2011
DOI: 10.1134/s1054660x11070061
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Evaluation of ammonia absorption coefficients by photoacoustic spectroscopy for detection of ammonia levels in human breath

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Cited by 28 publications
(38 citation statements)
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“…The absorption coefficients of ethylene and ammonia at different CO 2 laser wavelengths were precisely measured previously 23,24,48,49 and the CO 2 laser was kept tuned at the 10P (14) line (10.53 μm) where ethylene exhibit a strong peak, corresponding to an absorption coefficient of 30.4 cm −1 atm −1 and at 9R(30) CO 2 laser line (9.22 μm), where the ammonia absorption coefficient has the maximum value of 57 cm −1 atm −1 .…”
Section: Co 2 Lpas Analysesmentioning
confidence: 99%
“…The absorption coefficients of ethylene and ammonia at different CO 2 laser wavelengths were precisely measured previously 23,24,48,49 and the CO 2 laser was kept tuned at the 10P (14) line (10.53 μm) where ethylene exhibit a strong peak, corresponding to an absorption coefficient of 30.4 cm −1 atm −1 and at 9R(30) CO 2 laser line (9.22 μm), where the ammonia absorption coefficient has the maximum value of 57 cm −1 atm −1 .…”
Section: Co 2 Lpas Analysesmentioning
confidence: 99%
“…The absorption coefficients of ethylene at different CO 2 laser wavelengths were precisely measured previously [25,26].…”
Section: Resultsmentioning
confidence: 99%
“…The schematic diagram of the LPAS system is illustrated in Figure 1 and is described in [21][22][23][24][25][26] with details of the general setup especially our resonant PA cell, the formula for the response of the system, the line tunability of the frequency stabilized CO 2 laser, the quality factor of the PA cell, and a list of protocols to obtain a minimum detectable concentration as low as possible.…”
Section: Lpas Experimental Setupmentioning
confidence: 99%
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“…on the nitro group for explosives) [1]. LPAS takes advantage of detecting the optical energy absorbed by molecules after their relaxation into an acoustic wave, and it employs fre quency modulation on a continuous laser beam to allow the generation of acoustic waves in a resonant photo acoustic cell [2][3][4][5].…”
Section: Introductionmentioning
confidence: 99%