Method for bulk detection of reusable drink barrels, involves arranging on-metal transponders centrally and transversely to longitudinal direction of slot in grip ring

摘要

The method involves arranging drink barrel parallel to an outer edge of grip ring. A slot is formed in the grip ring and the wavelength of the slot is set half of the wavelength of an on-metal transponder with specific deviation. The width of the slot is set smaller than the length of the slot. The on-metal transponders are arranged centrally and transversely to the longitudinal direction of the slot in grip ring. The transponders with frequency range from 868MHZ to 915MHZ are provided.