Atmospheric CH_4 and N_2O measurements near Greater Houston area landfills using a QCL-based QEPAS sensor system during DISCOVER-AQ 2013

Jahjah, Mohammad; Jiang, Wenzhe; Sanchez, Nancy P.; Ren, Wei; Patimisco, Pietro; Spagnolo, Vincenzo; Herndon, S. C.; Griffin, Robert J.; Tittel, Frank K.

doi:10.1364/ol.39.000957

Cited by 64 publications

(31 citation statements)

References 21 publications

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“…Therefore, QCL-based gas sensor systems [17] are widely used for high sensitivity and selectivity trace gas detection in a variety of applications including environmental monitoring [18][19][20] and medical diagnostics [21,22]. A CW DFB-QCL (Corning Inc., New York) with a wavelength of ~7.73 µm was used as an excitation source to target the absorption lines near 1297 cm −1 for simultaneous multiple species gas detection.…”

Section: Characterization Of Qcl Based Tdlas Excitation Sourcementioning

confidence: 99%

Simultaneous atmospheric nitrous oxide, methane and water vapor detection with a single continuous wave quantum cascade laser

et al. 2015

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, and H 2 O at 1297.184 cm −1 . An astigmatic multipass Herriott cell with a 76-m path length was utilized for laser based gas absorption spectroscopy at an optimum pressure of 100 Torr. Wavelength modulation and second harmonic detection was employed for data processing. Minimum detection limits (MDLs) of 1.7 ppb for N 2 O, 8.5 ppb for CH 4 , and 11 ppm for H 2 O were achieved with a 2-s integration time for individual gas detection. This single QCL based multi-gas detection system possesses applications in environmental monitoring and breath analysis.

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Section: Characterization Of Qcl Based Tdlas Excitation Sourcementioning

confidence: 99%

Simultaneous atmospheric nitrous oxide, methane and water vapor detection with a single continuous wave quantum cascade laser

et al. 2015

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“…Successful application for atmospheric CH 4 and N 2 O measurements near Greater Huston area landfills using QCL-based QEPAS sensor was reported in 2014 [25].…”

Section: Introductionmentioning

confidence: 99%

Off-beam quartz-enhanced photoacoustic spectroscopy-based sensor for hydrogen sulfide trace gas detection using a mode-hop-free external cavity quantum cascade laser

et al. 2017

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recommended by the European Agency for Safety and Health at Work (EU-OSHA) is 5 ppmv [2]. The permissible exposure limit value for H 2 S is 10 ppmv, the Immediately Dangerous to Life and Health (IDLH) level is 300 ppmv and lethal concentrations are in the range of 2000 ppmv [2]. In practice, concentrations ranging from sub-ppmv levels at low pressures to several per cents at atmospheric conditions need to be monitored. Despite a variety of online monitoring options for gaseous H 2 S, its reliable quantitative and selective determination still remains challenging in the field of chemical sensors [3][4][5].In the field of laser spectroscopy, the constant improvement of quantum cascade lasers (QCLs) has led to their application as reliable sources of coherent light ranging from the mid-infrared (MIR) to the terahertz spectral region for sensitive detection of molecular species on their fundamental vibrational, respectively, rotational bands [6][7][8][9]. Due to their tailorable emission wavelength, high output power, compactness, narrow spectral linewidth, and wavelength tuneability, QCLs are optimal choices for spectroscopic applications. In addition, optical resonator designs are constantly improved over the years with the distributed feedback (DFB) [10] and the external cavity (EC) [11] approach being the most prominent ones. A general aim with respect to the ongoing development of QCLs for sensing applications is to reduce the line width of the emitted radiation to a minimum while achieving a spectral coverage as large as possible. So far, EC-QCLs offer the largest tuning range which, depending on the employed gain medium, may cover up to several hundreds of wavenumbers. The external cavity design facilitates broadband spectral tuning by an external diffraction grating, while the selection of the emission wavelength takes place by changing the grating angle relative to the QCL chip.Abstract Hydrogen sulfide (H 2 S) trace gas detection based on off-beam quartz-enhanced photoacoustic spectroscopy using a continuous wave (CW), mode-hop-free external cavity (EC) quantum cascade laser tunable from 1310 to 1210 cm −1 was performed. A 1σ minimum detection limit of 492 parts per billion by volume (ppbv) using a 1 s lock-in time constant was obtained by targeting the line centered at 1234.58 cm . This value corresponds to a normalized noise equivalent absorption coefficient for H 2 S of 3.05 × 10 −9 W cm −1 Hz −1/2 .

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“…PA detection of trace gases is one of the most sensitive techniques of infrared absorption spectroscopy [9][10][11][12]. The success of PA gas detection crucially depends on the availability and performance of excitation light sources in combined with appropriate detection schemes.…”

Section: Introductionmentioning

confidence: 99%

Portable Laser Photoacoustic Methane Sensor Based on FPGA

Wang

Liu

2016

Preprint

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A portable laser photoacoustic sensor based on a Field-Programmable Gate Array (FPGA) is reported for methane detection. A tunable DFB diode laser in the 1654 nm wavelength range is used as an excitation source. The photoacoustic signal processing was implemented by a FPGA device. A small resonant photoacoustic cell is designed. The minimum detection limit (1σ) of 10 ppm for methane (CH4) is demonstrated.

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Atmospheric CH_4 and N_2O measurements near Greater Houston area landfills using a QCL-based QEPAS sensor system during DISCOVER-AQ 2013

Cited by 64 publications

References 21 publications

Simultaneous atmospheric nitrous oxide, methane and water vapor detection with a single continuous wave quantum cascade laser

Simultaneous atmospheric nitrous oxide, methane and water vapor detection with a single continuous wave quantum cascade laser

Off-beam quartz-enhanced photoacoustic spectroscopy-based sensor for hydrogen sulfide trace gas detection using a mode-hop-free external cavity quantum cascade laser

Portable Laser Photoacoustic Methane Sensor Based on FPGA

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