Volume fraction determination in pneumatic conveying systems by means of the pseudo transmission measurement concept using a transpolarizing reflector

In this contribution a measurement concept, named pseudo transmission method, is presented. It aimes at volume fraction determination in multi phase flows which is a relevant physical quantity for the mass flow determination in latter systems. Fundamentals concerning the material composition as well as necessary mixing equations for effective permittivities are investigated, discussed and adopted to the pseudo transmission measurement concept. In addition a transpolarizing reflector, which is essential for the pseudo transmission measurement method is discussed and evaluated in electromagnetic simulations. The proposed monitoring concept is validated in various electromagnetic field simulations. Finally, measurements that were performed with a calibrated vector network analyzer on plastic phantoms inserted into a glass tube are presented and discussed in detail.