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Zhu W, Liu Q, Wu Y. Aerosol absorption measurement at SWIR with water vapor interference using a differential photoacoustic spectrometer. Opt Express. 2015;23(18):23108-16doi: 10.1364/OE.23.023108.
Zhu, W., Liu, Q., & Wu, Y. (2015). Aerosol absorption measurement at SWIR with water vapor interference using a differential photoacoustic spectrometer. Optics express, 23(18), 23108-16. https://doi.org/10.1364/OE.23.023108
Zhu, Wenyue, et al. "Aerosol absorption measurement at SWIR with water vapor interference using a differential photoacoustic spectrometer." Optics express vol. 23,18 (2015): 23108-16. doi: https://doi.org/10.1364/OE.23.023108
Zhu W, Liu Q, Wu Y. Aerosol absorption measurement at SWIR with water vapor interference using a differential photoacoustic spectrometer. Opt Express. 2015 Sep 07;23(18):23108-16. doi: 10.1364/OE.23.023108. PMID: 26368414.
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Opt Express. 2015 Sep 07;23(18):23108-16. doi: 10.1364/OE.23.023108.

Aerosol absorption measurement at SWIR with water vapor interference using a differential photoacoustic spectrometer.

Optics express

Wenyue Zhu, Qiang Liu, Yi Wu

PMID: 26368414 DOI: 10.1364/OE.23.023108

Abstract

Atmospheric aerosol plays an important role in atmospheric radiation balance through absorbing and scattering the solar radiation, which changes local weather and global climate. Accurate measurement is highly requested to estimate the radiative effects and climate effects of atmospheric aerosol. Photoacoustic spectroscopy (PAS) technique, which observes the aerosols on their natural suspended state and is insensitive to light scattering, is commonly recognized as one of the best candidates to measure the optical absorption coefficient (OAC) of aerosols. In the present work, a method of measuring aerosol OAC at the wavelength where could also be absorbed by water vapor was proposed and corresponding measurements of the absorption properties of the atmospheric aerosol at the short wave infrared (SWIR, 1342 nm) wavelength were carried out. The spectrometer was made up of two high performance homemade photoacoustic cells. To improve the sensitivity, several methods were presented to control the noise derived from gas flow and vibration from the sampling pump. Calibration of the OAC and properties of the system were also studied in detail. Using the established PAS instrument, measurement of the optical absorption properties of the atmospheric aerosol were carried out in laboratory and field environment.

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