Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.v.

Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.v.

Michael Maskos

Ines Frese

Peter Höbel

A method for detecting Raman scattered light using at least one interference filter and a detection unit, the Raman scattered light to be detected including an incoming scattered light signal, wherein the method includes the following steps: * a first filtered scattered light signal is generated by the application of a first transmission function to the incoming scattered light signal, the first transmission function being assigned to a first optical path length Lthrough a first interference filter, and the first transmission function defining a first spectral band δλ; * a second filtered scattered light signal is generated by the application of a second transmission function to the incoming scattered light signal, the second transmission function being assigned to a second optical path length L≠Lthrough the first interference filter or through a second interference filter, and second transmission function defining a second spectral band δλ; and * the first and the second filtered scattered light signals are detected by the detection unit.

Method, device and system for detecting raman scattered light

In determining the size of particles in a flowing sample, initially scattered light is detected on a detector, in the form of images, standardization of the measured images takes place and determination of an offset and of an angle of rotation at least of a partial region of two temporally successive images relative to each other is effected. Two images congruent are subdivided into many partial areas with respectively a specific number of pixels and averaging of the brightness values of each individual partial area is implemented. Subsequently, the average brightness value of a partial area of the first image is correlated with the average brightness value of the partial area made congruent with this partial area in the second image (cross-correlation between the images). For each pair of congruent partial areas of the images, a correlation value is thereby produced.

Method for determining the average particle size of particles which are suspended in a liquid and flowing medium, by means of dynamic light scattering, and a device therefore

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Bodenheim, Germany

Michael Maskos