Use of the Long-Wavelength Range for Remote Sensing of Atmospheric Aerosols
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TICAL INSTRUMENTATION
Use of the Long-Wavelength Range for Remote Sensing of Atmospheric Aerosols A. V. Klimkina, *, A. A. Karapuzikovb, G. P. Kokhanenkoa, A. N. Kuryaka, K. Yu. Osipova, Yu. N. Ponomareva, and Shuo Zhanga aV.E.
Zuev Institute of Atmospheric Optics, Siberian Branch, Russian Academy of Sciences, Tomsk, 634055 Russia b Special Technologies LLC, Novosibirsk, 630060 Russia *e-mail: [email protected] Received January 16, 2020; revised January 16, 2020; accepted January 28, 2020
Abstract—The results of laboratory experiments on recording the backscattered IR laser radiation from aerosol particles which contain organic impurities are presented. The studies were performed at the laboratory test bench according to the lidar sensing scheme along a controlled optical path. Water aerosol and water solutions with organic impurities (tryptophan, isopropyl alcohol, glycerin, and nicotinamide adenine dinucleotide (NADH)) were used as model media. A possibility of using IR lasers with frequency scanning for remote sensing of atmospheric organic aerosols is shown. Keywords: laboratory simulation, CO2 laser, long-wave lidar, remote sensing DOI: 10.1134/S1024856020040065
INTRODUCTION Control and monitoring of atmospheric aerosols which contain organic compounds of natural and anthropogenic origin is important for assessing their danger to human health and plant and animal biosystems. The scale and dynamics of aerosol fields in the atmosphere determine the development of fast methods for remote optical sensing of atmospheric aerosol with the use of different laser types [1]. The advantage of active laser sensing is that laser radiation is characterized by high energy and short pulse duration, low angular divergence, and a wide spectral range of lasing waves (from UV to far-IR). Laser locators (lidars) are the most promising for monitoring the characteristics of aerosol formations including the real-time estimation of the size and composition of aerosol particles [2–7]. Lidars with UV lasers are currently used for sounding organic compounds in aerosols of natural and anthropogenic origin; they allow remote excitation of fluorescence and Raman spectra and their subsequent analysis [8–10]. The disadvantage of these lidars is the difficulty of using them in the daytime due to the strong background of solar radiation. In addition, UV radiation is strongly attenuated in the atmosphere (aerosol scattering, ozone absorption bands), which significantly limits the range of lidars. Therefore, researchers drew attention to possibilities of sensing organic compounds in aerosols with backscattered signals of a wavelength-tuned pulsed IR laser [11–13]. In the long-wave IR, the solar illumination effect is negligible, like the radiation attenuation in the atmo-
sphere, which increases the range of lidars and makes it possible to work at any time of the day. In a series of laboratory experiments [14], a possibility of detecting organic compounds in aerosol at 19 wavelengths from the 9.23–10.696-μm range is shown and the results of compari
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