Characterization of shape and state of agglomeration of disperse systems by a 3D Light Scattering Sensor

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In the course of a cluster project (MPaC) a 3D Light Scattering Sensor (3D-LSS) for aerosols is currently developed at University of Kaiserslautern. Recent investigations are focused on particles with a size range of 500-1500 nm. By measuring the three dimensional light scattering distribution of a single particle, which passes a laser beam, information not only about the size, but also about the structure of the particle can be obtained. Therefore, the particle traverses a spherical measurement chamber. On the inside wall of this chamber, scattering intensities can be determined at up to 16 different positions. By using suitable algorithms for data processing, it is possible to gain information about the particle size and shape almost online.During the continuation project, three major goals are to be attained. One focus will be set on the further development of the 3D-LSS sensor for characterization of irregularly shaped, realistic particle systems. First, possibilities for combination of the 3D-LSS sensor with sensor systems developed inside the MPaC cluster will be examined regarding the future applications at the plants of industrial partners. Furthermore, the developed sensor system will be modified for the mobile application by industrial and project partners. The robustness of the complete system for such kind of applications will be tested. Moreover, the theoretical and experimental analysis of the particle motion inside the open jet of the aerodynamic focusing, which is part of the sensor system, has to be performed. With the help of correlations between particle motion and the resulting light scattering intensities, knowledge can be gained that leads to a three dimensional detection of complex particle structures, such as soot, pyrogenic silicon dioxide or other desublimated particles. At the end of the project, measurements will be carried out by the industrial partners and results will be compared with measurements of the project partners.