A search for methane in the atmosphere of Mars using ground-based mid infrared heterodyne spectroscopy

Sonnabend, G.; Stupar, D.; Sornig, M.; Stangier, T.; Kostiuk, T.; Livengood, T. A.

doi:10.1016/j.jms.2013.05.009

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…Atmospheric absorption spectra of ozone (O 3 ) were recorded at 9 µm. This work was continued by other teams for Earth atmospheric studies [ 18 , 19 ] or astronomical ones [ 20 , 21 ]. DFB QCLs were also used in Reims with multipass cell in standard Tunable Diode Laser Absorption Spectroscopy (TDLAS) to demonstrate the water-vapor isotope ratio measurements in air: H 2 O 18 ⁄H 2 O 16 and HDO⁄H 2 O 16 at 6.7 µm [ 22 ]; the simultaneous measurement of nitrous oxide (N 2 O) and methane (CH 4 ) concentrations at ground level at 7.9 µm [ 23 ]; and the development of a field-deployable spectrometer using QCL technology at 4.5 μm to measure in situ N 2 O concentrations at ground level even in bad weather conditions [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Widely-Tunable Quantum Cascade-Based Sources for the Development of Optical Gas Sensors

Zéninari

Vallon

Bizet

et al. 2020

Sensors

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Spectroscopic techniques based on Distributed FeedBack (DFB) Quantum Cascade Lasers (QCL) provide good results for gas detection in the mid-infrared region in terms of sensibility and selectivity. The main limitation is the QCL relatively low tuning range (~10 cm−1) that prevents from monitoring complex species with broad absorption spectra in the infrared region or performing multi-gas sensing. To obtain a wider tuning range, the first solution presented in this paper consists of the use of a DFB QCL array. Tuning ranges from 1335 to 1387 cm−1 and from 2190 to 2220 cm−1 have been demonstrated. A more common technique that will be presented in a second part is to implement a Fabry–Perot QCL chip in an external-cavity (EC) system so that the laser could be tuned on its whole gain curve. The use of an EC system also allows to perform Intra-Cavity Laser Absorption Spectroscopy, where the gas sample is placed within the laser resonator. Moreover, a technique only using the QCL compliance voltage technique can be used to retrieve the spectrum of the gas inside the cavity, thus no detector outside the cavity is needed. Finally, a specific scheme using an EC coherent QCL array can be developed. All these widely-tunable Quantum Cascade-based sources can be used to demonstrate the development of optical gas sensors.

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