title: Two-Line Laser-Induced Fluorescence Imaging of Vibrational Temperatures in a NO-Seeded Flame.
abstract: Two-dimensional temperature 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 (2)?(+)-X (2)? system are well known from previous studies. The energy difference of 1974 cm(-1) between the (0, 0)Q(1) + P(21)(33.5) and the (0, 2)O(12)(5.5) lines offers great sensitivity in the temperature 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 H(2), 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.
authors: W G
authors: WG
authors: Bessler
authors: F
authors: F
authors: Hildenbrand
authors: C
authors: C
authors: Schulz