Quantum Cascade Laser Spectroscopy

Pal, Mithun; Pradhan, Manik

doi:10.1007/978-981-33-6084-6_14

Cited by 5 publications

(1 citation statement)

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“…These advantages, and many more, make laser spectroscopy a highly efficient technique for measuring trace gases compared to classic chemical and chromatographic measurement techniques (Li et al, 2013). Tunable Diode Laser Absorption Spectroscopy (TDLAS) and the more efficient Quantum cascade Laser infrared Absorption Spectroscopy (QLAS) have been proven to be reliable measurement tech-niques in numerous publications (Faist et al (1994); Kormann et al (2002); Fried and Richter (2006); McManus et al (2010); Tuzson et al (2020); Pal and Pradhan (2021) and citations within). Especially for airborne measurements, a lightweight and compact design that can withstand the extremely difficult measurement conditions caused by abrupt changes in acceleration, direction and height is very important (Richter et al (2015); Catoire et al (2017)).…”

Section: Introductionmentioning

confidence: 99%

In-flight characterization of a compact airborne quantum cascade laser absorption spectrometer

Ort,

Röder,

Parchatka

et al. 2023

Preprint

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Abstract. Here, we report the development of a new Quantum cascade Laser infrared Absorption Spectroscopy (QLAS) instrument, the Airborne Tropospheric Tracer In-situ Laser Absorption spectrometer (ATTILA), for atmospheric trace gas measurements on board of the German High-Altitude Long-range Observatory (HALO) aircraft. Its small and light design makes it suitable for airborne measurements up to approximately 150 hPa of ambient pressure (13–14 km). The dual laser instrument can measure several trace gases simultaneously in two 36.4-m-path astigmatic Herriott cells with a data acquisition frequency of 1 Hz. We describe the measurement method and the data acquisition of ATTILA and its in-flight performance by focusing on potential sources of influences on the signal, which we investigated with a dedicated test flight during which the instrument sampled from a constant source. We show that linear critical influences associated with challenging movement patterns can be corrected afterwards, while non-linear limitations can be minimized by appropriate calibration frequencies and integrated time intervals. During the recent aircraft campaign CAFE-Brazil (Chemistry of the Atmosphere Field Experiment in Brazil) from December 2022 to January 2023, carbon monoxide (CO) measurements from ATTILA show a good agreement of a R2 of 0.89 with simultaneous CO measurements from an established IR spectrometer for airborne measurements, the TRacer In-Situ Tdlas for Atmospheric Research (TRISTAR), on a 10 s time resolution. First dynamical characteristics and tracer distributions of CO and methane (CH4) over the Amazon rainforest can be identified with ATTILA measurements with a total measurement uncertainty of 10.1 % and 17.5 % and a data accuracy of 0.3 % and 5.5 % for a data acquisition frequency of 1 Hz for CO and CH4, respectively.

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