| Zugriffsnummer | 31328 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | mit Peer Review |
| Sprache | Englisch |
| Titel | VCSEL-based, high-speed, in situ TDLAS for in-cylinder water vapor measurements in IC engines |
| Autor(in); Institution |
Witzel, Oliver; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Klein, Alexander; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
Meffert, C.; Universität Duisburg-Essen, Duisburg, GERMANY
Wagner, S.; TU Darmstadt, Darmstadt, GERMANY
Kaiser, S.; Universität Duisburg-Essen, Duisburg, GERMANY
Schulz, C.; Universität Duisburg-Essen, Duisburg, GERMANY
Ebert, Volker; 3.2, Gasanalytik und Zustandsverhalten, PTB-Braunschweig
|
| Quelle/Jahr | Optics Express: 21 (2013), 17, 19951 - 19965 |
| Availability | [online only] |
| ISSN | 1094-4087 |
| DOI | |
| Freie Schlagworte | TDLAS ; absorption spectroscopy ; IC engine ; water vapor ; H2O ; VCSEL |
| Zusammenfassung | We report the first application of a vertical-cavity surface-emitting laser (VCSEL) for calibration- and sampling-free, high-speed, in situ H2O concentration measurements in IC engines using direct TDLAS (tunable diode laser absorption spectroscopy). Measurements were performed in a single-cylinder research engine operated under motored conditions with a time resolution down to 100 μs (i.e., 1.2 crank angle degrees at 2000 rpm). Signal-to-noise ratios (1σ) up to 29 were achieved, corresponding to a H2O precision of 0.046 vol.% H2O or 39 ppm•m. The modulation frequency dependence of the performance was investigated at different engine operating points in order to quantify the advantages of VCSEL against DFB lasers. |
| Kostenfreier Zugang | Open Access Gold |