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Allan Variance Stability of Diode-Laser Spectrometer for Monitoring of Gas Concentrations
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SYSNO ASEP 0506980 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Allan Variance Stability of Diode-Laser Spectrometer for Monitoring of Gas Concentrations Author(s) Skříňský, J. (CZ)
Skřínská, M. (SK)
Zelinger, Zdeněk (UFCH-W) RID, ORCIDSource Title Proceedings 2014 International Conference on Mathematics and Computers in Sciences and in Industry, MCSI 2014. - New York : IEEE, 2014 - ISBN 978-1-4799-4324-1 Pages s. 159-164 Number of pages 6 s. Publication form Print - P Action International Conference on Mathematics and Computers in Sciences and in Industry Event date 13.09.2014 - 15.09.2014 VEvent location Varna Country BG - Bulgaria Event type WRD Language eng - English Country US - United States Keywords Allan variance ; CN radical ; laser-diode spectrometry ; ocs ; stability Subject RIV CF - Physical ; Theoretical Chemistry OECD category Physical chemistry Institutional support UFCH-W - RVO:61388955 UT WOS 000380446200026 EID SCOPUS 84949927898 DOI 10.1109/MCSI.2014.53 Annotation It has been proven that the characteristic of laser frequency stability is critically important for evaluation of metrology system performance when the function principle is based on laser-diode spectrometry. Trace gas measurements were calculated in the frequency domain and consequently recalculated to the time domain for the Allan variance expression. Detection of stable molecule unstable specie radical CN and OCS molecule has been compared. The Allan variance is mathematically defined, and then its behavior is extensively tested on experimental data. These are used to obtain modified and overlapping Allan variances in a dependency on the averaging time. Simultaneously, the integral formula for the direct conversion from the frequency to the time domain is used to get results for comparison. The stability analyses were determined by 2000 s measurements. Results show the possibilities of the presented procedure that is going to be used for the evaluation of direct time domain laser frequency stability measurements. Results are focused on the area of influence of the reactivity on the optimal averaging time for the minimum detectable concentration is demonstrated where a question of the frequency stability is very important. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2020
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