MOISTURE MEASUREMENT

摘要

An electromagnetic field tuning and detection apparatus (102, 212, 214) generates in to a material space (400) and in at least two different directions radio frequency electromagnetic fields adapted to resonate in different directions at a different frequency on the basis of a material (500) insertable into the material space (400); and a signal processing unit (104) configured to determine a moisture content of the material (500) on the basis of a resonance frequency of each electromagnetic field and quality of each resonance in different directions. While controlling a process, a control system comprises a measurement chamber (100) and an electromagnetic field tuning and detection apparatus (102) placed on each material feed line of the process. A controller may control the process on the basis of each determined moisture content on each feed line.