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公开(公告)号：US11779250B2
公开(公告)日：2023-10-10
申请号：US17328315
申请日：2021-05-24
申请人： HI LLC
IPC分类号： A61B5/243 , A61B5/00 , G01R33/02 , G01R33/421
CPC分类号： A61B5/243 , A61B5/0046 , A61B5/6805 , G01R33/02 , G01R33/4215 , A61B2562/0223
摘要： A magnetocardiography (MCG) system includes a passively shielded enclosure having walls defining the passively shielded enclosure, each of the walls including passive magnetic shielding material to reduce an ambient background magnetic field within the passively shielded enclosure; an MCG measurement device including optically pumped magnetometers (OPMs); and active shield coils within the passively shielded enclosure and stationary relative to the passively shielded enclosure and the MCG measurement device, wherein the active shield coils are configured to further reduce the ambient background magnetic field within a user area of the passively shielded enclosure.
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2.发明授权公开(公告)号：US11262420B2
公开(公告)日：2022-03-01
申请号：US16418500
申请日：2019-05-21
申请人： HI LLC
IPC分类号： G01R33/032
摘要： A magnetometer can include a single, integrated, unitary structure that has a gas cell defining a cavity having a vapor or vaporizable material disposed therein, a collimating element coupled to the gas cell and configured for collimating light directed toward the gas cell, and a lens element coupled the gas cell and configured for redirecting at least a portion of light that has passed through the gas cell. Additionally or alternatively, a gas cell of a magnetometer may be made of sapphire.
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公开(公告)号：US11766217B2
公开(公告)日：2023-09-26
申请号：US17328271
申请日：2021-05-24
申请人： HI LLC
CPC分类号： A61B5/6803 , A61B5/246 , G01R33/26 , A61B2562/0223
摘要： A magnetic field recording system includes a headgear to be placed on a user; optically pumped magnetometers (OPMs) disposed in or on the headgear to detect magnetic fields; at least two sensing modalities selected from the following: i) a magnetic sensing modality, ii) an optical sensing modality, or iii) an inertial sensing modality; and a tracking unit configured to receive, from each of the at least two sensing modalities, a corresponding magnetic data stream, optical data stream, or inertial data stream and to track a position or orientation of the headgear or user; and a system controller configured to control operation of the OPMs and to receive, from the tracking unit, the position or orientation of the headgear or user.
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公开(公告)号：US20210369201A1
公开(公告)日：2021-12-02
申请号：US17328271
申请日：2021-05-24
申请人： HI LLC
摘要： A magnetic field recording system includes a headgear to be placed on a user; optically pumped magnetometers (OPMs) disposed in or on the headgear to detect magnetic fields; at least two sensing modalities selected from the following: i) a magnetic sensing modality, ii) an optical sensing modality, or iii) an inertial sensing modality; and a tracking unit configured to receive, from each of the at least two sensing modalities, a corresponding magnetic data stream, optical data stream, or inertial data stream and to track a position or orientation of the headgear or user; and a system controller configured to control operation of the OPMs and to receive, from the tracking unit, the position or orientation of the headgear or user.
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5.发明申请公开(公告)号：US20210239772A1
公开(公告)日：2021-08-05
申请号：US17235213
申请日：2021-04-20
申请人： HI LLC
IPC分类号： G01R33/032 , G01R33/028 , G01R33/32 , G01N24/00 , G01R33/025 , G01R33/00
摘要： One embodiment is a magnetic field measurement system that includes at least one magnetometer having a vapor cell, a light source to direct light through the vapor cell, and a detector to receive light directed through the vapor cell; at least one magnetic field generator disposed adjacent the vapor cell; and a feedback circuit coupled to the at least one magnetic field generator and the detector of the at least one magnetometer. The feedback circuit includes at least one feedback loop that includes a first low pass filter with a first cutoff frequency. The feedback circuit is configured to compensate for magnetic field variations having a frequency lower than the first cutoff frequency. The first low pass filter rejects magnetic field variations having a frequency higher than the first cutoff frequency and provides the rejected magnetic field variations for measurement as an output of the feedback circuit.
