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210 条记录 (耗时 0.012 秒)

    Josephson signal detector
    131.
    发明公开
    Josephson signal detector 失效
    约瑟夫森-Signaldetektor。

    公开(公告)号：EP0660126A2

    公开(公告)日：1995-06-28

    申请号：EP94309494.6

    申请日：1994-12-19

    申请人： HITACHI, LTD.

    发明人： Takeda, Eriko ,  Nishino, Toshikazu

    IPC分类号： G01R33/035

    CPC分类号： G01R33/0354 ,  Y10S505/846

    摘要： Disclosed is a Josephson signal detector having (1) a sensor with at least one Josephson junction (e.g., a SQUID) and (2) a comparator (e.g., an analog-to-digital converter); a measurement system using such detector; and a method of using such detector and measurement system. The detector can be, e.g., a digital SQUID. The detector can also include a readout circuit for reading out the output of the comparator. In one aspect of the invention, the sensor, or both the sensor and readout circuit, are powered by a DC current source (5). Through use of the DC current source, it is possible to provide, e.g., a digital SQUID, having reduced crosstalk and reduced fluctuation of ground potential, and which is kept from an increase in noise or a misoperation. In another aspect of the present invention, the comparator, which includes at least one Josephson junction, is provided with a capacitance such that Josephson oscillation generated by the Josephson junction of the sensor during operation of the sensor has a higher frequency than that corresponding to the turn-on delay of the Josephson junction of the comparator. Due to this latter aspect, current noise due to Josephson oscillation can be reduced, to provide a detector with high accuracy and which can be kept from misoperation.

    摘要翻译： 公开了约瑟夫森信号检测器，其具有（1）具有至少一个约瑟夫逊结（例如，SQUID）的传感器和（2）比较器（例如，模数转换器）; 使用这种检测器的测量系统; 以及使用这种检测器和测量系统的方法。 检测器可以是例如数字SQUID。 检测器还可以包括用于读出比较器的输出的读出电路。 在本发明的一个方面，传感器或传感器和读出电路都由直流电流源供电。 通过使用DC电流源，可以提供例如数字SQUID，其具有减少的串扰和减小地电势的波动，并且防止噪声或错误操作的增加。 在本发明的另一方面，包括至少一个约瑟夫逊结的比较器具有电容，使得在传感器操作期间由传感器的约瑟夫逊结产生的约瑟夫逊振荡具有比对应于传感器的频率更高的频率 比较器的约瑟夫逊结的开启延迟。 由于后一方面，可以减少由于约瑟夫逊振荡引起的电流噪声，以提供高精度的检测器，并且可以防止误操作。

    Superconducting magnetometer with digital output
    133.
    发明公开
    Superconducting magnetometer with digital output 失效
    超导磁力计与数字信号输出。

    公开(公告)号：EP0617295A3

    公开(公告)日：1994-10-12

    申请号：EP93307542.6

    申请日：1993-09-23

    申请人： FUJITSU LIMITED

    发明人： Gotoh, Kohtaroh, c/o Fujitsu Limited

    IPC分类号： G01R33/035

    CPC分类号： G01R33/0356 ,  Y10S505/846

    摘要： A superconducting magnetic sensor includes a SQUID (10) for interlinking with an external magnetic flux, an A.C. bias circuit (11) for driving the SQUID with an A.C. bias current having a first frequency, a feedback circuit (15) supplied with output voltage pulses from the SQUID for calculating a difference between the total number of positive output voltage pulses and the total number of negative output voltage pulses and for producing a feedback magnetic flux in response thereto such that the external magnetic flux is canceled out by the feedback magnetic flux, and a modulation current source (12) for supplying a modulation current having a frequency substantially smaller than the frequency of the bias current and for producing a modulation magnetic flux in response to the modulation current such that the modulation magnetic flux interlinks with the SQUID.

    Schaltungsanordnung zum Betrieb eines SQUID's, insbesondere eines DC-SQUID's
    134.
    发明公开
    Schaltungsanordnung zum Betrieb eines SQUID's, insbesondere eines DC-SQUID's 失效
    用于SQUID的操作的电路装置，特别是DC-SQUID。

    公开(公告)号：EP0584867A3

    公开(公告)日：1994-10-12

    申请号：EP93202412.8

    申请日：1993-08-17

    申请人： Philips Patentverwaltung GmbH ,  Philips Electronics N.V.

    发明人： Krüger, Johann Emil Wilhelm ,  Dössel, Olaf Helmut

    IPC分类号： G01R33/035

    CPC分类号： G01R33/0358 ,  Y10S505/846

    摘要： Schaltungsanordnung zum Betrieb eines SQUID's, insbesondere eines DC-SQUID's (21) mit einer Einkoppelspule (25) in einem bedämpften Meßkreis (26), mindestens einem Widerstand (27), Verbindungsleitungen (19, 20, 23, 24, 34, 35) und Kontaktpads (11, 12, 13, 14, 15, 16) zum Anschluß des SQUID's (21), eines Gradiometers (18) und einer Regelelektronik, wobei die Schaltungsanordnung eine rückwirkungsfreie integrierte Regelkreisschaltung und Sonderfunktionen ermöglicht und gleichzeitig deren Herstellung wesentlich vereinfacht, durch eine erste und eine zweite Verbindungsleitung (34, 35), die zwischen dem Meßkreis (26) und einem ersten und zweiten Kontaktpad (11, 12) zum Anschluß mindestens des Ausgangssignals der Regelelektronik und zum galvanischen Einkoppeln des von dieser bereitgestellten integrierten Reglerstroms vorgesehen sind, wobei das SQUID-Signal als Eingangssignal der Regelelektronik über einen fünften und sechsten Kontaktpad (13, 14) zur Verfügung steht.

