Resonant photoacoustic simultaneous detection of methane and ethylene by means. of a 1.63-μm diode laser

Boschetti, A.; Bassi, Davide; Iacob, E.; Iannotta, Salvatore; Ricci, Leonardo; Scotoni, M.

doi:10.1007/s003400200790

Cited by 46 publications

(13 citation statements)

References 26 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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“…Trace gas monitoring systems based on PAS have been investigated by many groups all around the world [3][4][5][6][7][8][9][10][11][12][13][14]. Different types of cell configurations (non-resonant [3]; radial [4][5][6], azimuthal [7,8] or longitudinal [9][10][11] resonances of a cylindrical resonator; Helmholtz resonators [12,13]) and different kinds of exciting laser sources (gas lasers [4][5][6]; DFB semiconductor laser diodes [7][8][9]13]; external cavity laser diodes [10,11]; quantum cascade lasers [12,14]) have been used in laboratory systems, showing extremely good performances.…”

Section: Introductionmentioning

confidence: 99%

“…Different types of cell configurations (non-resonant [3]; radial [4][5][6], azimuthal [7,8] or longitudinal [9][10][11] resonances of a cylindrical resonator; Helmholtz resonators [12,13]) and different kinds of exciting laser sources (gas lasers [4][5][6]; DFB semiconductor laser diodes [7][8][9]13]; external cavity laser diodes [10,11]; quantum cascade lasers [12,14]) have been used in laboratory systems, showing extremely good performances. However, only few PA-based systems have found commercial applications up to now.…”

Section: Introductionmentioning

confidence: 99%

Ammonia monitoring at trace level using photoacoustic spectroscopy in industrial and environmental applications

Schilt

Thévenaz

Niklès³

et al. 2004

Spectrochimica Acta Part A: Molecular and Biomolecular Spectros

132

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An ammonia traces analyser based on photoacoustic spectroscopy is described. The system uses a CO 2 laser and a properly designed resonant photoacoustic cell to achieve ammonia detection at sub-parts-per-billion (ppb) level. The instrument features unattended automatic on-line monitoring of ammonia with a detection limit of 0.1 ppb. Interferences from atmospheric CO 2 and H 2 O are efficiently suppressed by a careful selection of the laser wavelength and a compensation of the water vapour signal made with a high-precision hygrometer. The cell design enables continuous measurement at high flow rates (up to 5 l/min), which guarantees a fast response time of the system for the monitoring of ammonia, a sticky polar molecule that adheres to most surfaces. Various examples of applications of the instrument in the semiconductor industry and for atmospheric pollution monitoring are presented. They demonstrate the excellent performances of the system and its suitability for these applications.

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“…To amplify the signal, the acoustic resonance of the chamber may be used. There are a number of open windowless cells reported in the literature, and in most cases, signal amplification is based on the standing wave resonances [1][2][3][10][11][12][13][14]. Such cells are usually of relatively large volumes, so their applications are strongly limited.…”

Section: Open Photoacoustic Helmholtz Cellmentioning

confidence: 99%

Signal-to-Noise Analysis of the Improved Open Photoacoustic Helmholtz Cell

Geras

2014

Int J Thermophys

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Open photoacoustic cells are often used in continuous-flow photoacoustic measurements. Such cells are sensitive to external noise penetration. The improved open photoacoustic Helmholtz cell has much better external noise attenuation than the previously known designs. This paper describes how mechanical dimensions of such a cell influence its signal-to-noise ratio. The analysis was performed by means of computer simulations based on the loss-improved transmission line model. This research showed that the mechanical parameters affect signal-to-noise noticeably and, if they are properly chosen and applied in the design of the improved open cell, the resulting signal-to-noise ratio may be improved by almost 60 dB in comparison to previous designs of open photoacoustic Helmholtz cells.

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Resonant photoacoustic simultaneous detection of methane and ethylene by means. of a 1.63-μm diode laser

Abstract: The intensity values for the ν 5 + ν 9 band of C 2 H 4 reported in Fig. 2a are overestimated by a factor of four as a result of a normalization error. ✉

Cited by 46 publications

References 26 publications

Application of antimonide diode lasers in photoacoustic spectroscopy

Application of antimonide diode lasers in photoacoustic spectroscopy

Ammonia monitoring at trace level using photoacoustic spectroscopy in industrial and environmental applications

Signal-to-Noise Analysis of the Improved Open Photoacoustic Helmholtz Cell

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