APPARATUS AND METHOD FOR MICROWAVE DETERMINATION OF AT LEAST ONE PHYSICAL PARAMETER OF A SUBSTANCE

摘要

A method and an apparatus is described to measure at least one physical parameter of a substance such as moisture and salt content. This is done by transmitting a microwave beam through the material to be measured and detect only a reflection of a predetermined polarity of the transmitted waves. To accomplish this a polarising plate is used so that only cross-polarised microwaves, which pass through the substance are detected and the co-polar reflections from surrounding structures are excluded. The object can either be moving as on a conveyer belt or in a rest position.