Affiliations: School of Engineering and Center for Advanced
Metrology, Chubu University, 1200 Matsumoto, Kasugai, Aichi, 487-8501, Japan.
E-mail: txh@isc.chubu.ac.jp | Center for Advanced Metrology, Chubu University, 1200
Matsumoto, Kasugai, Aichi, 487-8501, Japan | Noritake Company Limited, 3-1-36, noritake, nishi-ku,
Nagoya, Aichi, 451-8501, Japan | Division of Mechanical and Space Engineering, Graduate
School of Engineering, Hokkaido University, N 13 W 8, Kita-ku, Sapporo
060-8628, Japan
Abstract: The present study has been carried out with the aim of developing a
technique for measuring two-dimensional gas temperature profiles based on
two-color fluorescence induced by a one-color laser. The laser sheet of the
fourth harmonic (266 nm) from a Nd:YAG laser induced fluorescence in species
doped in a nitrogen gas flow. The LIF spectra of seven fluorescent species,
namely acetone, methylethylketone, acetaldehyde ethylbenzene, anisole, aniline,
and naphthalene, were measured to select the best prospective pair of
fluorescent species for this technique. Ethylbenzene and naphthalene show
relatively high LIF intensities and their LIF spectra overlap less with each
other than with other species. Also, ethylbenzene has a high temperature
dependence while naphthalene has a low temperature dependence. Thus by
selecting one portion of wavelengths in the range where ethylbenzene or
naphthalene is dominant, the temperature of the gas can be determined using the
ratio of LIF intensities of the mixture at the two wavelengths with good
temperature sensitivity. In addition, a general principle is presented for
finding out an optimum pair of wavelengths to obtain a good temperature
sensitivity in those LIF spectra.
Keywords: Temperature Measurement, Laser Induced Fluorescence, Fluorescent Species, Temperature Sensitivity, Laser Sheet
