Methane detection on the sub-ppm level with a near-infrared diode laser photoacoustic sensor

Zéninari, V.; Parvitte, B.; Courtois, D.; Kapitanov, V. A.; Ponomarev, Yu. N.

doi:10.1016/s1350-4495(03)00135-x

Cited by 57 publications

(27 citation statements)

References 12 publications

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“…Taking into account the low optical power injected in the PA cell (typically 0.3 mW), the obtained sensitivity is comparable to results previously reported in the 1.65 m range using standard telecommunication DFB lasers and longitudinal acoustic resonators [12][13][14], but slightly lower than values reached using differential Helmholtz resonators [15,16]. These results are however far from the best reported sensitivity (close to 1 ppb) for PA methane detection [17], achieved in the 3.3 m region, where the CH 4 absorption is more than one-order of magnitude higher than in the 1.65 or 2.37 m ranges, and with a 200 times higher optical power delivered by an optical parametric oscillator.…”

Section: Resultssupporting

confidence: 84%

Application of antimonide diode lasers in photoacoustic spectroscopy

Schilt

Vicet

Werner

et al. 2004

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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First investigations of photoacoustic (PA) spectroscopy (PAS) of methane using an antimonide semiconductor laser are reported. The laser fabrication is made in two steps. The structure is firstly grown by molecular beam epitaxy, then a metallic distributed-feedback (DFB) grating is processed. The laser operates at 2371.6 nm in continuous wave and at room temperature. It demonstrates single-mode emission with typical tuning coefficients of 0.04 nm mA −1 and 0.2 nm K −1 . PA detection of methane was performed by coupling this laser into a radial PA cell. A detection limit of 20 ppm has been achieved in a preliminary configuration that was not optimised for the laser characteristics.

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Section: Resultssupporting

confidence: 84%

Application of antimonide diode lasers in photoacoustic spectroscopy

Schilt

Vicet

Werner

et al. 2004

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

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“…This is not a restriction with diode lasers, which can be easily tuned. Technological development in the near infra− red has been of great importance in enabling application of photoacoustic detection with semiconductor laser sources having sufficient power to excite a photoacoustic signal [54,55]. Vansteenkiste et al [54] carried out the first appli− cations of diode lasers in the infrared region in combination with photoacoustic detection in 1981.…”

Section: Infrared Laser Diode Photoacoustic Detectionmentioning

confidence: 99%

Infrared diode laser spectroscopy

Civiš

Cihelka²,

Matulková

2010

Opto-Electronics Review

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Three types of lasers (double-heterostructure 66 K InAsSb/InAsSbP laser diode, room temperature, multi quantum wells with distributed feedback (MQW with DFB) (GaInAsSb/AlGaAsSb based) diode laser and vertical cavity surface emitting lasers (VCSELs) (GaSb based) have been characterized using Fourier transform emission spectroscopy and compared. The photoacoustic technique was employed to determine the detection limit of formaldehyde (less than 1 ppmV) for the strongest absorption line of the v3 + v5 band in the emission region of the GaInAsSb/AlGaAsSb diode laser. The detection limit (less than 10 ppbV) of formaldehyde was achieved in the 2820 cm−1 spectral range in case of InAsSb/InAsSbP laser (fundamental bands of v1, v5). Laser sensitive detection (laser absorption together with high resolution Fourier transform infrared technique including direct laser linewidth measurement, infrared photoacoustic detection of neutral molecules (methane, form-aldehyde) is discussed.Additionally, very sensitive laser absorption techniques of such velocity modulation are discussed for case of laser application in laboratory research of molecular ions. Such sensitive techniques (originally developed for lasers) contributed very much in identifying laboratory microwave spectra of a series of anions (C6H−, C4H−, C2H−, CN−) and their discovery in the interstellar space (C6H−, C4H−).

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“…To subtract signals from two microphones, analog differential amplifiers are often used [6][7][8]. A typical electronic circuit performing differential detection in a photoacoustic system [9] is shown in Fig.…”

Section: Digital Differential Detectionmentioning

confidence: 99%

Photoacoustic Cell with Digital Differential Detection

Suchenek

2015

Int J Thermophys

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Solutions which reduce the impact of the external acoustic noise on the photoacoustic signal rely often on the appropriate modification of the photoacoustic cell structure. The goal is to obtain a frequency response of the cell which suppresses the external noise as much as possible. Another approach is differential detection, in which two microphones are used, and assuming that the external noise signal components from both microphones are identical, their subtraction should result in canceling the external noise. The main difficulty of that solution is that both microphone signal paths should be calibrated to have virtually identical characteristics. The paper presents a differential photoacoustic cell with digital differential detection.

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Methane detection on the sub-ppm level with a near-infrared diode laser photoacoustic sensor

Cited by 57 publications

References 12 publications

Application of antimonide diode lasers in photoacoustic spectroscopy

Application of antimonide diode lasers in photoacoustic spectroscopy

Infrared diode laser spectroscopy

Photoacoustic Cell with Digital Differential Detection

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