Abstract: A security system including a visitor/intruder register element configured to register a visitor/intruder in a detection zone and a passive ferromagnetic detection element configured to indicate a target-sized or larger ferromagnetic object in the detection zone, where the detection zone covers, or is proximate or adjacent to, an entry point of a location to be secured, and where, in use, an end-user alert element is configured to raise an alert when a visitor/intruder is registered by the visitor/intruder register element in the detection zone and a target-sized or larger ferromagnetic object is indicated by the passive ferromagnetic detection element in the detection zone.

Abstract: A security screening apparatus for use in detecting ferromagnetic objects comprises a detector apparatus which comprises a housing that supports at least one magnetic sensor arranged to produce a signal indicative of an ambient magnetic field or gradient over a zone of sensitivity which extends away from the housing, the size of the zone being large enough to contain the whole body of the person, and a signal processing circuit which receives as an input the signal from the magnetic sensor and which, in response to a change in the signal produces an alert signal. A beacon that comprises a light source is able to emit at least two visually distinct colours of light, and a control means controls the light source such that in a first condition in the absence of the alert signal the beacon emits a first colour light and in a second condition corresponding to the presence of the alert signal the beacon emits a second, different, colour of light.

Abstract: An MRI room door assembly (100) for use in protecting an entrance to a room containing an MRI scanner system. The assembly (100) comprising a doorframe (102) that is suitable to be fixed in position within or around an opening to the room, a door (103) that is fixed to the doorframe (102), and an sealing arrangement (105, 106, 107, 108) that seals the door (103) to the frame (102) when it is at rest in the closed position and which is released as a user initiates an opening of the door (103). At least one or more of the door (103) and the doorframe (102) include a built in safety system which provides a function relating to preventing ferrous objects being brought unintentionally close to the MRI scanner system.

Abstract: A security screening apparatus for use in detecting ferromagnetic objects comprises a detector apparatus which comprises a housing that supports at least one magnetic sensor arranged to produce a signal indicative of an ambient magnetic field or gradient over a zone of sensitivity which extends away from the housing, the size of the zone being large enough to contain the whole body of the person, and a signal processing circuit which receives as an input the signal from the magnetic sensor and which, in response to a change in the signal produces an alert signal. A beacon that comprises a light source is able to emit at least two visually distinct colors of light, and a control means controls the light source such that in a first condition in the absence of the alert signal the beacon emits a first color light and in a second condition corresponding to the presence of the alert signal the beacon emits a second, different, color of light.

Abstract: An MRI room door assembly for use in protecting an entrance to a room containing an MRI scanner system. The assembly comprising a doorframe that is suitable to be fixed in position within or around an opening to the room, a door that is fixed to the doorframe, and an sealing arrangement that seals the door to the frame when it is at rest in the closed position and which is released as a user initiates an opening of the door. At least one or more of the door and the doorframe include a built in safety system which provides a function relating to preventing ferrous objects being brought unintentionally close to the MRI scanner system.

Abstract: A security screening apparatus for use in detecting ferromagnetic objects comprises a detector apparatus which comprises a housing that supports at least one magnetic sensor arranged to produce a signal indicative of an ambient magnetic field or gradient over a zone of sensitivity which extends away from the housing, the size of the zone being large enough to contain the whole body of the person, and a signal processing circuit which receives as an input the signal from the magnetic sensor and which, in response to a change in the signal produces an alert signal. A beacon that comprises a light source is able to emit at least two visually distinct colours of light, and a control means controls the light source such that in a first condition in the absence of the alert signal the beacon emits a first colour light and in a second condition corresponding to the presence of the alert signal the beacon emits a second, different, colour of light.

