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公开(公告)号：US11803018B2
公开(公告)日：2023-10-31
申请号：US17572404
申请日：2022-01-10
申请人： HI LLC
发明人： Argyrios Dellis , Ethan Pratt , Dakota Blue Decker , Kayla Wright-Freeman , Micah Ledbetter , Geoffrey Iwata
CPC分类号： G02B6/4226 , G02B6/32 , G02B6/4206 , H02N2/04
摘要： A light intensity modulator includes an input optical fiber; an output optical fiber; an optical arrangement having a lens, where the optical arrangement is configured to receive light from the input optical fiber, pass the light through the lens, and direct the light to the output optical fiber; and a piezoelectric device coupled to the lens, where the piezoelectric device is configured for moving the lens to alter overlap of the output optical fiber and the light directed to the output optical fiber to modulate intensity of light in the output optical fiber.
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2.发明授权公开(公告)号：US11525869B2
公开(公告)日：2022-12-13
申请号：US17458111
申请日：2021-08-26
申请人： HI LLC
发明人： Stephen Garber , Jamu Alford , Michael Henninger , Jeffery Kang Gormley , Dakota Blue Decker , Scott Michael Homan , Teague Lasser , Micah Ledbetter , Jerry Leung , Hooman Mohseni , Ethan Pratt , Scott Jeremy Seidman , Benjamin Siepser
IPC分类号： G01R33/00 , G01R33/032 , G01R33/26 , G01R33/09 , H01F7/20 , H01F27/28 , H01F27/36 , H05K1/18 , A61B5/05 , A61B5/00 , A61B5/245
摘要： An exemplary magnetic field measurement system includes a wearable sensor unit that includes a magnetometer and a twisted pair cable interface assembly electrically connected to the magnetometer.
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3.发明申请公开(公告)号：US20220299584A1
公开(公告)日：2022-09-22
申请号：US17689669
申请日：2022-03-08
申请人： HI LLC
摘要： A magnetic field measurement system includes a light source that emits a light beam; an optical fiber to transmit the light beam; a variable optical attenuator to increase stability of an intensity of the light beam; a beam splitter to divide the light beam into an OPM light beam and a monitor light beam; a monitor detector to detect the monitor light beam and generate a monitor signal; a vapor cell with alkali metal atoms disposed therein and configured for transmission of the OPM light beam through the vapor cell; an OPM detector to detect the OPM light beam after transmission through the vapor cell and generate an OPM signal; and a group delay filter to combine the monitor signal and the OPM signal to generate a reduced noise OPM signal, where the group delay filter accounts for a phase difference between the monitor signal and the OPM signal.
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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：US20200350106A1
公开(公告)日：2020-11-05
申请号：US16862919
申请日：2020-04-30
申请人： HI LLC
发明人： Jamu Alford , Michael Henninger , Dakota Blue Decker , Stephen Garber , Jeffery Kang Gormley , Scott Michael Homan , Teague Lasser , Micah Ledbetter , Jerry Leung , Hooman Mohseni , Ethan Pratt , Scott Jeremy Seidman , Benjamin Siepser
摘要： A magnetic field generator includes a plurality of conductive windings comprising a first conductive winding arranged in a first plane and a second conductive winding arranged in a second plane that is substantially parallel to the first plane. The plurality of conductive windings are configured to generate, when supplied with a drive current, a first component of a compensation magnetic field. The first component of the compensation magnetic field is configured to actively shield a magnetic field sensing region located between the first conductive winding and the second conductive winding from ambient background magnetic fields along a first axis that is substantially orthogonal to the first plane and the second plane.
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6.发明申请公开(公告)号：US20200256929A1
公开(公告)日：2020-08-13
申请号：US16752393
申请日：2020-01-24
申请人： HI LLC
IPC分类号： G01R33/032 , G01R33/028 , G01R33/32
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：US11779251B2
公开(公告)日：2023-10-10
申请号：US17328235
申请日：2021-05-24
申请人： HI LLC
CPC分类号： A61B5/245 , A61B5/6803 , G01R33/26 , A61B2562/182
摘要： A shielding arrangement for a magnetoencephalography (MEG) system includes a passively shielded enclosure having a plurality of walls defining the passively shielded enclosure, each of the plurality of walls including passive magnetic shielding material to reduce an ambient background magnetic field within the passively shielded enclosure; a vestibular wall extending from a first vertical wall to define, and at least partially separate, a vestibular area of the passively shielded enclosure adjacent the doorway and a user area of the passively shielded enclosure; and active shield coils distributed within the passively shielded enclosure and configured to further reduce the ambient background magnetic field within the user area of the passively shielded enclosure.
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公开(公告)号：US11480632B2
公开(公告)日：2022-10-25
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： A magnetic field measurement system 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 a first feedback loop that includes a first low pass filter with a first cutoff frequency and a second feedback loop that includes a second low pass filter with a second cutoff frequency. The first and second feedback loops are configured to compensate for magnetic field variations having a frequency lower than the first or second cutoff frequency, respectively.
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9.发明授权公开(公告)号：US11360164B2
公开(公告)日：2022-06-14
申请号：US16820131
申请日：2020-03-16
申请人： HI LLC
发明人： Micah Ledbetter , Hooman Mohseni , Jamu Alford , Ethan Pratt , Daniel Sobek
IPC分类号： G01R33/26
摘要： An array of optically pumped magnetometers includes a vapor cell arrangement having a wafer defining one or more cavities and alkali metal atoms disposed in the cavities to provide an alkali metal vapor; an array of light sources, each of the light sources arranged to illuminate a different portion of the one or more cavities of the vapor cell arrangement with light; at least one mirror arranged to reflect the light from the array of light sources after the light passes through the one or more cavities of the vapor cell arrangement; and an array of detectors to receive light reflected by the at least one mirror, wherein each of the detectors is arranged to receive light originating from one of the light sources.
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公开(公告)号：US20210369166A1
公开(公告)日：2021-12-02
申请号：US17328235
申请日：2021-05-24
申请人： HI LLC
摘要： A shielding arrangement for a magnetoencephalography (MEG) system includes a passively shielded enclosure having a plurality of walls defining the passively shielded enclosure, each of the plurality of walls including passive magnetic shielding material to reduce an ambient background magnetic field within the passively shielded enclosure; a vestibular wall extending from a first vertical wall to define, and at least partially separate, a vestibular area of the passively shielded enclosure adjacent the doorway and a user area of the passively shielded enclosure; and active shield coils distributed within the passively shielded enclosure and configured to further reduce the ambient background magnetic field within the user area of the passively shielded enclosure.
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