Monte-Carlo calculations are carried out to simulate the light transport in dense materials. Focus lies on the calculation of diffuse light transmission through films of scattering and absorbing media considering additionally the effect of dependent scattering. Different influences like interaction type between particles, particle size, composition etc. can be studied by this program. Simulations in this study show major influences on the diffuse transmission. Further simulations are carried out to model a sunscreen film and study best compositions of this film and will be presented.
Photon Density Wave (PDW) spectroscopy is introduced as a fiber-optical technique for the in-line and dilution-free determination of the droplet or particle size in highly turbid emulsions and suspensions, respectively. Here, focus is laid on the monitoring of the Phase Inversion Temperature (PIT) emulsification process. The different stages like the inversion from an oil-in-water to a water-in-oil macroemulsion and finally to an oil-in-water nanoemulsion are observed and the droplet size is determined with high temporal resolution. This process shows the capability of PDW spectroscopy to determine particle or droplet sizes over a wide range from the nanometer to micrometer scale.
A key parameter for the monitoring of emulsification processes is the droplet size of the dispersed material. Due to
relatively high concentrations of the droplets in technical applications and their micrometer size these emulsions exhibit
strong light scattering. Photon Density Wave (PDW) spectroscopy is an innovative fiber-optical in-line technique for
precise determination of the optical absorption and scattering properties of such highly turbid samples. From the light
scattering properties (specifically the reduced scattering coefficient) mean droplet sizes can be quantified with a temporal
resolution on the minute-timescale. Investigation of the influence of emulsifier concentration and stirring speed on the
emulsification process demonstrate the excellent performance of PDW spectroscopy for fiber-optical in-line sensing
under these demanding spectroscopic conditions.
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