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。