Comparisons of Soot Volume Fraction Measurements Using Optical and Isokinetic Sampling Techniques.
Comparisons of Soot Volume Fraction Measurements Using
Optical and Isokinetic Sampling Techniques.
Choi, M. Y.; Mulholland, G. W.; Hamins, A.; Kashiwagi,
Combustion Institute/Eastern States Section. October
25-28, 1993, Princeton, NJ, 1-4 pp, 1993.
soot; optical measurement; volume fraction; sampling;
In a previous study, the performance of a three-line
optical probe technique for measuring soot volume
fraction and temperature was assessed by conducting
experiments in the path-invariant environment of a
premixed flame. In that study, the temperature and soot
volume fraction (fva, based on absorption measurements
at 632.8 nm and fve, based on emission measurements at
900 nm and 1000 nm) measurements in a premixed
ethylene/air flame were compared to the results of
Harris and Weiner. Although the temperatures and mean
soot volume fractions compared favorably, the
discrepancy between fva and fve prompted new
measurements to evaluate the importance of source
wavelength on the fva measurements, scattering by soot
particles, light absorption by 'large' molecules and the
use of different indices of refraction reported in the