：
Bluvshtein, Nir;Flores, J. Michel;Rudich, Yinon
多通光声光谱仪（PAS）是直接测量大气气溶胶光吸收的重要工具。精确的PAS测量在很大程度上依赖于对其信号的精确校准。臭氧通常用于校准PAS仪器，通过将光声信号与独立方法测量的吸收系数相关联，如腔衰荡光谱（CRD-S），腔增强光谱（CES）或臭氧监测仪。我们在这里报告了一种校准方法，该方法使用测量的雾化吸收光的有机材料的吸收系数，并提供了一种在404 nm校准光声气溶胶光谱仪的替代方法。为了实现这一方法，我们首先使用光谱椭偏法测定了有机染料黑素的复折射率，然后将这种表征良好的材料作为PAS校准的标准材料。
The multi-pass photoacoustic spectrometer (PAS) is an important tool for the direct measurement of light absorption by atmospheric aerosol. Accurate PAS measurements heavily rely on accurate calibration of their signal. Ozone is often used for calibrating PAS instruments by relating the photoacoustic signal to the absorption coefficient measured by an independent method such as cavity ring down spectroscopy (CRD-S), cavity-enhanced spectroscopy (CES) or an ozone monitor. We report here a calibration method that uses measured absorption coefficients of aerosolized, light-absorbing organic materials and offer an alternative approach to calibrate photoacoustic aerosol spectrometers at 404 nm. To implement this method, we first determined the complex refractive index of nigrosin, an organic dye, using spectroscopic ellipsometry and then used this well-characterized material as a standard material for PAS calibration.