Thermal impedance spectroscopy (3Omega Method)
Fraunhofer IPM develops robust and temperature-stable sensor technology in microsystems technology for measurements at temperatures up to 250 °C. This technology is suitable for industrial applications. High-performance online diagnostic systems detect unwanted contaminations or films on surfaces in chemical plants and reactors, known as »fouling«, at an early stage. These measurements are based on the »3Omega method«, which has not been applied in this context before. The »3Omega method« is based on the interpretation of a thermal signal and enables the determination of other temperature dependent process parameters such as heat flow, density, thermal conductivity and capacity. The »3Omega method« turns out to be a highly powerful tool for process monitoring. Currently, the method is tested in chemical, pharmaceutical and biotechnological applications. Due to the universal suitability of the method, future applications in the cosmetics and food industry, for example in pasteurization and HTST (»High Temperature Short Time«) plants, are also conceivable.