    Planar magnetism sensor utilizing a squid of oxide superconductor
    135.
    发明公开
    Planar magnetism sensor utilizing a squid of oxide superconductor 失效
    使用氧化物超导体的平面磁传感器

    公开(公告)号：EP0567386A3

    公开(公告)日：1994-09-28

    申请号：EP93401012.5

    申请日：1993-04-20

    申请人： SUMITOMO ELECTRIC INDUSTRIES, LTD.

    发明人： Matsuura, Takashi, c/o Itami Works ,  Itozaki, Hideo, c/o Itami Works

    IPC分类号： G01R33/035 ,  H01L39/24

    CPC分类号： G01R33/0358 ,  Y10S505/846

    摘要： 57 A magnetism sensor comprises a substrate, a SQUID including a washer of an oxide superconductor thin film formed on a principal surface of the substrate, a hole shaped a similar figure to the washer at the center of the washer, a slit formed between one side of the washer and the hole and a Josephson junction by which portions of the washer at the both sides of the slit are connected across the slit. The magnetism sensor further comprises a superconducting flux transformer of an oxide superconductor thin film including an input coil arranged on the SQUID but isolated from the SQUID and a pickup coil arranged on the principal surface of the substrate far from the SQUID, which are connected in parallel and a magnetism shield which excludes flux penetrating into the Josephson junction of the SQUID.

    Magnetic field detecting circuit
    138.
    发明公开
    Magnetic field detecting circuit 失效
    磁场检测电路

    公开(公告)号：EP0541024A3

    公开(公告)日：1994-01-12

    申请号：EP92118704.3

    申请日：1992-11-01

    申请人： SEIKO INSTRUMENTS INC. ,  AGENCY OF INDUSTRIAL SCIENCE AND TECHNOLOGY

    发明人： Kiryu, Shogo, c/o Agency of Industry & Technology ,  Shimizu, Nobuhiro ,  Chiba, Norio

    IPC分类号： G01R33/035

    CPC分类号： G01R33/0356 ,  Y10S505/846

    摘要： A magnetic field detecting circuit for measuring weak magnetic field in a high sensitivity. The circuit has a relaxation oscillator in which a coil (3) and a resistor (2) connected in series with each other are connected in parallel with a Josephson device (1), and of a magnetic field input circuit (4) magnetically coupled with the coil of the oscillator circuit for applying the detected magnetic field into the oscillator circuit, whereby oscillation frequency is shifted corresponding to the detected magnetic field. An optimum design of the magnetic field detecting circuit is achieved independently for a parameter of the relaxation oscillator and a parameter of a receiving circuit respectively, and a multi-channelization of the detecting circuit is achieved easier by the structure.

    摘要翻译： 一种用于以高灵敏度测量弱磁场的磁场检测电路。 该电路具有弛张振荡器和磁场输入电路（4），所述弛张振荡器中彼此串联连接的线圈（3）和电阻器（2）与约瑟夫森器件（1）并联连接，所述磁场输入电路 振荡器电路的线圈用于将检测到的磁场施加到振荡器电路中，由此振荡频率相应于检测到的磁场而偏移。 磁场检测电路的优化设计分别针对张弛振荡器的参数和接收电路的参数来实现，并且通过该结构可以更容易地实现检测电路的多信道化。

    A multichannel device for measurement of weak spatially and temporally varying magnetic fields
    140.
    发明公开
    A multichannel device for measurement of weak spatially and temporally varying magnetic fields 失效
    用于测量弱空间和瞬时变化磁场的多通道设备

    公开(公告)号：EP0492262A3

    公开(公告)日：1993-08-04

    申请号：EP91121130.8

    申请日：1991-12-10

    申请人： NEUROMAG LTD.

    发明人： Ahonen, Antti Ilamri ,  Knuutila, Jukka Erkki Tapani ,  Simola, Juha Tapani Antero ,  Vilkman, Visa Antero

    IPC分类号： G01R33/035

    CPC分类号： G01R33/0358 ,  Y10S505/846

    摘要： The invention concerns a superconducting device used to measure temporally and spatially varying magnetic fields generated by sources inside the object to be investigated. The invention consists of a body divided into separate and easily interchangeable self-supporting modules, interconnected by connectors. The superconducting magnetometer or gradiometer elements (12) have been attached by means of connectors (11) to the cross-connection/support element (6); this element (6) is attached to a connecting element (4) by means of connectors as well. The connecting element (4) contains also the electric components (5) necessary for connecting the SQUIDs to the room temperature electronics (14). The connecting element (4) is attached to the neck plug (3), comprising a stiff thermal isolation preventing convection and a ribbon cable made of parallel twisted pairs. The element (3) is self-supporting and it forms an integral part of the magnetometer support structure. The cables in the neck plug have been made out of wires having a relatively high resistance in order to minimize the heat leak between the room temperature and the cryogenic environment of the magnetometers; the excess noise caused by the resistive leads has been compensated, for example by increasing the SQUID gain using positive feedback.