DIAL calibration using external gas cells: the influence of variations in backscatter coefficient

Harold Lees Walmsley

doi:10.1117/12.205568

10 February 1995 DIAL calibration using external gas cells: the influence of variations in backscatter coefficient

Harold Lees Walmsley

Proceedings Volume 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements; (1995) https://doi.org/10.1117/12.205568
Event: Optical Sensing for Environmental and Process Monitoring, 1994, McLean, VA, United States

Abstract

The signals obtained from a differential absorption lidar (DIAL) when the beam is directed through an external gas cell have been simulated in order to evaluate the use of such cells for checking DIAL performance and calibration. A particular concern has been to examine how the backscatter coefficient of the gas in the cell would affect the measurements. The results of the simulations show that with high spatial resolution, concentration measurements are not highly sensitive to the amount or nature of the scatterer in the cell. When the spatial resolution of the DIAL is comparable to the cell dimensions or greater, the sensitivity of concentration measurements to variations in aerosol content is much greater and significant errors can occur unless there is a relatively close match between the cell and background backscatter coefficients.

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Harold Lees Walmsley "DIAL calibration using external gas cells: the influence of variations in backscatter coefficient", Proc. SPIE 2366, Optical Instrumentation for Gas Emissions Monitoring and Atmospheric Measurements, (10 February 1995); https://doi.org/10.1117/12.205568

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KEYWORDS

Backscatter

Aerosols

Spatial resolution

Atmospheric particles

Calibration

Methane

Signal attenuation

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