کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9757447 | 1496004 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Selective differential photoacoustic method for trace gas analysis
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آنالیزی یا شیمی تجزیه
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
A selective differential photoacoustic method for trace gas measurements is introduced. The method combines long path absorption spectroscopy with photoacoustic spectroscopy. A photoacoustic cell, equipped with a highly sensitive cantilever pressure sensor, was used as a selective detector for broadband IR-radiation passed through the sample gas. Therefore, an additional optical filter is not required. The detection limit at level of 10Â ppb for methane was obtained (0.37Â s measurement time and approximately 1Â m effective absorption path). The sensitivity of the conventional photoacoustic method was enhanced by factor 2.8. The selectivity was tested by measuring the cross-interference signal between methane, carbon dioxide and butane in different conditions. The differential method enabled perfect separation of methane and carbon dioxide. Butane caused only one fifth of the cross-interference signal with methane compared to a cross-interference measured with a conventional filter system.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Vibrational Spectroscopy - Volume 38, Issues 1â2, 29 July 2005, Pages 3-9
Journal: Vibrational Spectroscopy - Volume 38, Issues 1â2, 29 July 2005, Pages 3-9
نویسندگان
J. Uotila, V. Koskinen, J. Kauppinen,