In critical areas of high-performance technology or medical technology, all particles, including transparent or light particles, are often relevant. Bright or transparent organic particles cannot be detected in the light microscope, organic particles are not lifted off the organic filter material in the scanning electron microscope, scattered light methods have been used to date, but use approximations and are not imaging methods.
Metallized filters offer a number of unique advantages that are not available with traditional filters. In the scanning electron microscope there is a material contrast to all organic particles.
Optical methods can be used for light microscopy and FTIR spectroscopy to obtain better contrast on particles. In FTIR in particular, the surface of the metal filter makes reflection measurements possible, which, in contrast to ATR technology, can be carried out automatically, which means that organic particles can be measured cost-effectively.
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