公开(公告)号：US06853185B2

公开(公告)日：2005-02-08

申请号：US10844480

申请日：2004-05-13

申请人： Akira Tsukamoto ,  Koichi Yokosawa ,  Daisuke Suzuki ,  Akihiko Kandori ,  Keiji Tsukada

发明人： Akira Tsukamoto ,  Koichi Yokosawa ,  Daisuke Suzuki ,  Akihiko Kandori ,  Keiji Tsukada

IPC分类号： A61B5/05 ,  G01R33/025 ,  G01R33/035 ,  G01R33/02

CPC分类号： G01R33/0358 ,  G01R33/025

摘要： A magnetic field measurement system for canceling an external field is provided, in which plurality of sensing magnetometers (3) for measuring a magnetic field signal in a direction perpendicular to the center axis of a cylindrical magnetic shield (1) are arranged in two dimensions on a plane parallel to the center axis and a reference magnetometer (4) for measuring the external field parallel to the center axis as a reference signal is disposed on a plane perpendicular to the plane parallel to the center axis. The reference signal multiplied by a specified factor is subtracted from a difference between signals from the adjacent sensing magnetometers (3). The magnetic field measurement system allows measurement of an extremely weak magnetic field by efficiently canceling the external field.

摘要翻译： 提供了用于消除外部场的磁场测量系统，其中用于在与圆柱形磁屏蔽（1）的中心轴垂直的方向上测量磁场信号的多个感测磁力计（3）被二维地布置在 平行于中心轴的平面和用于测量与中心轴平行的外场作为参考信号的参考磁力计（4）设置在垂直于平行于中心轴的平面的平面上。 从相邻感测磁力计（3）的信号之间的差中减去乘以指定因子的参考信号。 磁场测量系统允许通过有效地消除外部场来测量极弱的磁场。

公开(公告)号：US06815949B2

公开(公告)日：2004-11-09

申请号：US10162748

申请日：2002-06-06

申请人： Akihiko Kandori ,  Tsuyoshi Miyashita ,  Keiji Tsukada ,  Koichi Yokosawa ,  Daisuke Suzuki ,  Akira Tsukamoto

发明人： Akihiko Kandori ,  Tsuyoshi Miyashita ,  Keiji Tsukada ,  Koichi Yokosawa ,  Daisuke Suzuki ,  Akira Tsukamoto

IPC分类号： G01R33035

CPC分类号： G01R33/0356 ,  A61B5/04005 ,  A61B5/04007 ,  A61B5/04008 ,  A61B5/0522

摘要： An apparatus can detect a magnetic field with a high sensitivity using an ordinary-temperature pickup coil even when the pickup coil is arranged outside a cryostat. Specifically, the apparatus for measuring a magnetic field includes a pickup coil for detecting an external magnetic field, a SQUID electrically or magnetically connected to the pickup coil, a cryostat for holding the SQUID at low temperatures, and a driving device for driving the SQUID. The pickup coil is made of a normal-conducting material and is placed at an ordinary temperature outside the cryostat. By arranging outside the cryostat, the pickup coil can be brought close to a subject and can thereby detect a weak magnetic field in the subject with a high sensitivity.

公开(公告)号：US5166614A

公开(公告)日：1992-11-24

申请号：US525665

申请日：1990-05-21

申请人： Koichi Yokosawa ,  Hideaki Nakane

发明人： Koichi Yokosawa ,  Hideaki Nakane

IPC分类号： A61B5/04 ,  A61B5/05 ,  G01R33/035 ,  H01L39/22

CPC分类号： G01R33/0358 ,  Y10S505/846

摘要： A pickup coil and a planar type SQUID are formed integrally on a single substrate to form a SQUID magnetometer. The SQUID is disposed on the surface of a projecting portion of the substrate and an insulating layer for spacing is laminated on the SQUID. The top, bottom and side surfaces of the assembly of the SQUID and insulating layer covering the same are all covered with a superconducting layer to form a magnetic shield for enclosing the SQUID. The magnetic shield is remote from the planar type pickup coil disposed on the remaining portion of the substrate by a distance which is equal to or greater than a length of one side of the size of the magnetic shield, thereby preventing magnetic flux distortion due to the presence of the magnetic shield from disturbing coil balance of the pickup coil.

