公开(公告)号：US20180330863A1

公开(公告)日：2018-11-15

申请号：US15966904

申请日：2018-04-30

Applicant: Korea Research Institute of Standards and Science

Inventor： Seong-min Hwang ,  Jeong-Hyun Shim ,  Ingo Hilschenz ,  Seong-Joo Lee ,  Kiwoong Kim

IPC: H01F27/10 ,  H01F7/06 ,  H01F27/22

CPC classification number: H01F27/10 ,  H01F7/06 ,  H01F27/22

Abstract: An electromagnet includes insulating cooling plates of a ceramic material which are vertically arranged parallel to each other, washer-shaped insulating center spacers maintained at a constant distance between adjacent insulating cooling plates, pancake coils including Litz wires which are spirally wound on each of the insulating center spacers in the space between the adjacent insulating cooling plates, and a housing which covers at least outer side surfaces of the insulating cooling plates and the pancake coils and provides a coolant to cool the insulating cooling plates.

公开(公告)号：US11064900B2

公开(公告)日：2021-07-20

申请号：US16085488

申请日：2017-04-03

Applicant: KOREA RESEARCH INSTITUTE OF STANDARDS AND SCIENCE

Inventor： Seong-Joo Lee ,  Kiwoong Kim ,  Jeong-Hyun Shim ,  Kwon-Kyu Yu ,  Seong-min Hwang

IPC: A61B5/055 ,  G01R33/48 ,  G01R33/381 ,  G01R33/32 ,  G01R33/56 ,  A61B5/00 ,  G01R33/24 ,  G01R33/44 ,  G01R33/421

Abstract: Provided are an ultra-low field nuclear magnetic resonance device and a method for measuring an ultra-low field nuclear resonance image. The ultra-low field nuclear magnetic resonance device includes an AC power supply configured to supply a current to a measurement target in such a manner the current flows to the measurement target, magnetic field measurement means disposed adjacent to the measurement target, and measurement bias magnetic field generation means configured to apply a measurement bias magnetic field corresponding to a proton magnetic resonance frequency of the measurement target. A vibration frequency of the AC power supply matches the proton magnetic resonance frequency of the measurement target, and the magnetic field measurement means measures a nuclear magnetic resonance signal generated from the measurement target.

公开(公告)号：US10162028B2

公开(公告)日：2018-12-25

申请号：US14618535

申请日：2015-02-10

Applicant: Korea Research Institute of Standards and Science

Inventor： Seong-min Hwang ,  Kiwoong Kim ,  Kwon-Kyu Yu ,  Seong-Joo Lee ,  Jeong-Hyun Shim

IPC: G01R33/44 ,  G01R33/3815 ,  G01R33/32 ,  G01R33/34

Abstract: Provided is a low magnetic field and ultra-low magnetic field NMR and MRI apparatus. The low magnetic field and ultra-low magnetic field NMR and MRI apparatus includes a SQUID sensor and a prepolarization magnetic field coil. The prepolarization magnetic field coil generates a prepolarization magnetic field to polarize a sample. The prepolarization magnetic coil generates a counter pulse in a direction opposite to that of the prepolarization magnetic field immediately before or immediately after the prepolarization magnetic field is generated. The counter pulse demagnetizes wanted magnetization including that of the prepolarization magnetic field coil itself.

公开(公告)号：US09927501B2

公开(公告)日：2018-03-27

申请号：US14573718

申请日：2014-12-17

Applicant: Korea Research Institute of Standards and Science

Inventor： Kiwoong Kim ,  Hyun-joon Lee ,  Jeong-Hyun Shim

IPC: G01R33/26 ,  G01R33/032

CPC classification number: G01R33/26 ,  G01R33/032

Abstract: Provided are an atomic magnetometer and an operating method of the same. The atomic magnetometer includes a vapor cell receiving a circularly polarized pump beam and a linearly polarized probe beam and containing an alkali metal vapor, a detector adapted to receive the probe beam passing through the vapor cell to measure magneto-optical rotation of the probe beam, a feedback coil to establish a negative feedback magnetic field signal orthogonal to a first plane defined by traveling directions of the probe beam and the pump beam and provide the negative feedback magnetic field signal to the vapor cell, and a feedback amplifier adapted to provide feedback current to the feedback coil such that the negative feedback magnetic field proportional to a measurement magnetic field is established. The measurement magnetic field of a measurement target provides magneto-optical rotation of the probe beam in the vapor cell.

