Fast simultaneous measurement of multi-gases using quantum cascade laser photoacoustic spectroscopy |
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| Authors: | W Liu L Wang L Li J Liu F-Q Liu and Z Wang |
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| Institution: | (1) Faculty of Pharmacy and Biochemistry, University of Zagreb, A. Kovačića 1, 10000 Zagreb, Croatia;(2) Laboratory of Biophysics, Wageningen University, Dreijenlaan 3-Transitorium, 6703 HA Wageningen, The Netherlands;(3) Faculty of Agronomy, University of Zagreb, Svetošimunska 25, 10000 Zagreb, Croatia;(4) Centro de Investigacion en Ciencia Aplicada y Tecnologia Avanzada, IPN, Legaria 694, Colonia Irrigacion, 11500 Mexico, DF, Mexico |
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| Abstract: | The authors developed a fast simultaneous method in detecting multi-gases using quantum cascade laser (QCL) based photoacoustic
(PA) spectroscopy. We demonstrated the simultaneous measurement of CO and SO2 concentrations using two QCLs working at 4.56 and 7.38 μm, corresponding to the absorption bands of CO and SO2, respectively. The modulation frequencies of the two QCLs were 234 and 244 Hz. The response time was 0.6 seconds. A computer
sound card was used to process the PA signals. Fast Fourier transform was an essential step to get the amplitudes of the PA
signals at different frequencies. The concentration of each gas can be obtained from the PA signal amplitude at the corresponding
modulation frequency. |
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