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Optical Engineering

Differential absorption lidar system for simultaneous measurement of O3and NO2: system development and measurement error estimation
Author(s): Tetsuo Fukuchi; Takuya Nayuki; Nianwen Cao; Takashi Fujii; Koshichi Nemoto; Hideto Mori; Nobuo Takeuchi
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Paper Abstract

A differential absorption lidar system for simultaneous measurement of O3 and NO2 in the lower troposphere is developed. The system is based on a pair of Nd:YAG pumped dye lasers each capable of emitting two wavelengths on alternate pulses. Sum frequency generation is used to generate laser pulses of wavelengths 446.8 and 448.1 nm used for NO2 measurement. O3 concentrations of approximately 30 to 60 ppb and NO2 concentrations of approximately 4 to 45 ppb are obtained for a vertical range of 1000 to 1500 m. Changes in O3 and NO2 concentration over a time interval of a few hours suggests an anticorrelation between these quantities. The measurement error, estimated from statistical error and instrumental error, is 2.5 ppb for O3 concentration and 5.5 ppb for NO2 concentration. In the case of NO2 measurement, the error due to differential backscatter gradient is found to be a major source of error, but does not fully account for the measurement error.

Paper Details

Date Published: 1 January 2003
PDF: 7 pages
Opt. Eng. 42(1) doi: 10.1117/1.1525274
Published in: Optical Engineering Volume 42, Issue 1
Show Author Affiliations
Tetsuo Fukuchi, Central Research Institute of Electric Power Industry (Japan)
Takuya Nayuki, Central Research Institute of Electric Power Industry (Japan)
Nianwen Cao, Central Research Institute of Electric Power Industry (Japan)
Takashi Fujii, Central Research Institute of Electric Power Industry (Japan)
Koshichi Nemoto, Central Research Institute of Electric Power Industry (Japan)
Hideto Mori, Tokyo Institute of Technology (Japan)
Nobuo Takeuchi, Chiba Univ. (Japan)


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