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Allan variance for optimal signal averaging—monitoring by diode-laser and CO2 laser photo-acoustic spectroscopy |
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| Authors: | Jan Sk?í nský ,Radmila Jane?ková ,Eva Grigorová ,Michal St?i?í k,Pavel Kubá t,Vá clav Nevrlý ,Zdeněk Zelinger,Svatopluk Civi&scaron |
| Affiliation: | a J. Heyrovský Institute of Physical Chemistry, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 3, 182 23 Prague 8, Czech Republic b Faculty of Safety Engineering, VSB-Technical University of Ostrava, Lumírova 13, 70030 Ostrava 3-Výškovice, Czech Republic c Institute of Thermomechanics, v.v.i., Academy of Sciences of the Czech Republic, Dolejškova 5, 18200 Prague 8, Czech Republic |
| Abstract: | The concept of the Allan variance has been utilized to test the detection abilities of two powerful experimental methods for trace gas monitoring: IR diode-laser and CO2 laser photo-acoustic spectroscopy. The detection of stable molecules (OCS, allene, CH3OH), and unstable species (ozone, short-lived free radical CN and molecular ion ArD+) have been compared. An approach for studies of the influence of the reactivity on the optimal averaging time for the minimum detectable concentration is demonstrated. |
| Keywords: | Allan variance Diode-laser spectroscopy Photo-acoustic spectroscopy |
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