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公开(公告)号：US20230071428A1
公开(公告)日：2023-03-09
申请号：US17793491
申请日：2021-01-29
申请人： Metrasens Limited
IPC分类号： G08B13/24 , G08B13/196
摘要： 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.
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公开(公告)号：US10809316B2
公开(公告)日：2020-10-20
申请号：US16169948
申请日：2018-10-24
申请人： Metrasens Limited
发明人： Mark N. Keene , Andrew M. Best , Daniel J. Becker
摘要： A security screening installation system for use in a controlled environment is described. In an embodiment, a passive detector apparatus does not produce a magnetic field for detection and relies on detecting changes in the local magnetic field. The apparatus is: (i) battery powered; (ii) light enough to be hand carried by hand and set up by one person; (iii) comprises a single elongate housing; and (iv) operable between a packed state inside a protective case and a ready to use state outside of the protective case. The housing supports at least two magnetic sensors that define a gradiometer which is arranged to produce a signal indicative of an ambient magnetic field or gradient over a zone of sensitivity which extends away from the housing, wherein a size of the zone is large enough to contain a whole body of a person.
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公开(公告)号：US10191176B2
公开(公告)日：2019-01-29
申请号：US15036745
申请日：2014-11-13
申请人： Metrasens Limited
摘要： 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.
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公开(公告)号：US11378712B2
公开(公告)日：2022-07-05
申请号：US16638868
申请日：2018-08-14
申请人： Metrasens Limited
发明人： Mark Keene , Paul A. Manning
摘要： An apparatus for detecting a moving ferromagnetic target object in a protected area comprises a first magnetic sensor adapted to measure a magnetic field within a first localised volume of space defined by a first zone of sensitivity of the first magnetic sensor and to produce a corresponding first measurement signal, and a second magnetic sensor adapted to measure a magnetic field within a second localised volume of space defined by a second zone of sensitivity of the second magnetic sensor and to produce a corresponding second measurement signal. The two magnetic sensors are separated spatially by a baseline such that the overlap between the two zones of sensitivity defines both a protected zone and a non-protected zone. A signal processing circuit is arranged in communication with the two magnetic sensors and is configured to process each of the first and second measurements signals to produce a respective first intermediate signal and a second intermediate signal which are each independent of the value of any non-changing background magnetic field that may be present in each zone of sensitivity, the value of the first and second intermediate signals thereby being dependent on the magnetic field associated with a target object moving in each zone of sensitivity. The first and second intermediate signals are proportional to the absolute change in magnetic field generated by the movement of the target object. The signal processing circuit also processes the two intermediate signals to provide an output signal that has a value that is indicative of whether the target object that caused the magnetic field is in the protected zone or in the non-protected zone.
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公开(公告)号：US20190128973A1
公开(公告)日：2019-05-02
申请号：US16169948
申请日：2018-10-24
申请人： Metrasens Limited
发明人： Mark N. Keene , Andrew M. Best , Daniel J. Becker
摘要： A method of detecting contraband about a person using a portable detector apparatus having an elongate housing that supports at least one magnetic sensor, which is 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 large enough to contain the whole body of the person, and a signal processing circuit that receives as an input the signal from the magnetic sensor and which, in response to a change in the signal, produces an alert signal includes setting up the portable detector apparatus in a chosen location, causing the person to pass alongside the housing from outside of the zone of sensitivity into the zone of sensitivity, and monitoring for the issue of an alert by the device which is indicative of the possible presence of contraband.
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公开(公告)号：US20180246063A1
公开(公告)日：2018-08-30
申请号：US15968413
申请日：2018-05-01
申请人： Metrasens Limited
摘要： 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.
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公开(公告)号：US20170167818A1
公开(公告)日：2017-06-15
申请号：US15374664
申请日：2016-12-09
申请人： Metrasens Limited
发明人： Mark Keene
CPC分类号： F41A31/00 , F41A31/02 , G01R33/0064 , G01R33/1215
摘要： A method for determining the elapsed time after discharge of a firearm is disclosed. The method utilizes the change in induced magnetization of a firearm to obtain a value for initial magnetization after discharge of the firearm. This value can then be compared with a magnetic base calibration obtainable through further testing of the magnetization over a period of time. By comparison between the initial magnetization and the base calibration, the time of discharge of the firearm can be estimated. The invention also includes apparatus for use in measuring the magnetization of a firearm, and a kit for implementation of the disclosed method.
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公开(公告)号：US11550074B2
公开(公告)日：2023-01-10
申请号：US16941942
申请日：2020-07-29
申请人： Metrasens Limited
发明人： Mark Nicholas Keene
摘要： An apparatus including two or more spaced apart ferromagnetic sensors arranged to detect and screen ferromagnetic objects, and, when a ferromagnetic object is detected, the screening is configured to be substantially independent of the sensor-object distance.
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公开(公告)号：US10109178B2
公开(公告)日：2018-10-23
申请号：US15886732
申请日：2018-02-01
申请人： Metrasens Limited
摘要： An apparatus for protecting an entrance to a protected area comprises a magnetic sensor to measure an ambient magnetic field or gradient within a first zone of sensitivity at a non-magnetic sensor means adapted to detect the presence of objects within a primary detection zone, a signal processing circuit arranged in communication with the magnetic sensor apparatus and nonmagnetic sensor apparatus, and a warning device operable by an output signal from the signal processing circuit, the warning device adapted to provide an alarm. The signal processing circuit identifies temporal variations due to the movement of a ferromagnetic object within the ambient magnetic field and correlates them with instances in which the non-magnetic sensor means detects the presence of an object in its detection zone, and causes the alarm to operate in the event that the correlation is indicative of the presence of a ferromagnetic object in the primary detection zone. It also determines the direction from which an object is approaching the using signals from the non-magnetic sensor means and modifies the operation of the warning device dependent on the direction.
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公开(公告)号：US20180158307A1
公开(公告)日：2018-06-07
申请号：US15886732
申请日：2018-02-01
申请人： Metrasens Limited
CPC分类号： G08B21/18 , G01V3/08 , G01V11/00 , G01V11/002
摘要： An apparatus for protecting an entrance to a protected area comprises a magnetic sensor to measure an ambient magnetic field or gradient within a first zone of sensitivity at a non-magnetic sensor means adapted to detect the presence of objects within a primary detection zone, a signal processing circuit arranged in communication with the magnetic sensor apparatus and nonmagnetic sensor apparatus, and a warning device operable by an output signal from the signal processing circuit, the warning device adapted to provide an alarm. The signal processing circuit identifies temporal variations due to the movement of a ferromagnetic object within the ambient magnetic field and correlates them with instances in which the non-magnetic sensor means detects the presence of an object in its detection zone, and causes the alarm to operate in the event that the correlation is indicative of the presence of a ferromagnetic object in the primary detection zone. It also determines the direction from which an object is approaching the using signals from the non-magnetic sensor means and modifies the operation of the warning device dependent on the direction.
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