Combining VIS and MIR lidars to separate aerosol modes in the troposphere

Chuen Meei Gan; Paul Corrigan; Barry Gross; YongHua Wu; Fred Moshary

doi:10.1117/12.849697

24 April 2010 Combining VIS and MIR lidars to separate aerosol modes in the troposphere

Chuen Meei Gan, Paul Corrigan, Barry Gross, YongHua Wu, Fred Moshary

Proceedings Volume 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII; 76730T (2010) https://doi.org/10.1117/12.849697
Event: SPIE Defense, Security, and Sensing, 2010, Orlando, Florida, United States

Abstract

Indentifying and quantifying ambient aerosols are important for air-quality applications. Unlike trace gases where chemical spectral signatures are sharp and well defined, aerosol spectral signatures are broader and highly overlapping. Therefore separation of aerosols into different size classes requires very broad spectral coverage from the visible (VIS) to mid-infrared (MIR). In this paper, we investigate the feasibility in using a VIS (0.65μm) diode laser combined with a suitable pulsed high power Quantum Cascade Laser (4.6μm) to obtain backscatter measurements that can be used to isolate fine and coarse mode aerosol fractions. Based on realistic source characteristics, we study the information content in the spectral extinction using different combinations of extinction measurements using Least Squares Minimization applied to a wide range of aerosol multimode mixtures obtained using realistic models obtained from the Optical Properties of Aerosol and Clouds (OPAC) model. This model is especially convenient since the optical spectral extinction and backscatter spectra are evaluated over a wide wavelength range from 250nm to 40μm. In particular, we find that with the latest QCL systems, it is possible to achieve signal to noise ratio (SNR) values ~10 with suitable temporal and spatial averaging for aerosol layers ~1.5km making it suitable for PBL layer studies.

Citation Download Citation

Chuen Meei Gan, Paul Corrigan, Barry Gross, YongHua Wu, and Fred Moshary "Combining VIS and MIR lidars to separate aerosol modes in the troposphere", Proc. SPIE 7673, Advanced Environmental, Chemical, and Biological Sensing Technologies VII, 76730T (24 April 2010); https://doi.org/10.1117/12.849697

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KEYWORDS

Signal to noise ratio

Aerosols

Backscatter

LIDAR

Calibration

Sensors

Quantum cascade lasers

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