Benchmarking Precompensated Current-Modulated Diode-Laser-Based Differential Absorption Lidar for CO₂ Gas Concentration Measurements at kHz Rate.

ABSTRACT: We present a tunable diode-laser absorption spectroscopy (TDLAS) system operating at 1.5711 µm for CO₂ gas concentration measurements. The system can operate in either a traditional direct-mode (dTDLAS) sawtooth wavelength scan or a recently demonstrated wavelength-toggled single laser differential-absorption lidar (WTSL-DIAL) mode using precompensated current pulses. The use of such precompensated pulses offsets the slow thermal constants of the diode laser, leading to fast toggling between ON and OFF-resonance wavelengths. A short measurement time is indeed pivotal for atmospheric sensing, where ambient factors, such as turbulence or mechanical vibrations, would otherwise deteriorate sensitivity, precision and accuracy. Having a system able to operate in both modes allows us t

SUBMITTER: Zanetti G 

PROVIDER: S-EPMC12526940 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature