| Zugriffsnummer | 31486 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | Optical path length calibration: A standard approach for use in absorption cell-based IR-spectrometric gas analysis |
| Autor(in); Institution |
Nwaboh, Javis; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Witzel, Oliver; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Pogány, Andrea; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Werhahn, Olav; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Ebert, Volker; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
|
| Quelle/Jahr | International Journal of Spectroscopy:(2014), 9 S. |
| Artikelnummer | 132607 |
| ISSN | 1687-9449 (PRINT) ; 1687-9457 (ONLINE) |
| DOI | |
| Verlag | New York, NY: Hindawi |
| Freie Schlagworte | Laser spectroscopy ; Optical path length ; laser-based gas metrology ; gas analysis |
| Zusammenfassung | We employed a comparison method to determine the optical path length of gas cells which can be used in spectroscopic setups based on laser absorption spectroscopy, or FTIR. The method is based on absorption spectroscopy itself. A reference gas cell, whose length is a priori known and desirably traceable to the international system of units (SI), and a gas mixture are used to calibrate the path length of a cell under test. By comparing spectra derived from pressure-dependent measurements on the two cells, the path length of the gas cell under test is determined. The method neither relies on the knowledge of the gas concentration nor on the line strength parameter of the probed transition which is very rarely traceable to the SI and of which the uncertainty is often relatively large. The method is flexible such that any infrared light source and infrared active molecule with isolated lines can be used. We elaborate on the method, substantiate the method by reporting results of this calibration procedure applied to multipass and single pass gas cells of lengths from 0.38 m to 21 m, and compare this to other methods. The relative combined uncertainty of the path length results determined using the comparison method was found to be in the ±0.4 % range. |
| Kostenfreier Zugang | Open Access Gold |
| Rechteinformation | CC BY 3.0 ; Creative Commons Attribution 3.0 License |
| Innovationscluster | Umwelt und Klima |