Design and Application of Microwave Detection & Rejection System in Filter Combiner

The existing photoelectric detection system in filter combiner is insensitive to minor filter material signals,the filter rod quality cannot be effectively guaranteed. Therefore,a microwave detection & rejection system was designed,which was composed mainly of microwave signal generator,resonant cavity,probe coupler,microwave signal detector,digital signal processor. By detecting the density of combined filter rod,the material in each filter segment was identified from which to determine whether the filter segments were rightly spaced and symmetrically positioned. The results of application showed that the system realized the online detection of the deviations of filter segment clearance and symmetry in combined filter rod. The combined filter rod with defects of symmetry >1 mm or clearance >0.3 mm would be accurately rejected,and the rejection error was controlled within 0.03%.