Patent attributes
A tape seal includes electronic circuitry to detect tamper- and manipulation events relating to sealed items in various embodiments. A complex impedance is formed in a continuous seal. The seal is designed in such a way, that any attempt to break or remove the seal results in a change of the complex impedance. An electronic module in connection with the seal quantifies a complex impedance, and when a change is detected above a programmed threshold, this is treated as a tamper event. In one embodiment, the inclusion of reference impedances are applied to allow a more precise detection of a tamper event and allow for automatic calibration of natural variations of the complex impedance. In a further embodiment, a method of determining tampering with a sealed item is disclosed.
