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    • 3. 发明申请
    • Method and device for non destructive evaluation of defects in a metallic object
    • 用于非破坏性评估金属物体缺陷的方法和装置
    • US20090206831A1
    • 2009-08-20
    • US12280414
    • 2002-02-24
    • Claude FermonMyriam PannetierNicolas BiziereFrancois VacherThierry Sollier
    • Claude FermonMyriam PannetierNicolas BiziereFrancois VacherThierry Sollier
    • G01N27/90
    • G01N27/9046
    • A device for non destructive evaluation of defects in a metallic object (2) by eddy currents, comprises a field emitter (3) for emitting an alternating electromagnetic field at a first frequency fi in the neighbourhood of the metallic object (2), and a magnetoresistive sensor (1) for detecting a response signal constituted by a return electromagnetic field which is re-emitted by eddy currents induced by the alternating electromagnetic field in the metallic object (2). The device further comprises: a driving circuit (230) for driving the magnetoresistive sensor (1) by a current at a second frequency fc which is different from the first frequency fi, so that the magnetoresistive sensor (1) acts as an in situ modulator; a detector for detecting a response signal between the terminals of the magnetoresistive sensor (1); a filter for filtering the response signal detected by the magnetoresistive sensor (1) to keep either the frequency sum (fi+fc) of the first and second frequencies or the frequency difference (fi+fc) of the first and second frequencies, and a processor for processing the filtered response signal and extract eddy current information on defects in the metallic object (2).
    • 用于通过涡流对金属物体(2)中的缺陷进行非破坏性评估的装置包括用于在金属物体(2)附近以第一频率f 1发射交变电磁场的场发射器(3),以及 磁阻传感器(1),用于检测由金属物体(2)中的交变电磁场引起的涡流重新发射的返回电磁场构成的响应信号。 该装置还包括:用于以与第一频率fi不同的第二频率fc的电流驱动磁阻传感器(1)的驱动电路(230),使得磁阻传感器(1)充当原位调制器 ; 用于检测所述磁阻传感器(1)的端子之间的响应信号的检测器; 用于对由磁阻传感器(1)检测到的响应信号进行滤波以保持第一和第二频率的频率和(fi + fc)或第一和第二频率的频率差(fi + fc)的滤波器,以及 处理器,用于处理滤波的响应信号,并提取关于金属物体(2)中的缺陷的涡流信息。
    • 4. 发明授权
    • System for measuring a magnetic resonance signal based on a hybrid superconductive-magnetoresistive sensor
    • 基于混合超导磁阻传感器测量磁共振信号的系统
    • US07944205B2
    • 2011-05-17
    • US12305486
    • 2007-06-22
    • Claude FermonJacques JacquinotMyriam Pannetier-LecoeurJoseph Scola
    • Claude FermonJacques JacquinotMyriam Pannetier-LecoeurJoseph Scola
    • G01V3/00
    • G01R33/32B82Y25/00G01R33/093G01R33/34023
    • The system for measuring a magnetic resonance signal within a sample (4) placed in a static external magnetic field (H) includes an excitation device (1 to 3, 6 to 10) for applying high-intensity radio-frequency pulses at a predetermined emission frequency fe in a measurement zone containing the sample (4). The excitation device includes an excitation coil (3) tuned to the predetermined emission frequency fe and disposed in the vicinity of the sample (4) in such a way as to produce an electromagnetic field essentially perpendicular to the static external magnetic field (H). The system further includes at least a superconductive-magnetoresistive hybrid sensor (5) including a superconductive loop having a constriction adapted to increase significantly the current density and at least a magnetoresistive sensor placed in the immediate vicinity of said constriction (72) and being separated therefrom by an insulative deposit.
