NO trace gas sensor based on quartz-enhanced photoacoustic spectroscopy and external cavity quantum cascade laser

Spagnolo, Vincenzo; Kosterev, Anatoliy A.; Lewicki, R.; Tittel, Frank K.

doi:10.1007/s00340-010-3984-z

Cited by 133 publications

(77 citation statements)

References 25 publications

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“…Recent studies reported that the optimum length of each mR tube is between λ s /4 and λ s /2 where λ s is the wavelength of sound [3,5]. [11][12][13][14][15][16]. QEPAS has also been demonstrated with larger molecules with broad, unresolved absorption spectra, such as ethanol, acetone and freon [17].…”

Section: Introductionmentioning

confidence: 99%

Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen

et al. 2012

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Section: Introductionmentioning

confidence: 99%

Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen

et al. 2012

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“…With the best alignment conditions, it is possible to achieve 96.4% transmission of the incident THz laser beam between the QTF prongs. This is a crucial point to minimize the noise related with the direct illumination of QTF prongs by the laser beam [18,19]. Data acquisition and real-time analysis were performed using a lock-in amplifier (Stanford Research Model SR830) and a function generator (Tektronix model AFG3102) controlled by a Labview-based software.…”

Section: Methodsmentioning

confidence: 99%

THz Quartz-enhanced photoacoustic sensor for H_2S trace gas detection

Spagnolo¹,

Patimisco²,

Pennetta³

et al. 2015

Opt. Express

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Abstract:We report on a quartz-enhanced photoacoustic (QEPAS) gas sensing system for hydrogen sulphide (H 2 S) detection. The system architecture is based on a custom quartz tuning fork (QTF) optoacoustic transducer with a novel geometry and a quantum cascade laser (QCL) emitting 1.1 mW at a frequency of 2.913 THz. The QTF operated on the first flexion resonance frequency of 2871 Hz, with a quality factor Q = 17,900 at 20 Torr. The tuning range of the available QCL allowed the excitation of a H 2 S rotational absorption line with a line-strength as small as S = 1.13·10−22 cm/mol. The measured detection sensitivity is 30 ppm in 3 seconds and 13 ppm for a 30 seconds integration time, which corresponds to a minimum detectable absorption coefficient α min = 2.3·10 −7 cm −1 and a normalized noise-equivalent absorption NNEA = 4.4·10 −10 W·cm −1 ·Hz -1/2 , several times lower than the values previously reported for near-IR and mid-IR H 2 S QEPAS sensors.

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“…Moreover, new applications for gas sensing are emerging due to their compact size, robust construction and low power requirements. QCLs emitting in the NO fundamental vibration-rotation band (centred at 5.2 µm) have in recent years triggered the development of QCL-based NO sensors using various spectroscopic methods including direct absorption spectroscopy using multi-pass cells [12], wavelength modulation spectroscopy [13], photoacoustic spectroscopy [14], FRS [15] and high-finesse cavities for extreme absorption path length, i.e. cavity ring-down spectroscopy and on/off-axis integrated cavity output spectroscopy [16,17].…”

Section: Quantum Cascade Laser-based Spectroscopy For No Detectionmentioning

confidence: 99%

Spectroscopic monitoring of NO traces in plants and human breath: applications and perspectives

et al. 2012

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Optical methods based on quantum cascade lasers (QCLs) are becoming popular in many life science applications. We report on two trace gas detection schemes based on continuous wave QCLs for on-line detection of nitric oxide (NO) at the sub-part-per-billion level by volume (ppbv, 1 : 10 −9 ), using wavelength modulation spectroscopy (WMS) and Faraday rotation spectroscopy (FRS) at 1894 cm −1 and 1875.73 cm −1 , respectively. Several technical incremental steps are discussed to further improve the sensitivity of these methods. Examples are included to demonstrate the merits of WMS-based sensor: direct monitoring of NO concentrations in exhaled breath, and from plants under pathogen attack. A simple hand-held breath sampling device that allows single breath collection at various exhalation flows (15, 50, 100 and 300 mL/s, respectively) is developed for off-line measurements and validated in combination with the WMS-based sensor. Additionally, the capability of plants to remove environmental NO is presented.

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NO trace gas sensor based on quartz-enhanced photoacoustic spectroscopy and external cavity quantum cascade laser

Cited by 133 publications

References 25 publications

Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen

Compact QEPAS sensor for trace methane and ammonia detection in impure hydrogen

THz Quartz-enhanced photoacoustic sensor for H_2S trace gas detection

Spectroscopic monitoring of NO traces in plants and human breath: applications and perspectives

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