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公开(公告)号：US20210369165A1
公开(公告)日：2021-12-02
申请号：US17328315
申请日：2021-05-24
申请人： HI LLC
IPC分类号： A61B5/243 , A61B5/00 , G01R33/02 , G01R33/421
摘要： A magnetocardiography (MCG) system includes a passively shielded enclosure having walls defining the passively shielded enclosure, each of the walls including passive magnetic shielding material to reduce an ambient background magnetic field within the passively shielded enclosure; an MCG measurement device including optically pumped magnetometers (OPMs); and active shield coils within the passively shielded enclosure and stationary relative to the passively shielded enclosure and the MCG measurement device, wherein the active shield coils are configured to further reduce the ambient background magnetic field within a user area of the passively shielded enclosure.
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公开(公告)号：US20210247468A1
公开(公告)日：2021-08-12
申请号：US17160179
申请日：2021-01-27
申请人： HI LLC
IPC分类号： G01R33/02 , G01R33/565 , G01R33/56 , A61B5/245
摘要： Measurements of an arbitrary magnetic field having one or more magnetic field components are acquired from a plurality of magnetometers, and a generic model of at least one of the one or more magnetic field components of the arbitrary magnetic field is generated in the vicinity of the magnetometers. The generic magnetic field model comprises an initial number of different basis functions. Maxwell's equations are applied to the generic magnetic field model to reduce the initial number of different basis functions, thereby yielding a Maxwell-constrained model of the magnetic field component(s) of the arbitrary magnetic field, and the magnetic field component(s) of the arbitrary magnetic field are estimated at each of at least one of the magnetometers based on the constrained magnetic field model and the arbitrary magnetic field measurements acquired from each magnetometer.
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公开(公告)号：US10983177B2
公开(公告)日：2021-04-20
申请号：US16457655
申请日：2019-06-28
申请人： HI LLC
IPC分类号： G01N27/72 , G01R33/00 , G01R33/032 , G01R33/07 , G01R33/02 , G01R33/025 , G01R33/09
摘要： A magnetic field measurement system includes at least one magnetometer; and at least one flux concentrator made of a high magnetic permeability material and configured to receive magnetic field signals from a source, to concentrate the magnetic field signals or reorient the magnetic field signals in a preselected direction, and to direct the concentrated or reoriented magnetic field signals toward at least one of the at least one magnetometer. In addition to, or as an alternative to, the flux concentrator, the system can include a passive shield made of the high magnetic permeability material. The system may also include active shielding.
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公开(公告)号：US20210080522A1
公开(公告)日：2021-03-18
申请号：US17105338
申请日：2020-11-25
申请人： HI LLC
IPC分类号： G01R33/26
摘要： A magnetic field measurement system that includes at least one magnetometer; at least one magnetic field generator; a processor coupled to the at least one magnetometer and the at least one magnetic field generator and configured to: measure an ambient background magnetic field using at least one of the at least one magnetometer in a first mode selected from a scalar mode or a vector mode; generate, in response to the measurement of the ambient background magnetic field, a compensation field using the at least one magnetic field generator; and measure a target magnetic field using at least one of the at least one magnetometer in a spin exchange relaxation free (SERF) mode which is different from the first mode.
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10.发明授权公开(公告)号：US11428756B2
公开(公告)日：2022-08-30
申请号：US17328290
申请日：2021-05-24
申请人： HI LLC
摘要： A magnetic field recording system includes a headgear for a user; optically pumped magnetometers (OPMs) disposed in or on the headgear to detect magnetic fields and, in response to the detection, produce magnetic field data; at least one sensing modality including an optical sensing modality having at least one light source and at least one camera or light detector to receive light reflected or directed from the user and to produce an optical data stream; a tracking unit to receive the optical data stream and track a position or orientation of the headgear or user; a system controller to control operation of the OPMs and receive, from the tracking unit, the position or orientation of the headgear or user; and a processor to receive the optical data stream and the magnetic field data from the OPMs and analyze the magnetic field data using the optical data stream for validation.
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