    • 用于测量放置在静态外部磁场(H)中的样本(4)内的磁共振信号的系统包括用于以预定发射施加高强度射频脉冲的激励装置(1至3,6至10) 在含有样品(4)的测量区中的频率fe。 励磁装置包括调谐到预定发射频率fe并设置在样品(4)附近的激励线圈(3),以产生基本上垂直于静态外部磁场(H)的电磁场。 该系统还包括至少一个超导 - 磁阻混合传感器(5),该超导磁阻混合传感器(5)包括具有适于显着增大电流密度的收缩线的超导环路和至少设置在所述收缩部分(72)附近并与之分离的磁阻传感器 通过绝对存款。
    • 5. 发明授权
    • Method and apparatus for magnetic field measurements using a magnetoresistive sensor
    • 使用磁阻传感器进行磁场测量的方法和装置
    • US07855555B2
    • 2010-12-21
    • US11665693
    • 2005-10-17
    • Nicolas BiziereClaude FermonMyriam Pannetier
    • Nicolas BiziereClaude FermonMyriam Pannetier
    • G01R33/09H01L43/08
    • G01R33/09
    • The device for measuring magnetic field by using a magnetoresistive sensor comprises at least one magnetoresistive sensor (5), a module (50) for measuring the resistance of the magnetoresistive sensor (5), a generator module (40, 6) for generating an additional magnetic field in the space containing the magnetoresistive sensor (5), and a control unit (60) firstly for selectively controlling the generator module (40, 6) to apply an additional magnetic field pulse possessing a first value with first polarity that is positive or negative and magnitude that is sufficient to saturate the magnetoresistive sensor (5), and secondly for selectively controlling measurement of the resistance of the magnetoresistive sensor (5) by the module (50) for measuring resistance.
    • 用于通过使用磁阻传感器测量磁场的装置包括至少一个磁阻传感器(5),用于测量磁阻传感器(5)的电阻的模块(50),用于产生附加的磁阻传感器 包含磁阻传感器(5)的空间中的磁场以及首先用于选择性地控制发电机模块(40,6)以施加具有第一极性的第一值的附加磁场脉冲的控制单元(60) 足以使磁阻传感器(5)饱和的负和大小,其次用于通过用于测量电阻的模块(50)选择性地控制磁阻传感器(5)的电阻的测量。
    • 7. 发明申请
    • Device for sensing a magnetic field
    • 用于感测磁场的装置
    • US20060220641A1
    • 2006-10-05
    • US10543982
    • 2003-01-31
    • Myriam PannetierClaude FermonJuha Simola
    • Myriam PannetierClaude FermonJuha Simola
    • G01R33/02
    • G01R33/035
    • The device for sensing a magnetic field comprises a closed superconducting pick-up loop (1) having a path width (d) etched out of a single layer superconducting thin film and provided with a constriction (15) having a width (w) of narrow dimension smaller than the path width (d). The closed superconducting pick-up loop (1) constitutes a flux-to-field transformer (FFDT). At least one magnetoresistive element (2) is placed on top of or below the superconducting thin film, is isolated from the superconducting thin film by a thin insulating layer and is located so that an active part of the magnetoresistive element (2) is at the location of the constriction (15) and has a width equal to or less than the width of the constriction (15). The active part of the magnetoresistive element (2) is oriented so that the bias current in this active part is directed essentially along the constriction (15), orthogonally to the width of narrow dimension.
    • 用于感测磁场的装置包括闭合的超导拾波回路(1),其具有从单层超导薄膜蚀刻出的路径宽度(d),并设置有宽度(w)窄的收缩部(15) 尺寸小于路径宽度(d)。 闭合超导拾波回路(1)构成磁通 - 磁场变压器(FFDT)。 至少一个磁阻元件(2)被放置在超导薄膜的顶部或下方,通过薄的绝缘层与超导薄膜隔离,并且被定位成使得磁阻元件(2)的有源部分位于 狭缝(15)的位置并且具有等于或小于收缩部(15)的宽度的宽度。 磁阻元件(2)的有源部分被定向成使得该有源部分中的偏置电流基本上沿狭缝(15)指向,与窄尺寸的宽度正交。
    • 10. 发明授权
    • Device for sensing RF field
    • 用于感测RF场的装置
    • US07511483B2
    • 2009-03-31
    • US10543981
    • 2003-01-31
    • Myriam PannetierClaude Fermon
    • Myriam PannetierClaude Fermon
    • G01R33/09H01Q7/00H01Q7/06
    • G01R29/0878G01R15/205
    • The device for sensing a RF field comprises a flux-receiving loop (1) including a circumferential path having a defined path width (d), the flux-receiving loop (1) having a portion (10) that transforms the magnetic flux flowing through the flux receiving loop (1) into a high magnetic field. The portion (10) comprises a constriction of the flux-receiving loop (1) that concentrates the current lines in the circumferential path to define a current-field transformer. At least one very low noise magnetic field transducer (12) is located at a very close distance from the constriction.
    • 用于感测RF场的装置包括具有限定的路径宽度(d)的周向路径的磁通接收环路(1),所述磁通接收环路(1)具有转换流过磁通的部分(10) 磁通接收环路(1)变成高磁场。 部分(10)包括磁通接收回路(1)的收缩部,其将电流线集中在圆周路径中以限定电流场变压器。 至少一个非常低噪声的磁场换能器(12)位于与收缩部非常近的距离处。