Line-of-sight-attenuation (LOSA) is a well-established soot diagnostic valuable for soot volume fraction [1] and the method of laser-induced incandescence (LII) has become a common way for in-situ particle-size measurements and visualization of particle volume fractions in a wide range of applications [2]. In this work a co-annular burner was used to produce a laminar ethylene/air nonpremixed flame at the standard Gülder conditions. For the LOSA measurements, a tungsten strip lamp (450-1000 nm) was used as light source. The transmission and emission signal of the flame were both detected with a spectrometer (Jarell-Ash Monospec 18), configured to measure in the wavelength range of 450-900 nm and a CCD camera (Princeton Instrument-Spectrum MM System) with a spectral resolution of 6.7 nm per pixel on the detector plane.