公开(公告)号：US20060114114A1

公开(公告)日：2006-06-01

申请号：US11181928

申请日：2005-07-15

申请人： Sadaki Nakano ,  Koichi Yokosawa ,  Yasushi Goto

发明人： Sadaki Nakano ,  Koichi Yokosawa ,  Yasushi Goto

IPC分类号： G08B17/10 ,  H04L12/26 ,  G08B1/08 ,  G08B21/00

CPC分类号： G08B25/08 ,  G08B21/16 ,  G08B21/182 ,  G08B25/007 ,  G08B25/10

摘要： In a hydrogen gas station where a great number of sensors are installed, in case hydrogen leakage occurs, sensors in the vicinity of the leakage location start to transmit warning to an access point all at once. This causes channel capacity saturation and failure to transmit warning to the access point. Nodes and the access point are connected each other by an uplink channel and a downlink channel. The access point detects congested/uncongested status of the uplink channel by using a wireless transmitter module and notifies the nodes of the congested/uncongested status of the channel by means for transmitting onto the downlink channel. Meanwhile, each node controls its transmission operation, according to the hydrogen concentration level detected by its hydrogen sensor and the uplink channel congested/uncongested status notified from the access point. In this way, channel overflow due to access congestion in case of hydrogen leakage can be prevented.

摘要翻译： 在安装了大量传感器的氢气站中，在发生氢泄漏的情况下，泄漏位置附近的传感器开始一次性向接入点发送警告。 这导致通道容量饱和，并且无法向接入点发送警告。 节点和接入点通过上行链路信道和下行链路信道相互连接。 接入点通过使用无线发射机模块来检测上行链路信道的拥塞/非占用状态，并通过传输到下行链路信道的方式向节点通知信道的拥塞/非占用状态。 同时，每个节点根据其氢传感器检测到的氢浓度水平和从接入点通知的上行链路信道拥塞/非占用状态来控制其传输操作。 以这种方式，可以防止在泄漏的情况下由于访问拥塞而导致的信道溢出。

公开(公告)号：US06665552B2

公开(公告)日：2003-12-16

申请号：US09940507

申请日：2001-08-29

申请人： Koichi Yokosawa ,  Daisuke Suzuki ,  Keiji Tsukada ,  Tsuyoshi Miyashita ,  Akihiko Kandori

发明人： Koichi Yokosawa ,  Daisuke Suzuki ,  Keiji Tsukada ,  Tsuyoshi Miyashita ,  Akihiko Kandori

IPC分类号： A61B505

CPC分类号： G01R33/022 ,  G01R33/0358

摘要： A gradiometer integrating pickup coils comprises pickup coils 11Xp, 11Xn magnetically connected to a SQUID through associated input coils 2, and pickup coils 11Yp, 11Yn magnetically connected to a SQUID through associated input coils 2, respectively. Two superconducting loops are connected in series to each of the SQUIDs, when viewed from Josephson junctions 5. The input coils 2 form superconducting closed loops together with the pickup coils 11Xp, 11Xn, 11Yp, 11Yn associated therewith. The SQUIDs are respectively connected to form an 8-figured shape as a whole such that currents flow in two superconducting loops of each SQUID in opposite directions to each other, with respect to the application of a uniform field, in order to reduce environmental magnetic field noise.

