Bessler, W.G.; Hildenbrand, F.; Schulz, Christof:
Two-line laser-induced fluorescence imaging of vibrational temperatures in a NO-seeded flame
2001
In: Appl. Opt., Jg. 40 (2001), Heft 6, S. 748 - 756
Artikel/Aufsatz in Zeitschrift / Fach: Maschinenbau
Titel:
Two-line laser-induced fluorescence imaging of vibrational temperatures in a NO-seeded flame
Autor(in):
Bessler, W.G.; Hildenbrand, F.; Schulz, Christof im Online-Personal- und -Vorlesungsverzeichnis LSF anzeigen
Erscheinungsjahr:
2001
Erschienen in:
Appl. Opt., Jg. 40 (2001), Heft 6, S. 748 - 756

Abstract:

Two-dimensional temp. fields are measured in lean and sooting flames by means of two-color laser-induced fluorescence (LIF) imaging that uses seeded NO. Vibrational thermometry is performed by the probing of different vibrational ground-state levels. Spectral properties of the excited transitions within the A 2S+-X2P system are well known from previous studies. The energy difference of 1974 cm-1 between the (0,0)Q1 + P21(33.5) and the (0,2)O12(5.5) lines offers great sensitivity in the temp. range that is relevant for combustion processes. Excitation is possible by use of a tunable KrF excimer laser on its fundamental (248 nm) and Raman shifted (in H2, 225 nm) wavelengths. An excitation scheme for instantaneous two-line measurements by use of a single laser is developed. The possibility of single-shot measurements is discussed.