公开(公告)号：US20160209482A1

公开(公告)日：2016-07-21

申请号：US14618535

申请日：2015-02-10

Applicant: Korea Research Institute of Standards and Science

Inventor： Seong-min Hwang ,  Kiwoong Kim ,  Kwon-Kyu Yu ,  Seong-Joo Lee ,  Jeong-Hyun Shim

IPC: G01R33/44 ,  G01R33/3815 ,  G01R33/32

CPC classification number: G01R33/445 ,  G01R33/326 ,  G01R33/34023 ,  G01R33/3815

Abstract: Provided is a low magnetic field and ultra-low magnetic field NMR and MRI apparatus. The low magnetic field and ultra-low magnetic field NMR and MRI apparatus includes a SQUID sensor and a prepolarization magnetic field coil. The prepolarization magnetic field coil generates a prepolarization magnetic field to polarize a sample. The prepolarization magnetic coil generates a counter pulse in a direction opposite to that of the prepolarization magnetic field immediately before or immediately after the prepolarization magnetic field is generated. The counter pulse demagnetizes wanted magnetization including that of the prepolarization magnetic field coil itself.

Abstract translation: 提供了低磁场和超低磁场NMR和MRI装置。 低磁场和超低磁场NMR和MRI装置包括SQUID传感器和预极化磁场线圈。 预极化磁场线圈产生极化磁极以使样品极化。 前极化磁线圈在产生前极化磁场之前或之后产生与反极化磁场相反方向的计数脉冲。 计数脉冲使包括预极化磁场线圈本身的所需磁化消磁。

公开(公告)号：US20160116553A1

公开(公告)日：2016-04-28

申请号：US14573718

申请日：2014-12-17

Applicant: Korea Research Institute of Standards and Science

Inventor： Kiwoong Kim ,  Hyun-joon Lee ,  Jeong-Hyun Shim

IPC: G01R33/26 ,  G01R33/032

CPC classification number: G01R33/26 ,  G01R33/032

Abstract: Provided are an atomic magnetometer and an operating method of the same. The atomic magnetometer includes a vapor cell receiving a circularly polarized pump beam and a linearly polarized probe beam and containing an alkali metal vapor, a detector adapted to receive the probe beam passing through the vapor cell to measure magneto-optical rotation of the probe beam, a feedback coil to establish a negative feedback magnetic field signal orthogonal to a first plane defined by traveling directions of the probe beam and the pump beam and provide the negative feedback magnetic field signal to the vapor cell, and a feedback amplifier adapted to provide feedback current to the feedback coil such that the negative feedback magnetic field proportional to a measurement magnetic field is established. The measurement magnetic field of a measurement target provides magneto-optical rotation of the probe beam in the vapor cell.

Abstract translation: 提供了一种原子磁强计及其操作方法。 原子磁强计包括接收圆偏振泵浦光束和线性偏振探测光束并含有碱金属蒸气的蒸汽单元，适于接收通过蒸气室的探测光束以测量探测光束的磁旋转的检测器， 反馈线圈，用于建立与由所述探测光束和所述泵浦光束的行进方向限定的第一平面正交的负反馈磁场信号，并向所述蒸汽单元提供所述负反馈磁场信号;以及反馈放大器，其适于提供反馈电流 到反馈线圈，使得与测量磁场成比例的负反馈磁场被建立。 测量对象的测量磁场提供了探测光束在蒸气室中的磁光旋转。