External cavity widely tunable quantum cascade laser based hollow waveguide gas sensors for multianalyte detection

Young, Christina; Kim, S.-S.; Luzinova, Yuliya; Weida, Miles J.; Arnone, David; Takeuchi, Eric B.; Day, Timothy; Mizaikoff, Boris

doi:10.1016/j.snb.2009.03.023

Cited by 64 publications

(48 citation statements)

References 20 publications

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“…In this configuration, continuous tuning over 250 cm −1 has been achieved [50]. Young et al [51] have constructed a gas sensing module comprising an EC-QCL and a hollow-core waveguide, thereby achieving multianalyte sensing with excellent sensitivity. It was possible to achieve LODs as low as 4 ppb for ethyl chloride, 7 ppm for dichloromethane, and 11 ppb for trichloromethane by precisely tuning the lasing wavelength of EC-QCL to the Q-branch of each analyte absorption peak.…”

Section: Mid-infrared Optical Sensorsmentioning

confidence: 99%

Miniaturized Optical Sensors for Medical Diagnostics

Kim

Mizaikoff

2014

Handbook of Spectroscopy

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Section: Mid-infrared Optical Sensorsmentioning

confidence: 99%

Miniaturized Optical Sensors for Medical Diagnostics

Kim

Mizaikoff

2014

Handbook of Spectroscopy

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“…To improve sensitivity of absorption spectral measurement, combinations of hollow-waveguide gas cells and QCLs have also been reported. 8,9 By using theoretical simulations, we carefully optimized the configurations of hollow optical fibers, such as the fiber's length and diameter, to improve the signal-to-noise ratio (SNR) of the measurement with FTIR. As far as we know, this is the first trial to theoretically optimize hollowwaveguide-based gas cells.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of hollow-optical-fiber gas cell for infrared spectroscopy

et al. 2013

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Abstract. We optimized the configuration of a hollow-fiber gas cell used in a Fourier-transform infrared spectroscopy system for quantitative analyses of low-concentration gas components with small sample volume. Numerical calculation shows that the signal-to-noise ratio (SNR) of this measurement system is maximized in a condition dependent on a fiber's bore size and length, transmission loss of the fiber, and absorption coefficient of the objective gas component. From the design calculation, a hollow optical fiber with a large diameter of 2 mm was chosen, and a measurement system was constructed with the fiber. In analyses of measured absorption spectra, evaluation of the total area of multiple peaks with different rotation levels enables precise evaluation of gas components with high SNR. Experimental results with sample gases containing nitric oxide showed that a minimum detection limit <1 ppm is obtained owing to gas-cell optimization and numerical procedures. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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“…Since its advent, quantum cascade laser (QCL) has been successfully used for absorption spectroscopy by various researchers [1][2][3][4][5][6][7][8][9] for fast and sensitive measurements. Some of the studies successfully achieved even ppbv levels of measurement accuracy [8,9] for trace components in gas mixtures.…”

Section: Introductionmentioning

confidence: 99%