Abstract: An apparatus for detecting a ferromagnetic object located on or in a person being screened includes a first magnetic sensor which measures an ambient magnetic field or gradient within a first volume of space and produces a corresponding measurement signal, a primary power supply provides power to the magnetic sensor, a signal processing circuit is in communication with the magnetic sensors identifies temporal variations in the measurement signal and from the identified temporal variations provides an output signal indicative of the presence of a ferromagnetic object within the volume of space, and a warning device operable by the output from the signal processing circuit provides in the vicinity of the apparatus an audible and a visible warning in response to the output signal from the signal processing circuit. The apparatus may include a user operable input means that disables the warning device without powering down the magnetic sensors.

Abstract: Apparatus for detecting a ferromagnetic object located on or in a person being screened comprises a first magnetic sensor which in use measures an ambient magnetic field or gradient within a first volume of space and produces a corresponding measurement signal, a primary power supply which provides power to the magnetic sensor, a signal processing circuit arranged in communication with the magnetic sensors configured to identify temporal variations in the measurement signal and from the identified temporal variations provide an output signal indicative of the presence of a ferromagnetic object within the volume of space, and a warning device operable by the output from the signal processing circuit to provide within the vicinity the apparatus at least one of an audible and a visible warning in response to the output signal from the signal processing circuit. The apparatus include a user operable input means which enables the warning device to be disabled by a user without powering down the magnetic sensors.

Abstract: A security screening apparatus for use in detecting ferromagnetic objects comprises a detector apparatus which comprises a housing that supports at least one magnetic sensor arranged to produce a signal indicative of an ambient magnetic field or gradient over a zone of sensitivity which extends away from the housing, the size of the zone being large enough to contain the whole body of the person, and a signal processing circuit which receives as an input the signal from the magnetic sensor and which, in response to a change in the signal produces an alert signal. A beacon that comprises a light source is able to emit at least two visually distinct colours of light, and a control means controls the light source such that in a first condition in the absence of the alert signal the beacon emits a first colour light and in a second condition corresponding to the presence of the alert signal the beacon emits a second, different, colour of light.

Abstract: An MRI room door assembly (100) for use in protecting an entrance to a room containing an MRI scanner system. The assembly (100) comprising a doorframe (102) that is suitable to be fixed in position within or around an opening to the room, a door (103) that is fixed to the doorframe (102), and an sealing arrangement (105, 106, 107, 8) that seals the door (103) to the frame (102) when it is at rest in the closed position and which is released as a user initiates an opening of the door (103). At least one or more of the door (103) and the doorframe (102) include a built in safety system which provides a function relating to preventing ferrous objects being brought unintentionally close to the MRI scanner system.

Abstract: Apparatus for detecting a ferromagnetic object located on or in a person being screened comprises a first magnetic sensor which in use measures an ambient magnetic field or gradient within a first volume of space and produces a corresponding measurement signal, a primary power supply which provides power to the magnetic sensor, a signal processing circuit arranged in communication with the magnetic sensors configured to identify temporal variations in the measurement signal and from the identified temporal variations provide an output signal indicative of the presence of a ferromagnetic object within the volume of space, and a warning device operable by the output from the signal processing circuit to provide within the vicinity the apparatus at least one of an audible and a visible warning in response to the output signal from the signal processing circuit. The apparatus include a user operable input means which enables the warning device to be disabled by a user without powering down the magnetic sensors.

Abstract: A superconductive junction (10) comprises a first track (22) of YBa.sub.2 Cu.sub.3 O.sub.7 surmounted by a second track (28) also of YBa.sub.2 Cu.sub.3 O.sub.7. An interconnect (26) in the form of a superconductive mesa electrically connects the first track to the second track and acts as a microbridge. When cooled below a critical temperature, the junction (10) shows Josephson-like behaviour. A non-superconductive layer (24) of PrBa.sub.2 Cu.sub.3 O.sub.7 separates the first track and the second track, with the interconnect extending through the PrBa.sub.2 Cu.sub.3 O.sub.7 layer in the form of an island. The junction (10) is fabricated by electron beam evaporation, optical lithography, and ion beam milling.