Meaning
Non-destructive testing methods utilize electromagnetic fields to measure the physical properties of materials by monitoring frequency shifts. Using dielectric resonance sensing allows for the measurement of moisture, density or thickness without physical contact with the product. The technology relies on the way a material interacts with a microwave field inside a resonant cavity.
It is often used in high-speed production lines for paper, textiles or chemicals.
Resonance Shift
Materials placed within the sensor field alter the resonant frequency and the quality factor of the signal. In dielectric resonance sensing, these changes are mathematically linked to the dielectric constant of the substance being measured. Water has a very high dielectric constant, making it easy to detect even in small quantities.
Material Characterization
Calibration of the system requires a baseline for the specific material being tested. Dielectric resonance sensing provides a volume-averaged measurement rather than a surface reading, which offers a more accurate view of bulk properties. This makes it suitable for measuring grain, powders or thick sheets.
Inline Data
High measurement speeds allow for real-time adjustments to the production process. Integrating dielectric resonance sensing into the control loop can reduce waste by identifying out-of-specification material immediately. This capability supports high-throughput manufacturing where manual sampling is too slow to be effective.
