FRITSCH technology: Simple measurement of backward scattering

For detecting particles with a diameter of less than 100 nm, it is necessary to measure the backward scattered light (scattering angle greater than 90°). For this purpose, the detectors were specially positioned close to the measuring cell in the ANALYSETTE 22 NeXT Nano. A laser with green light that is also used simultaneously for measuring forward and sideward scattering is used as a light source. Particular attention was placed in the design of the backward detectors on the suppression of undesirable signal components, caused, for example, by reflection on the measuring cell glasses.