Rotational CARS thermometry at high temperature (1800 K) and high pressure (0.1–1.55 MPa)

✍ Scribed by F. Vestin; M. Afzelius; H. Berger; F. Chaussard; R. Saint-Loup; P.-E. Bengtsson

• Book ID: 102426701
• Publisher: John Wiley and Sons
• Year: 2007
• Tongue: English
• Weight: 448 KB
• Volume: 38
• Category: Article
• ISSN: 0377-0486
• DOI: 10.1002/jrs.1779

✦ Synopsis

Abstract

Dual‐broadband rotational CARS (DB‐RCARS) thermometry has been investigated at high temperature and high pressure. Single‐shot measurements were performed at 1800 K, in air and nitrogen at pressures up to 1.55 MPa and in oxygen at pressures up to 0.5 MPa. For all conditions, the resonant signal contribution to the spectra clearly dominated over the non‐resonant one, implying the high potential for DB‐RCARS for temperature and concentration measurements also at the high temperatures and pressures used in the present investigation. The relative standard deviation was generally ∼2% for single‐shot data at pressures from 0.5 to 1.55 MPa. At the investigated temperature, 1800 K, rotational lines from thermally excited vibrational states could be observed in the highly resolved experimental spectra. Using a previously developed weighting procedure applied to these lines, it was demonstrated that the temperature standard deviation could be lowered with as much as 30%. Copyright © 2007 John Wiley & Sons, Ltd.