Application of a cw quantum cascade laser CO2 analyser to catalytic oxidation reaction monitoring

Kasyutich, Vasili L.; Poulidi, Danai; Jalil, Mas Rahayu; Metcalfe, Ian S.; Martin, Philip A.

doi:10.1007/s00340-012-5154-y

Cited by 3 publications

(1 citation statement)

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“…8(d) corresponds to a CO 2 detection limit of 7 ppbv. As a comparison, in some recent studies, the reported detection limits of CO 2 are 40 ppbv by a laser absorption spectrometer based on a tunable quantum cascade laser operating at 4.3 μm [44], and 9 ppbv by a chromatographic method [45]. The spectrometer presented here has a high sensitivity, is relatively simple, and does not require cryogenic cooling for either lasers or detectors.…”

Section: Sensitivity and The Detection Limitmentioning

confidence: 77%

Ultrasensitive, self-calibrated cavity ring-down spectrometer for quantitative trace gas analysis

et al. 2014

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A cavity ring-down spectrometer is built for trace gas detection using telecom distributed feedback (DFB) diode lasers. The longitudinal modes of the ring-down cavity are used as frequency markers without active-locking either the laser or the high-finesse cavity. A control scheme is applied to scan the DFB laser frequency, matching the cavity modes one by one in sequence and resulting in a correct index at each recorded spectral data point, which allows us to calibrate the spectrum with a relative frequency precision of 0.06 MHz. Besides the frequency precision of the spectrometer, a sensitivity (noise-equivalent absorption) of 4×10^-11 cm^-1 Hz^-1/2 has also been demonstrated. A minimum detectable absorption coefficient of 5×10^-12 cm^-1 has been obtained by averaging about 100 spectra recorded in 2 h. The quantitative accuracy is tested by measuring the CO₂ concentrations in N₂ samples prepared by the gravimetric method, and the relative deviation is less than 0.3%. The trace detection capability is demonstrated by detecting CO₂ of ppbv-level concentrations in a high-purity nitrogen gas sample. Simple structure, high sensitivity, and good accuracy make the instrument very suitable for quantitative trace gas analysis.

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Section: Sensitivity and The Detection Limitmentioning

confidence: 77%

Ultrasensitive, self-calibrated cavity ring-down spectrometer for quantitative trace gas analysis

et al. 2014

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Fundamentals of spectral detection

Werle

2014

Laser Spectroscopy for Sensing

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Optimization Design of Laser Arrays Based on Absorption Spectroscopy Imaging for Detecting Temperature and Concentration Fields

Fan,

Dong,

Duan

et al. 2024

Materials

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Detecting temperature and concentration fields within engine combustors holds paramount significance in enhancing combustion efficiency and ensuring operational safety. Within the realm of engine combustors, the laminar absorption spectroscopy technique has garnered considerable attention. Particularly crucial is the optimization of the optical path configuration to enhance the efficacy of reconstruction. This study presents a flame parameter field reconstruction model founded on laminar absorption spectroscopy. Furthermore, an optimization approach for refining the optical path configuration is delineated. In addressing non-axisymmetric flames, the simulated annealing algorithm (SA) and Harris’s Hawk algorithm (HHO) are employed to optimize the optical path layout across varying beam quantities. The findings underscore a marked reduction in imaging errors with the optimized optical path configuration compared to conventional setups, thereby elevating detection precision. Notably, the HHO algorithm demonstrates superior performance over the SA algorithm in terms of optimization outcomes and computational efficiency. Compared with the parallel optical path, the optimized optical path of the HHO algorithm reduces the temperature field error by 25.5% and the concentration field error by 26.5%.

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Application of a cw quantum cascade laser CO2 analyser to catalytic oxidation reaction monitoring

Abstract: IS, Martin PA. Application of a cw quantum cascade laser CO 2 analyser to catalytic oxidation reaction monitoring. Applied Physics B 2013, 110(2), 263-269.

Cited by 3 publications

References 19 publications

Ultrasensitive, self-calibrated cavity ring-down spectrometer for quantitative trace gas analysis

Ultrasensitive, self-calibrated cavity ring-down spectrometer for quantitative trace gas analysis

Fundamentals of spectral detection

Optimization Design of Laser Arrays Based on Absorption Spectroscopy Imaging for Detecting Temperature and Concentration Fields

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