公开(公告)号：US06261232B1

公开(公告)日：2001-07-17

申请号：US09445890

申请日：2000-03-30

申请人： Koichi Yokosawa ,  Ryuichi Shinomura

发明人： Koichi Yokosawa ,  Ryuichi Shinomura

IPC分类号： A61B800

CPC分类号： A61B8/4461 ,  A61B8/00 ,  A61B8/12 ,  G01S15/8906 ,  G01S15/895

摘要： A high frequency continuous wave capable of achieving sufficient lateral resolution is produced by a wave transmitting device (20) to constitute a transmitted ultrasonic wave. A frequency of the continuous wave is alternated in a rectangular wave manner by a frequency modulator (15) so as to be frequency-modulated. An alternating time period of the frequency modulation is set to such time two times longer than such delay time which is defined from a time instant when a signal voltage is applied to a piezoelectric transducer element (1) up to another time instant when an ultrasonic wave originated from the piezoelectric transducer is reflected from a focal point 5 and then is reached to the piezoelectric transducer element. In a delay circuit (35), a delay equal to the delay time is applied to the transmitted ultrasonic wave so as to be used as a reference signal. A mixture signal produced by mixing the transmitted ultrasonic wave with the received ultrasonic wave is lock-in-detected (55), so that a reflection signal reflected from the checking object is selectively detected. As a result of increasing a total wave number of transmitted/received waves per unit time, since the continuous wave ultrasonic wave is irradiated onto the checking subject, for instance, in the case that living body tissue is imaged with high resolution at a cell level, S/N is improved.

摘要翻译： 通过波发射装置（20）产生能够实现足够的横向分辨率的高频连续波，以构成发射的超声波。 频率调制器（15）以矩形波方式交替连续波的频率以进行频率调制。 将频率调制的交替时间段设定为从信号电压施加到压电换能器元件（1）的时刻定义的延迟时间的两倍的时间，直到超声波 源自压电换能器的光源从焦点5反射，然后到达压电换能器元件。 在延迟电路（35）中，对发送的超声波施加与延迟时间相等的延迟，作为基准信号。 通过将发送的超声波与接收到的超声波混合而产生的混合信号被锁定检测（55），从而选择性地检测从检查对象反射的反射信号。 作为每单位时间的发送/接收波的总波数增加的结果，由于连续波超声波被照射到检查对象上，例如，在细胞水平以高分辨率成像生物体组织的情况下 ，S / N得到改善。

公开(公告)号：US5955400A

公开(公告)日：1999-09-21

申请号：US904544

申请日：1997-08-04

申请人： Koichi Yokosawa ,  Shinya Kuriki

发明人： Koichi Yokosawa ,  Shinya Kuriki

IPC分类号： G01R33/035 ,  H01L39/22 ,  H01F6/06

CPC分类号： G01R33/0358

摘要： Pickup coils constructed by superconductors and a SQUID part are formed on a single substrate. The pickup coils are parallelly connected to two other superconductors (inductance of the SQUID ring) in a SQUID ring, which consists of two Josephson junctions and two superconductive lines. Each of the superconductors can be a superconductive line of one loop or a washer type coil. Each pickup coil occupies about one half of the area of the substrate and the SQUID and the pickup coils are symmetrical with respect to the center line of the substrate.

摘要翻译： 由超导体构成的拾音线圈和SQUID部分形成在单个基板上。 拾取线圈在SQUID环中并联连接到另外两个超导体（SQUID环的电感），该SQUID环由两个约瑟夫逊结和两个超导线组成。 每个超导体可以是一个环的超导线或一个垫圈型线圈。 每个拾取线圈占据基板面积的大约一半，并且SQUID和拾取线圈相对于基板的中心线是对称的。

公开(公告)号：US5829439A

公开(公告)日：1998-11-03

申请号：US671010

申请日：1996-06-28

申请人： Koichi Yokosawa ,  Shizuo Ishikawa ,  Ryuichi Shinomura ,  Yukio Ito ,  Shuzo Sano ,  Hiroshi Kanda ,  Yutaka Sato ,  Toshio Kondo

发明人： Koichi Yokosawa ,  Shizuo Ishikawa ,  Ryuichi Shinomura ,  Yukio Ito ,  Shuzo Sano ,  Hiroshi Kanda ,  Yutaka Sato ,  Toshio Kondo

IPC分类号： A61B8/12 ,  A61B8/00

CPC分类号： A61B5/6848 ,  A61B8/0841 ,  A61B8/12 ,  A61B8/4461 ,  A61B8/463 ,  A61B8/445

摘要： A needle-like ultrasonic probe includes an inner needle received in a hollow, tubular outer needle for rotation about an axis thereof. The inner needle has a pointed distal end, and a notch is formed in an outer peripheral surface of that portion of the inner needle which is located adjacent to the distal end thereof. At least one ultrasonic transducer, as well as an acoustic lens for converging an ultrasonic wave, produced by the ultrasonic transducer, onto a point near to the outer peripheral surface of the inner needle, is provided in the notch. A filler, having an outer surface conforming to the outer peripheral surface of the inner needle, is fitted in the notch. With this construction, after the inner needle is smoothly stuck into a living tissue, even if it is rotated and axially moved, the living tissue is less affected or damaged by the inner needle.

