Photoacoustic detection of NO2 traces with CW and pulsed green lasers

Slezak, V.; Santiago, Guillermo; Peuriot, A.

doi:10.1016/s0143-8166(02)00062-3

Cited by 28 publications

(11 citation statements)

References 5 publications

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“…Photoacoustic detection has been successfully employed in a wide range of scientific fields, e.g., in research related to the environment [56,57], medicine [58] and biology [59]. Kreuzer first reported the detection of very low concentra− tions of gases using photoacoustic detection in combination with a nonresonating cell [60].…”

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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Section: Infrared Laser Diode Photoacoustic Detectionmentioning

confidence: 99%

Infrared diode laser spectroscopy

Civiš

Cihelka²,

Matulková

2010

Opto-Electronics Review

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“…Likewise, the collision energy transfer from laser-excited levels is very efficient because of the long natural lifetime of the NO 2 excited levels [2][3][4][5]. It is only possible due to the presence of a strong absorption band of NO 2 at 532 nm for which the lifetime of the excited levels is longer [6,7]. Therefore, the collision energy transfer with the buffer gas leads to efficient heating of the mixture.…”

Section: Introductionmentioning

confidence: 99%

Pulsed Photoacoustic Spectroscopy of I2 and NO2

Yehya

Chaudhary

2012

Int J Thermophys

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A novel approach based on the use of λ = 532 nm pulsed radiation obtained by the second-harmonic generation from the Q-switched Nd: YAG laser and its application for excitation of acoustic modes in a specially designed multi-resonant high-Q factor photoacoustic (PA) cell is reported. The cell is employed for time-domain spectroscopic studies of gaseous NO 2 and I 2 molecules. The time-resolved spectra of NO 2 and I 2 were recorded up to 8000 Hz and 26 000 Hz, respectively. It has been demonstrated for the first time that excited cavity modes which correspond to different transition lines of the I 2 molecules show different behaviors under different pressure and input laser energy. The lowest limit of detection attained with the proposed PA system for NO 2 buffered in realistic air was 14.6 ppbV.

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“…Photo-acoustic spectroscopy (PAS) is one of the most sensitive and straightforward spectroscopic techniques for NO 2 detection [9][10][11][12]. A detection limit as low as 200 ppt in 1 s has been demonstrated in the visible region with a high-power blue laser [11].…”

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confidence: 99%

Parts-per-trillion-level detection of nitrogen dioxide by cantilever-enhanced photo-acoustic spectroscopy

2015

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We present a simple and highly sensitive cantilever-enhanced photo-acoustic sensor for detection of nitrogen dioxide. A noise equivalent detection limit of 50 parts-per-trillion in 1 s is demonstrated. The limit was reached with an average optical power of 4.7 W using a continuous-wave laser at 532 nm. The achieved normalized noise equivalent absorption coefficient was 2.6×10(-10) W cm(-1) Hz(-1/2).

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Photoacoustic detection of NO2 traces with CW and pulsed green lasers

Cited by 28 publications

References 5 publications

Infrared diode laser spectroscopy

Infrared diode laser spectroscopy

Pulsed Photoacoustic Spectroscopy of I2 and NO2

Parts-per-trillion-level detection of nitrogen dioxide by cantilever-enhanced photo-acoustic spectroscopy

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