Pseudo transmission measurement concept for the volume fraction determination of rice in a pneumatic conveying system

In this contribution, a measurement concept for the volume fraction determination of pneumatic conveyed rice, named pseudo transmission measurement, is presented. The theoretical background of the pseudo transmission measurement as well as an adequate permittivity mixing equation is discussed in detail. Due to the essential knowledge of the rice´s permittivity for the mixing equation, a waveguide cut-off frequency measurement for bulked materials is introduced. Because the pseudo transmission measurement is based on a cross polarization effect, a transpolarizing reflector is introduced and simulation results are presented. Additionally the pseudo transmission measurement is performed and evaluated on various amounts of dispersed rice inside a borosilicate glass tube.