Magnetic Resonance (NMR, MRT)
Nuclear magnetic resonance (NMR) is a measurement procedure, which directly measures the magnetic characteristics of atomic nuclei. This requires a sample to be induced by a high-frequent alternating field in a static external magnetic field. For this purpose, the magnetic moments of the atomic nuclei absorb energy, which they emit again in the form of electromagnetic radiation during relaxation into their original state. This is characteristic for the respective atomic nucleus and can be measured in a radiofrequency coil as an electric signal. The hydrogen nucleus is the most sensitive nucleus for NMR measurements. Aside from sole NMR spectroscopy, spatially-resolved measurements can be conducted, such as magnetic resonance tomography (MRT).
In the field of non-destructive testing (NDT) of plastics, important parameters can be identified using NMR:
- Structure, pore size and pore distribution
- Molecule chain movement
- Density, connectivity, crystallinity
- Flow behavior, viscosity
- Water content and distribution
- Swelling behavior
In this field, the SKZ is cooperating closely with the Fraunhofer Institute for Integrated Circuits IIS.