公开(公告)号：US20210076978A1

公开(公告)日：2021-03-18

申请号：US16988176

申请日：2020-08-07

Applicant: HITACHI, LTD.

Inventor： Akihiko KANDORI ,  Ryuzo KAWABATA ,  Kuniomi OGATA ,  Takako MIZOGUCHI ,  Tsukasa FUNANE

IPC: A61B5/08 ,  A61B5/0408

Abstract: To perform respiratory monitoring and cardiac-output measurement on general patients, an aspect of a biological measurement apparatus includes: at least two electrodes that are attached to a living body; a power supply that causes an AC current to flow between the two electrodes; at least two coils that are placed so as to sandwich a line linking the two electrodes, and detect a magnetic field related to a change in the AC current accompanying a change in impedance of the living body; and a detection circuit that performs addition or subtraction of signals related to the magnetic field detected with the two coils, and outputs the signals as a change in the impedance.

公开(公告)号：US20160313417A1

公开(公告)日：2016-10-27

申请号：US15100801

申请日：2013-12-03

Applicant: HITACHI, LTD.

Inventor： Ryuzo KAWABATA ,  Akihiko KANDORI

IPC: G01R33/26 ,  H01S3/13 ,  H01S5/14 ,  G02B27/10 ,  H01S5/0687

CPC classification number: G01R33/26 ,  G02B27/106 ,  H01S3/1303 ,  H01S5/005 ,  H01S5/0085 ,  H01S5/0687 ,  H01S5/14 ,  H01S2301/02

Abstract: The present invention addresses the problem of stabilizing signals in magnetic field measurement using optical pumping. In order to solve the problem, disclosed is a light source apparatus (10) that is characterized in having: a light intensity fluctuation detection circuit (130) that detects intensity fluctuation of light outputted from a laser output unit (11); and an acousto-optic modulator (121) that corrects light intensity on the basis of light intensity fluctuation detected by means of the light intensity fluctuation detection circuit (130) such that the light intensity is constant Furthermore, a magnetic field measuring apparatus of the present invention is characterized in having: one sensor unit that passes therethrough light outputted from a light source unit: and a signal control processor that eliminates the light intensity fluctuation on the basis of two lights passed through the sensor unit.

Abstract translation: 本发明解决了使用光泵浦在磁场测量中稳定信号的问题。 为了解决这个问题，公开了一种光源装置（10），其特征在于具有：检测从激光输出部（11）输出的光的强度波动的光强度波动检测电路（130）。 以及声光调制器（121），其基于通过光强度波动检测电路（130）检测的光强度波动来校正光强度，使得光强度恒定。此外，本发明的磁场测量装置 本发明的特征在于具有：通过从光源单元输出的光的一个传感器单元;以及信号控制处理器，其基于通过传感器单元的两个光消除光强度波动。

公开(公告)号：US20130265042A1

公开(公告)日：2013-10-10

申请号：US13827062

申请日：2013-03-14

Applicant: HITACHI, LTD.

Inventor： Ryuzo KAWABATA ,  Akihiko KANDORI ,  Taro OSABE ,  Seiichi SUZUKI ,  Yudai KAMADA

IPC: G01R33/26

CPC classification number: G01R33/26

Abstract: Stable magnetic field measurement is enabled without collapse of polarization or fluctuation of intensity of a laser beam incident on a glass cell of an optical pumping magnetic sensor. Excitation light generated with a light source, having optimized light intensity and polarized wave, through frequency stabilization, intensity control and polarized-wave control, is introduced via a polarized wave holding optical fiber to a magnetic sensor provided in a magnetic shield, and magnetic field measurement is performed by optical pumping using magneto-optical properties of spin-polarized alkali metal. The magnetic sensor has a structure where a lens, a polarization optical device, the glass cell and a photodetector, are integrally accommodated in a non-magnetic case.

Abstract translation: 能够进行稳定的磁场测量，而不会使入射在光泵送磁传感器的玻璃电池上的激光束的偏振或强度波动。 通过频率稳定，强度控制和极化波控制，通过偏振波保持光纤将具有优化的光强度和极化波的光源产生的激发光引入设置在磁屏蔽中的磁传感器，并且磁场 通过使用自旋极化碱金属的磁光性质的光泵浦进行测量。 磁传感器具有将透镜，偏振光学装置，玻璃电池和光电检测器一体地容纳在非磁性壳体中的结构。

公开(公告)号：US20160169989A1

公开(公告)日：2016-06-16

申请号：US14904460

申请日：2013-08-08

Applicant: HITACHI, LTD.

Inventor： Seiichi SUZUKI ,  Taro OSABE ,  Yudai KAMADA ,  Ryuzo KAWABATA ,  Akihiko KANDORI

IPC: G01R33/26

CPC classification number: G01R33/26

Abstract: An object of the present invention is to provide a technique to improve a manufacturing yield of a gas cell included in a magnetic field measuring apparatus. A gas cell GC according to an embodiment is characterized in that, for example, a cavity CAV includes an opening OP1 and an opening OP2, a plane size of the opening OP1 becomes larger than a plane size of the opening OP2 in the openings OP1 and OP2 included in the cavity CAV. Especially, according to the embodiment, the opening OP2 is included in the opening OP1 in plan view. Consequently, a width of the opening OP1 coming into contact with an upper surface of the sealing substrate 1S becomes larger than a width of the opening OP2 coming into contact with a lower surface of the sealing substrate 2S.

