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|Type:||Artigo de evento|
|Title:||A Photoacoustic Spectrometer For Trace Gas Detection|
|Abstract:||A high-resolution external laser photoacoustic spectrometer has been developed for trace gas detection with absorption transitions in coincidence with CO 2 laser emission lines (9,2-10,9 μm: 920-1086 cm -1). The CO 2 laser operates in 90 CW lines with power of up to 15 W. A PC-controlled step motor can tune the laser lines. The resonance frequency of first longitudinal mode of the photoacoustic cell is at 1600 Hz. The cell Q-factor and cell constant are measured close to 50 and 28 mVcmW -1 respectively. The spectrometer has been tested in preliminary studies to analyze the absorption transitions of ozone (O 3). The ethylene (C 2H 4 from papaya fruit is also investigated using N 2 as carrier gas at a constant flow rate. © EDP Sciences.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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