Two-line laser-induced fluorescence imaging of vibrational temperatures in a NO-seeded flame
- 20 February 2001
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 40 (6) , 748-756
- https://doi.org/10.1364/ao.40.000748
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 2Σ+–X 2Π 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)O12(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 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.Keywords
This publication has 34 references indexed in Scilit:
- Quasi-instantaneous two-dimensional temperature measurements in a spark ignition engine using 2-line atomic fluorescenceSymposium (International) on Combustion, 1998
- Quantitative 2D single-shot imaging of no concentrations and temperatures in a transparent SI engineSymposium (International) on Combustion, 1996
- Temperature and pressure dependences of the laser-induced fluorescence of gas-phase acetone and 3-pentanoneApplied Physics B Laser and Optics, 1996
- Collisional broadening of spectral lines in the A-X (0-0) system of NO by N2, Ar, and He at elevated pressures measured by laser-induced fluorescenceJournal of Quantitative Spectroscopy and Radiative Transfer, 1995
- Temporally resolved, two-line fluorescence imaging of NO temperature in a transverse jet in a supersonic cross flowApplied Optics, 1993
- Temperature measurements in gases by use of planar laser-induced fluorescence imaging of NOApplied Optics, 1993
- Method for planar measurement of temperature in compressible flow using two-line laser-induced iodine fluorescenceOptics Letters, 1990
- Single-pulse gas thermometry at low temperatures using two-photon laser-induced fluorescence in NO–N_2 mixturesOptics Letters, 1983
- Radiative lifetimes and electronic quenching rate constants for single-photon-excited rotational levels of no (A2Σ+, ν′ = 0)Journal of Quantitative Spectroscopy and Radiative Transfer, 1982
- Laser rayleigh thermometry in turbulent flamesSymposium (International) on Combustion, 1981