Abstract: A ferromagnetic resonator for use in a marker in a magnetomechanical electronic article surveillance system is manufactured at reduced cost by being continuously annealed with a tensile stress applied along the ribbon axis and by providing an amorphous magnetic alloy containing iron, cobalt and nickel and in which the portion of cobalt is less than about 4 at %.

Abstract: A ferromagnetic resonator for use in a marker in a magnetomechanical electronic article surveillance system is manufactured at reduced cost by being continuously annealed with a tensile stress applied along the ribbon axis and by providing an amorphous magnetic alloy containing iron, cobalt and nickel and in which the portion of cobalt is less than about 4 at %.

Abstract: A ferromagnetic resonator for use in a marker in a magnetomechanical electronic article surveillance system is manufactured at reduced cost by being continuously annealed with a tensile stress applied along the ribbon axis and by providing an amorphous magnetic alloy containing iron, cobalt and nickel and in which the portion of cobalt is less than about 4 at %.

Abstract: The invention is directed to a security element for the electronic surveillance of articles. This security element is detected by surveillance systems operating in different frequency ranges and it includes at least two materials of high permeability which, when excited by an external alternating magnetic field emit each a characteristic signal. The maximum signal components of the two materials lie in different frequency ranges and the signal components of the one material are negligibly ow in that particular frequency range in which the signal component of the other material is at a maximum level. The invention also relates to surveillance systems that incorporate these security elements.

Abstract: A ferromagnetic resonator for use in a marker in a magnetomechanical electronic article surveillance system is manufactured at reduced cost by being continuously annealed with a tensile stress applied along the ribbon axis and by providing an amorphous magnetic alloy containing iron, cobalt and nickel and in which the portion of cobalt is less than about 4 at %.

Abstract: A surveillance camera assembly housing is releasably locked to a base for the housing. The base is installed on a ceiling or at another location remote from ground level. A removal tool head, in the form of a hollow cylinder, is provided at the end of a pole. Slots formed in the tool head engage ridges on the camera assembly housing. The assembly housing is twisted to release it from the base and then is brought to ground level while contained within the tool head.

Abstract: Wavelet transform processing is performed on an input signal received at a receiver circuit of an electronic article surveillance (EAS) system. The input signal includes a target signal generated by an EAS marker and also includes correlated high amplitude interference signals. The wavelet transform processing is performed so as to generate from the input signal plural wavelet transform signals having mutually different phases. The wavelet transform is substantially phase invariant with respect to the interference signals and lacks phase invariance with respect to the target signal. Uncorrelated components of the plural phase-diverse wavelet transform signals are identified to detect the target signal.

Abstract: An inventory of goods is protected from theft by means of electronic article surveillance (EAS) markers integrated with items of the inventory. Each such item has a structural member in which a cavity is integrally formed. A respective magnetostrictive element is housed, free of mechanically clamping constraint, in each cavity. A respective biasing element is located adjacent to the cavity on each such item of inventory. The biasing element provides a magnetic field to bias the respective magnetostrictive element. EAS equipment is provided at a retail store where the inventory is maintained. The EAS equipment generates an alternating electromagnetic interrogation field, and when an item of inventory having the integrated EAS marker is exposed to the interrogation field, the biased magnetostrictive element is excited into mechanical resonance that is detected by the EAS equipment.

Abstract: A marker for use in an electronic article surveillance system in which the marker comprises a magnetically soft component and exhibits a pinned wall hysteresis characteristic with a step change in flux at a threshold value of applied field and in which the marker further comprises a magnetically hard or semi-hard component integral with the soft component and whose magnetic state can be switched between activating and deactivating states to switch the marker between active and deactive states.