Raphael Mansmann

University of Duisburg-Essen | uni-due · Institut für Verbrennung und Gasdynamik

Time-resolved laser-induced incandescence is used to infer the size distribution of gas-borne nanoparticles from time-resolved pyrometric measurements of the particle temperature after pulsed laser heating. The method is highly sensitive to aspects of the measurement strategy that are often not considered by practitioners, which often lead to discr...

Evaluation of measurement data for laser-induced incandescence (LII) is a complex process, which involves many processing steps starting with import of data in various formats from the oscilloscope, signal processing for converting the raw signals to calibrated signals, application of models for spectroscopy/heat transfer and finally visualization,...

Photomultiplier tubes (PMTs) are widely used as detectors for laser-induced incandescence (LII), a diagnostics method for gas-borne particles that requires signal detection over a large dynamic range with nanosecond time resolution around the signal peak. Especially when more than one PMT is used (i.e., for pyrometric temperature measurements) even...

A new method for collecting time-resolved laser-induced incandescence (TiRe-LII) signals with high dynamic range is presented. Gated photomultiplier tubes (PMT) are used to detect temporal sections of the LII signal. This helps to overcome the limitations of PMTs caused by restricted maximum signal current at the strong initial signal and poor sign...

In many time-resolved laser-induced incandescence (TiRe-LII) experiments, it is common practice to relate the intensity emitted by laser-heated nanoparticles to the detected LII signal through a factor (here called the intensity scaling factor, ISF) that includes the particle volume fraction and other parameters that may not be the focus of the ana...

This paper presents measurements of spectrally and temporally resolved laser-induced incandescence (LII) signals from an ethylene laminar coflow diffusion flame using excitation wavelengths of 1064 and 532 nm for a fluence range of 0.1-10.0 mJ/mm 2. Measurements were performed at four positions in the flame to infer how soot maturity influences the...

This paper examines the method be calculating temperatures and scaling factor, which is related to the volume fraction, from time-resolved laser-induced incandescence data on in-flame soot. A Bayesian analysis is used to estimate the probability densities for these variables, and to introduce prior information into the procedure in order to narrow...

Interpreting laser-induced incandescence (LII) measurements on aerosolized nanoparticles requires a spectroscopic model that relates the measured spectral incandescence to the temperature of the nanoparticles. We present spectroscopic models for molten silicon and copper nanoparticles, which are evaluated through extinction and incandescence measur...

Interpreting laser-induced incandescence (LII) measurements on synthetic nanoaerosols requires a spectroscopic model that relates spectral incandescence to the temperature of the laser energized nanoparticles. We present models for molten silicon and copper nanoparticles, which are evaluated through extinction and incandescence measurements on nano...

Particle sizes of silicon nanoparticles were determined by laser-induced incandescence measurements within a microwave-plasma reactor. Literature data of the silicon vapor pressure are compared and analyzed for the suitability towards modeling LII temperature decay curves.

This paper describes the application of time-resolved laser-induced incandescence (TiRe-LII), a combustion diagnostic used mainly for measuring soot primary particles, to size silicon nanoparticles formed within a plasma reactor. Inferring nanoparticle sizes from TiRe-LII data requires knowledge of the heat transfer through which the laser-heated n...