Abstract

An a posteriori corrective method based on photo-acoustic cell (PAC) information is proposed to correct for laser transmitter spectral shift during atmospheric CO₂ measurements by 2 μm heterodyne differential absorption lidar (HDIAL) technique. The method for using the PAC signal to retrieve the actual atmospheric CO₂ absorption is presented in detail. This issue is tackled using a weighting function. The performance of the proposed corrective method is discussed and the various sources of error associated with the PAC signal are investigated. For 300 shots averaged and a frequency shift (from the CO₂ absorption line center) lower than the CO₂ absorption line half-width, the relative error on HDIAL CO₂ mixing ratio measurements is lower than 1.3%. The corrective method is validated in absolute value by comparison between HDIAL and <i>in situ</i> sensor measurements of CO₂.

Two-micrometer heterodyne differential absorption lidar measurements of the atmospheric CO₂ mixing ratio in the boundary layer

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Side-line tunable laser transmitter for differential absorption lidar measurements of CO₂: design and application to atmospheric measurements

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Appl. Opt. 43(26) 5092-5099 (2004)

Simulations of a multi-wavelength differential absorption lidar method for CO₂ measurement

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Appl. Opt. 56(30) 8532-8540 (2017)

Double-pulse 2-μm integrated path differential absorption lidar airborne validation for atmospheric carbon dioxide measurement

Tamer F. Refaat, Upendra N. Singh, Jirong Yu, Mulugeta Petros, Ruben Remus, and Syed Ismail
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