Active standoff mixing-ratio measurements of N2O from topographic targets using an open-path quantum cascade laser system

Roman Basistyy; Adrien Genoud; Adrian Diaz; Fred Moshary; Benjamin Thomas

doi:10.1117/12.2323548

24 October 2018 Active standoff mixing-ratio measurements of N₂O from topographic targets using an open-path quantum cascade laser system

Roman Basistyy, Adrien Genoud, Adrian Diaz, Fred Moshary, Benjamin Thomas

Author Affiliations +

Proceedings Volume 10779, Lidar Remote Sensing for Environmental Monitoring XVI; 107790G (2018) https://doi.org/10.1117/12.2323548
Event: SPIE Asia-Pacific Remote Sensing, 2018, Honolulu, Hawaii, United States

Abstract

Active stand-off detection and hard-target lidars are common methodologies for gas identification, chemical emission tracing, hazardous material sensing, or explosive detection to name a few. By their nature, this type of instrument heavily relies on the reflectivity or backscattering properties of distant targets. While some applications allow the use of retroreflectors, most mobile systems require the use of actual topographic targets, such as the ground, roads, buildings, roofs, or vegetation. In this work, N₂O path-averaged mixing ratios are measured with the 10 Hz frequency using a quantum cascade laser open path system operating at 7.7 μm wavelength. Measurements are performed by detecting the light backscattered from common topographic targets located 5.5 m away from the instrument. For each topographic target, the detection limit and accuracy of the retrieved mixing ratios are presented and discussed showing detection limits between 0.008 and 1.36 ppm depending on the target and mixing ratio relative errors between 4 and 80 %.

Citation Download Citation

Roman Basistyy, Adrien Genoud, Adrian Diaz, Fred Moshary, and Benjamin Thomas "Active standoff mixing-ratio measurements of N₂O from topographic targets using an open-path quantum cascade laser system", Proc. SPIE 10779, Lidar Remote Sensing for Environmental Monitoring XVI, 107790G (24 October 2018); https://doi.org/10.1117/12.2323548

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KEYWORDS

Target detection

Backscatter

Quantum cascade lasers

Signal to noise ratio

Absorbance

Absorption

Ceramics

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