Abstract translation: 本发明的目的是提供一种提高包含在磁场测量装置中的气室的制造成品率的技术。 根据实施例的气室GC的特征在于，例如，空腔CAV包括开口OP1和开口OP2，开口OP1的平面尺寸变得大于开口OP1中的开口OP2的平面尺寸， OP2包含在腔CAV中。 特别地，根据实施例，开口OP2在俯视图中包括在开口OP1中。 因此，与密封基板1S的上表面接触的开口OP1的宽度大于与密封基板2S的下表面接触的开口OP2的宽度。

公开(公告)号：US20160146909A1

公开(公告)日：2016-05-26

申请号：US14905132

申请日：2013-08-02

Applicant: HITACHI, LTD.

Inventor： Ryuzo KAWABATA ,  Akihiko KANDORI ,  Taro OSABE ,  Seiichi SUZUKI ,  Yuudai KAMADA

IPC: G01R33/26

CPC classification number: G01R33/26 ,  G01N24/006 ,  H01S3/091

Abstract: A magnetic measurement device has a magnetic sensor including a glass cell having alkali metal gas encapsulated therein that is configured to detect a magnetic field using a magneto-optical characteristic of spin-polarized alkali metal. A laser light source is configured to generate pump light introduced into the magnetic sensor and a coil provided in the same magnetically shielded space as the magnetic sensor is configured to apply a static magnetic field and a RF magnetic field to the magnetic sensor. A signal processor is configured to perform lock-in detection of a light detection signal transmitted through the glass cell of the magnetic sensor, control an intensity of the static magnetic field and a frequency of the RF magnetic field generated by the coil according to a lock-in detection output, and obtain a measurement signal reflecting a magnetic field intensity of an object to be measured in the magnetically shielded space.

Abstract translation: 磁性测量装置具有磁传感器，该磁传感器包括其中封装有碱金属气体的玻璃电池，其被配置为使用自旋极化碱金属的磁光特性来检测磁场。 激光源被配置为产生引入到磁传感器中的泵浦光，并且设置在与磁传感器相同的磁屏蔽空间中的线圈，用于将静磁场和RF磁场施加到磁传感器。 信号处理器被配置为执行通过磁传感器的玻璃单元传输的光检测信号的锁定检测，控制静磁场的强度和由线圈根据锁产生的RF磁场的频率 - 在检测输出中，并且获得在磁屏蔽空间中反映待测物体的磁场强度的测量信号。

公开(公告)号：US20230399036A1

公开(公告)日：2023-12-14

申请号：US18137593

申请日：2023-04-21

Applicant: Hitachi, Ltd.

Inventor： Ryuzo KAWABATA ,  Kuniomi OGATA

IPC: B61K9/08 ,  G01N27/82

CPC classification number: B61K9/08 ,  G01N27/82

Abstract: A rail state monitoring apparatus includes: a plurality of detection devices provided on a train that travels on left and right railroad rails forming a track, and a processing device. The train is composed of one or a plurality of vehicles. For each of the plurality of detection devices, the detection device has a magnetic sensor unit group that is one or more magnetic sensor units facing the railroad rail, the magnetic sensor unit detects a peculiar point when the magnetic sensor unit passes over the peculiar point on the railroad rail, and the detection device outputs a signal based on a result of the detection by the magnetic sensor unit group. The plurality of detection devices include detection devices provided symmetrically on right and left sides of the train and/or detection devices provided on front and rear sides of the train. The processing device receives signals output respectively from the plurality of detection devices, and discriminates whether the peculiar point is a rail seam point or a rail fracture point, based on a detection signal based on the signals from the plurality of detection devices.

公开(公告)号：US20130288384A1

公开(公告)日：2013-10-31

申请号：US13803632

申请日：2013-03-14

Applicant: HITACHI, LTD.

Inventor： Takako MIZOGUCHI ,  Ryuzo KAWABATA ,  Akihiko KANDORI

IPC: G01N27/72

CPC classification number: G01N27/72 ,  G01N33/54333

Abstract: In a magnetic immunoassay using AC magnetic susceptibility measurement, a signal from non-coupled magnetic particles is prevented to mix with a desired measurement signal from magnetic particles coupled with an object to be measured. A sample vessel in which a mixed solution of an inspection objective sample and the magnetic particles are included is carried by a sample support, such that a precipitation of the magnetic particle coupled with the object to be measured dispersed in the solution by a magnetic field from a dissociating coil is promoted. Next, the sample vessel is carried to the magnetizing coil and the magnetic signal from the non-coupled magnetic particle remaining in a supernatant in the vessel is peculiarly measured by an MR sensor to perform AC magnetic susceptibility measurement with high precision.

Abstract translation: 在使用AC磁化率测量的磁性免疫测定中，防止来自非耦合磁性颗粒的信号与来自与待测量物体耦合的磁性颗粒的期望测量信号混合。 其中包括检查对象样品和磁性颗粒的混合溶液的样品容器由样品载体承载，使得通过磁场将与待测物体偶联的待测物体沉淀在溶液中， 促进离解线圈。 接下来，将样品容器搬运到磁化线圈，通过MR传感器特异性地测定残留在容器上清液中的非结合磁性粒子的磁信号，以高精度进行交流磁化率测定。