Measurement of light extinction constant of JP-8 soot in the visible and near-infrared spectrum

The dimensionless extinction constant, Ke, was measured using the NIST large agglomerate optics facility (LAOF) for soot produced from JP-8 flames. Measurements were performed using light sources ranging from 632.8 to 1565 nm. These experiments represent the first measurement of dimensionless extinction constant for soot produced from JP-8 flames. The Ke values did not display significant spectral variations that were observed for pure fuels such as acetylene and ethene. The measured Ke values ranged from 9.75 to 9.95 in the wavelength range between 632.8 and 1565 nm. Measurements provide a more reliable value of Ke for use in optical-based soot diagnostics for soot concentration and temperature measurement as well as for soot radiation analysis.