Measurement of CO amount fractions using a pulsed quantum-cascade laser operated in the intrapulse mode

Nwaboh, Javis A.; Werhahn, Olav; Schiel, Detlef

doi:10.1007/s00340-010-4322-1

Cited by 20 publications

(25 citation statements)

References 45 publications

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“…The experimental setup similar to the one presented earlier [14] is shown in figure 1. For this work, a continuous wave (cw), thermoelectrically cooled, distributed-feedback (DFB) tunable diode laser (TDL) emitting around 4987.3 cm −1 (for 2004 nm commercially available from Nanoplus GmbH) was used as the laser source.…”

Section: Methodsmentioning

confidence: 99%

“…For the data presented in this paper, the used A/D card was at 8-bit vertical resolution, attributed to the fact that, actually, it could have been used at high-speed 5 GS s −1 to enable high-speed pulsed laser experiments with the same spectrometer setup as well [14].…”

Section: Methodsmentioning

confidence: 99%

“…During the last decade different laser spectroscopic techniques, such as tunable diode laser absorption spectroscopy (TDLAS) and cavity ring-down spectroscopy (CRDS), have been extensively used to measure the amount fraction of different gas species [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16]. Each technique has its own merits, consequently their choice depends on the individual field of application [12,17].…”

Section: Introductionmentioning

confidence: 99%

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Laser-spectrometric gas analysis: CO₂–TDLAS at 2 µm

Nwaboh

Werhahn

Ortwein

et al. 2012

Meas. Sci. Technol.

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View the article online for updates and enhancements. Related contentMetrological quantification of CO in biogas using laser absorption spectroscopy and gas chromatography Javis A Nwaboh, Stefan Persijn, Karine Arrhenius et al. Abstract Employing direct absorption spectroscopy and using a spectrometer comprising a single-pass and a multipass white cell, we probed the R(12) line of carbon dioxide (CO 2 ) in the combination band around 2 μm. Gravimetric gas standards containing CO 2 , between 300 and 60 000 μmol mol −1 (0.03% to 6%), in N 2 were quantified by means of the TILSAM method. The spectrometric results were compared with the gravimetric reference values. We describe our implementation of the 'Guide to the Expression of Uncertainty in Measurements' to infrared laser-spectrometric gas analysis. Data quality objectives are addressed by uncertainty and traceability flags. Uncertainty budgets are presented to show the quality of the results and to demonstrate software-assisted uncertainty assessment. The relative standard uncertainties of the spectrometrically measured CO 2 amount fractions at, e.g., ambient levels of 360 μmol mol −1 and at exhaled breath gas levels of 50 mmol mol −1 were 1.4% and 0.7%, respectively. Our detection limit was 2.2 μmol mol −1. The reproducibility of individual results was in the ±1% range. Furthermore, we measured collisional broadening coefficients of the R(12) line of CO 2 at 4987.31 cm −1 . The relative standard uncertainties of the measured self-, nitrogen-, oxygen-and air-broadening coefficients were in the ±1.7% range.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Laser-spectrometric gas analysis: CO₂–TDLAS at 2 µm

Nwaboh

Werhahn

Ortwein

et al. 2012

Meas. Sci. Technol.

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“…This method offers very good signal-to-noise capability, however, it suffers from an increasingly limited spectral modulation depth at higher frequencies, thus prohibiting the scan over complete line profiles. An alternative approach is that of the intrapulse technique [7,[9][10][11]14].…”

Section: Introductionmentioning

confidence: 99%

“…Thus far, applications of this technique to monitor molecular species (e.g. NH 3 , •CF 3 , CO, COS) comprise only a scant number of concentration measurements [7,10,12] and rapid-passage (RP) effect studies [11,13,14].…”

Section: Introductionmentioning

confidence: 99%

Towards simultaneous calibration-free and ultra-fast sensing of temperature and species in the intrapulse mode

Chrystie

Nasir

Farooq

2015

Proceedings of the Combustion Institute

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Towards simultaneous calibration-free and ultra-fast sensing of temperature and species in the intrapulse mode KAUST Repository Abstract:We report on exploiting the down-chirp phenomenon seen in quantum cascade lasers (QCLs), when modulated with long pulses, for the purpose of performing calibration-free and temporally resolved measurements. Intrapulse spectra of a native species (e.g. H 2 O), common to combustion environments, were generated near λ=7.62 µm at repetition rates as high as 3.125 MHz. Two-line absorption spectroscopy was employed to infer calibration-free temperature from the chirp-induced intrapulse spectra. In this study, such temperature measurements were limited to rates of 250 kHz due to spectral distortion at higher repetition rates. We demonstrate the ease at which accurate temperatures and H 2 O compositions can be achieved using simple and compact QCLs operated in the intrapulse mode. The sensor is also applicable to other species, and has the potential to be integrated into commercial technologies.

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An effective TDLS setup using homemade driving modules for evaluation of pulsed QCL

Zhang

et al. 2012

Appl. Phys. B

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Measurement of CO amount fractions using a pulsed quantum-cascade laser operated in the intrapulse mode

Cited by 20 publications

References 45 publications

Laser-spectrometric gas analysis: CO₂–TDLAS at 2 µm

Laser-spectrometric gas analysis: CO₂–TDLAS at 2 µm

Towards simultaneous calibration-free and ultra-fast sensing of temperature and species in the intrapulse mode

An effective TDLS setup using homemade driving modules for evaluation of pulsed QCL

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Measurement of CO amount fractions using a pulsed quantum-cascade laser operated in the intrapulse mode

Cited by 20 publications

References 45 publications

Laser-spectrometric gas analysis: CO2–TDLAS at 2 µm

Laser-spectrometric gas analysis: CO2–TDLAS at 2 µm

Towards simultaneous calibration-free and ultra-fast sensing of temperature and species in the intrapulse mode

An effective TDLS setup using homemade driving modules for evaluation of pulsed QCL

Contact Info

Product

Resources

About

Laser-spectrometric gas analysis: CO₂–TDLAS at 2 µm

Laser-spectrometric gas analysis: CO₂–TDLAS at 2 µm