Single-wavelength lidar retrieval algorithm of particulate matter concentration using CELiS (compact eyesafe lidar system) a 1.5 μm elastic lidar system

Alan W. Bird; Kori D. Moore; Michael Wojcik; Robert Lemon

doi:10.1117/12.2177049

19 May 2015 Single-wavelength lidar retrieval algorithm of particulate matter concentration using CELiS (Compact Eyesafe Lidar System) a 1.5 μm elastic lidar system

Alan W. Bird, Kori D. Moore, Michael Wojcik, Robert Lemon

Author Affiliations +

Proceedings Volume 9455, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI; 94550E (2015) https://doi.org/10.1117/12.2177049
Event: SPIE Defense + Security, 2015, Baltimore, MD, United States

Abstract

CELiS (Compact Eyesafe Lidar System) is an elastic backscatter light detection and ranging (lidar) system developed for monitoring air quality environmental compliance regarding particulate matter (PM_k) generated from off-road use of wheeled and tracked vehicles as part of the SERDP (Strategic Environmental Research and Development Program) Measurement and Modeling of Fugitive Dust Emission from Off-Road DoD Activities program. CELiS is small, lightweight and easily transportable for quick setup and measurement of PM_k concentration and emissions. CELiS operates in a biaxial configuration at the 1.5μm eyesafe wavelength with a working range of better than 6 km and range resolution of 5 m. In this paper, we describe an algorithm that allows for semi-quantitative PM_k determination under a set of guiding assumptions using a single wavelength lidar. Meteorological and particle measurements are used to estimate the total extinction (α) and backscatter (β) at a calibration point located at the end range of the lidar. These α and β values are used in conjunction with the Klett inversion to estimate α and β over the lidar beam path. A relationship between β, α and PM_k mass concentrations at calibration points is developed, which then allows the β and α values derived to be converted to PM_k at each lidar bin over the lidar beam path. CELiS can be used to investigate PM_k concentrations and emissions over a large volume, a task that is very difficult to accomplish with typical PM_k sensors.

Citation Download Citation

Alan W. Bird, Kori D. Moore, Michael Wojcik, and Robert Lemon "Single-wavelength lidar retrieval algorithm of particulate matter concentration using CELiS (Compact Eyesafe Lidar System) a 1.5 μm elastic lidar system", Proc. SPIE 9455, Chemical, Biological, Radiological, Nuclear, and Explosives (CBRNE) Sensing XVI, 94550E (19 May 2015); https://doi.org/10.1117/12.2177049

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KEYWORDS

LIDAR

Backscatter

Atmospheric particles

Calibration

Aerosols

Phase modulation

Atmospheric modeling

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