摘要翻译： 针状超声波探头包括容纳在中空的管状外针中的内针，用于围绕其轴线旋转。 内针具有尖的远端，并且在内针的与其远端相邻的部分的外周面形成有切口。 至少一个超声波换能器以及用于将由超声波换能器产生的超声波收敛的声透镜设置在靠近内针外周面的点上。 具有与内针的外周面相符的外表面的填料装配在凹口中。 利用这种结构，即使内针被平滑地粘贴到生物体组织中，即使其旋转并轴向移动，生物体组织也不会受到内针的影响或损坏。

公开(公告)号：US5021739A

公开(公告)日：1991-06-04

申请号：US426188

申请日：1989-10-25

申请人： Koichi Yokosawa ,  Hideki Kohno

发明人： Koichi Yokosawa ,  Hideki Kohno

IPC分类号： A61B5/055 ,  G01R33/035 ,  G01R33/24 ,  G01R33/36

CPC分类号： G01R33/0358 ,  G01R33/24 ,  Y10S505/844 ,  Y10S505/846

摘要： An RF magnetic flux measuring circuit uses a SQUID fluxmeter of which the input and output characteristics establish a periodic function, and in which a pick-up coil for picking up desired RF magnetic flux and an input coil of the SQUID fluxmeter are connected to form a closed loop which is a superconducting loop for transferring the magnetic flux to the SQUID. There is also provided an inductance adjusting device which adjusts the inductance of the superconducting loop to limit the magnetic flux that crosses the SQUID fluxmeter within a range of a single-valued function in said input and output characteristics.

摘要翻译： RF磁通量测量电路使用输入和输出特性建立周期函数的SQUID磁通计，其中连接用于拾取所需RF磁通的拾波线圈和SQUID磁通计的输入线圈，以形成 闭环，其是用于将磁通传递到SQUID的超导回路。 还提供了一种电感调节装置，其调节超导环路的电感，以在所述输入和输出特性的单值函数的范围内限制穿过SQUID磁通计的磁通量。

公开(公告)号：US4875010A

公开(公告)日：1989-10-17

申请号：US174424

申请日：1988-03-28

申请人： Koichi Yokosawa ,  Etsuji Yamamoto ,  Hideaki Nakane ,  Masao Yabusaki ,  Yukiko Ogura

发明人： Koichi Yokosawa ,  Etsuji Yamamoto ,  Hideaki Nakane ,  Masao Yabusaki ,  Yukiko Ogura

IPC分类号： A61B5/055 ,  A61B10/00 ,  G01R33/035 ,  G01R33/32 ,  G01R33/36

CPC分类号： G01R33/326 ,  G01R33/0358

摘要： In a signal detecting circuit of, for example, an NMR apparatus, a signal transmission path transmits an AC magnetic flux signal to be superposed on a DC magnetic field whose strength does not change with time during a period of signal detection. The signal transmission path comprises a superconducting closed loop including a receiving coil receiving the AC magnetic flux signal, an input coil applying the received AC magnetic flux signal as an input to a flux meter, and a variable resistor replacing part of the superconducting closed loop and having its resistance value changed in relation to a change in the strength of the DC magnetic field.

摘要翻译： 在例如NMR装置的信号检测电路中，在信号检测期间，信号传输路径传输要叠加在强度不随时间变化的直流磁场上的交流磁通信号。 信号传输路径包括超导闭环，包括接收交流磁通信号的接收线圈，输入线圈将接收到的交流磁通信号作为输入馈送到通量计，以及替代部分超导闭环的可变电阻器，以及 其电阻值相对于直流磁场强度的变化而变化。