Patent ID: 7307537
Filing Date: 2007-12-11
Classification: G06K

Abstract:
1. An identification chip for identification of an object, comprising an acoustic resonator ( 100 ), which exhibits a number of distinct resonant frequencies, where the combination of resonant frequencies is unique to the identification chip, thus enabling the identification chip to be identified by exposing the chip to an acoustic polling signal, measuring an acoustic response signal and analysing the frequency of the response signal, wherein the identification chip is arranged for identifying an object located in a liquid, wherein the resonator ( 100 ) comprises a cavity-forming part ( 110 , 120 ) and a membrane ( 130 ), and wherein the acoustic resonant frequencies are determined by at least one cavity ( 140 ), which is enclosed by the cavity-forming part ( 110 , 120 ) and the membrane ( 130 ), where the cavity-forming part ( 110 , 120 ) is composed of a substrate ( 110 ) with an upper surface that has at least one recess, and where the membrane's ( 130 ) lower surface is attached to the substrate's upper surface in such a manner that the at least one cavity is enclosed by the at least one recess and the membrane ( 130 ).