Wireless Sensing for Monitoring of Coal Gangue Mixing Based on PT Symmetry

The challenge in using fully mechanized caving mining technology for thick coal seam is monitoring the mixing ratio of gangue during top process. In this paper, we propose a passive wireless sensing system based on second-order parity-time symmetric operated around exceptional point mixing, which has an LC resonance structure consisting spiral resonant coil and parallel-plate capacitor at end system. parallel was designed as sampling platform. When different proportions mixture are placed it, capacitance value changes, changing frequency Our results indicated that could clearly distinguish degree higher sensitivity than conventional proposed compared with mosquito same order, more significant advantages enhancement sensitivity. This provides accurate method automatic identification process; furthermore, it inexpensive highly operable.