UV ozone DIAL based on a Raman cell filled with two Raman active gases

Valentin Simeonov; Benoit Lazzarotto; Gilles Larcheveque; Philippe Quaglia; Bertrand Calpini

doi:10.1117/12.364166

16 September 1999 UV ozone DIAL based on a Raman cell filled with two Raman active gases

Valentin Simeonov, Benoit Lazzarotto, Gilles Larcheveque, Philippe Quaglia, Bertrand Calpini

Proceedings Volume 3821, Environmental Sensing and Applications; (1999) https://doi.org/10.1117/12.364166
Event: Industrial Lasers and Inspection (EUROPTO Series), 1999, Munich, Germany

Abstract

A configuration of a UV ozone DIfferential Absorption Lidar (DIAL) based on a single cell filled with two Raman active gases has been developed. The cell is filled with a mixture of hydrogen and deuterium as active gases and argon as a buffer gas. The cell is pumped with the fourth harmonic of a Nd:YAG laser. The partial pressures of the gases are chosen to achieve even energy for the first Stokes of hydrogen (299 nm) and deuterium (289 nm), which are used as DIAL wavelengths. The ON and OFF beams, produced in this way, have identical spatial intensity distribution, identical temporal power profiles and the ability to probe the same air volume at the same time, which contributes to the decrease of systematic errors. Special care is taken to diminish the negative influence of the crosstalk between channels in the receiving part and the spatial nonuniformity of the receiving photosensors. Lidar measurements of tropospheric ozone concentration with vertical resolution ranging from 15 to 150 m and distances from 200 to 1200 m are performed. The results are compared with ground based punctual measurements and with DIAL measurements from a system with two Raman cells.

Citation Download Citation

Valentin Simeonov, Benoit Lazzarotto, Gilles Larcheveque, Philippe Quaglia, and Bertrand Calpini "UV ozone DIAL based on a Raman cell filled with two Raman active gases", Proc. SPIE 3821, Environmental Sensing and Applications, (16 September 1999); https://doi.org/10.1117/12.364166

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