摘要 |
The invention relates to methods for the remote identification of objects that are to be protected against theft. A passive responder using a shear acoustic wave delay line (105) is embedded in a cement (104) inside a cavity (102) provided in the object to be protected (101). The action of the cement on the line modifies at random the response of the line. The shape of the cavity prevents the removal of the responder without breaking the cement and therefore without modifying the signature of the responder. It allows to protect collections in a museum. |