CN101002087A - 挠性电磁声学换能传感器 - Google Patents
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Abstract
由挠性部件和材料所设计的磁体阵列可以轻易地定形为配合各种弯曲表面和结构的外形。除了挠性外,结合这些磁体的EMAT在体积上小于传统的EMAT磁体,因此更容易地用于进入会受到限制的复杂结构。此外,该挠性磁体阵列还能以各种形状和配置轻易并且经济地制造,从而与刚性的传统磁体设计相比,增加了多用性、用途和成本效应。
Description
技术领域
包括挠性磁体的电磁声学换能器(EMAT)能与其所加到的物体表面一致(conform to),由此与由刚性而昂贵的部件所组成的传统EMAT设计相比以降低的制造成本提供优越的性能。
背景技术
电磁声学换能器(EMAT)是能在无需与材料接触的情况下在导电材料中发射和接收声波的电气装置。因为声波从诸如裂缝和空隙这类缺陷反射,EMAT一般用作探伤装置。主要通过EMAT设计及EMAT部件的电励磁确定由EMAT发射和接收的声波的特性,包括频率、强度、方式和波束形状。
EMAT在与压电换能器相比时具有几个优点。不同于声波在探头中产生并通过如油或水这类耦合介质传递到材料中的压电换能器,EMAT不需要任何流体耦合。EMAT能以较高的速度进行探伤,因而当将其用在在自动探伤系统中时能提供较高的容许能力。由于EMAT在被测材料表面的紧下方产生声波,它们为材料被污染、汹涌、加热到高温或高速移动的各种应用提供较高的精确度、可靠性和可重复性。因为EMAT的制造可以非常精密,EMAT或其部件能互换,同时特性或性能的变化最小。EMAT的简单构造提供几乎无限的设计类型来便于定型、控制和聚焦波束以实现所需要的声学效应。
EMAT通常由二个基本部件组成:磁体和绝缘导体线圈。无论永磁体还是电磁体(磁体)都用来产生穿入被测材料部件表面的磁场。由导体组成的线圈,通常被称为RF线圈,放置在磁体和测试材料之间。这些RF线圈用来在测试材料中感应高频磁场。来自磁体的场和来自RF线圈的场之间的相互作用在测试材料的原子或分子晶格内产生作用力。这些作用力的强度和方向随时间以RF线圈中电流相等的频率变化。这些振荡作用力产生通常在测试材料里沿着两个相反方向远离EMAT传播的声学波或声波。
图1所示的是用来产生垂直偏振切变(SV)波、兰姆波和表面波的EMAT配置,所述这些波又被称为雷利波。磁体1产生与测试中的金属部件或测试材料3垂直的磁场2。显示为但不局限于由绝缘导体组成的曲折线圈的曲折射频(RF)线圈4由交流电源5供能并产生在其端子之间在RF线圈4内流动的交流电流6。交流电流6产生交变场7,而交变场7环绕涡电流8并穿入测试材料3的表面。穿入的交变场7在测试材料3的表面中或附近感应出交变涡电流8。同样,还在测试材料3中产生环绕涡电流8的交变磁场9。来自涡电流8的交变场7和来自磁体1的交变磁场9相互作用以在测试材料3中并在各RF线圈4下面的产生洛伦兹力10。这些洛伦兹力10产生声波,例如水平偏振切变波,而该声波为超声波或本领域通常称为SH波11的声波并在测试材料3中从EMAT沿着相反的方向传播。
图2所示的是使用诸如永磁体阵列的磁体阵列和环绕RF线圈4以产生SH波11的EMAT。部分RF线圈4在磁体阵列12的下面,并且还紧靠着测试材料3。当RF线圈4接上交流电源5时,在测试材料中感应出涡电流8及其相关的交变磁场9。来自磁体12的磁场2和来自涡电流8的交变场7的相互作用在测试材料3中产生洛伦兹力10,而该洛伦兹力10靠近并且还平行于测试材料3的表面。这些洛伦兹力10产生在测试材料3中沿着相反方向传播的SH波11。
图3所示的是使用诸如电磁体之类的磁体1和RF线圈4以便在具有磁致伸缩属性的某些铁磁材料14中产生SH波11的EMAT。由绝缘导体组成的磁体线圈13绕在铁磁材料芯14上。当电源15激励磁体线圈13时,瞬态电流16在磁体线圈13的端子之间流动。瞬态电流16转而产生切向磁场17,部分切向磁场17穿入测试材料3的表面。切向磁场17感应出在磁体1的磁极下以及周围流动的瞬态涡电流18。
以频率高于磁体线圈13的瞬态电流16的组成频率的交流电流6对RF线圈4励磁。RF线圈4中的交流电流6在测试材料3中感应出交变涡电流8及其相关的磁场9。在测试材料3呈现磁致伸缩物理属性时,RF线圈4感应出的总磁场9与磁体1感应出的切向磁场17的矢量和将造成测试材料3的膨胀和收缩。测试材料的交替膨胀和收缩将导致SH波11从EMAT沿着两个方向传播。
发明内容
由挠性部件和材料所设计的磁体阵列可以轻易地定形为配合各种弯曲表面和结构的外形。除了挠性外,结合这些磁体的EMAT在体积上小于传统的EMAT磁体,因此更容易地用于进入会受到限制的复杂结构。此外,该挠性磁体阵列还能以各种形状和配置轻易并且经济地制造,从而与刚性的传统磁体设计相比,增加了多用性、用途和成本效应。
提供一种适于与非平面测试衬底的表面一致的电磁声学换能器。
在某些实施例中,该电磁声学换能包括一个可与非平面测试衬底表面相一致的磁体阵列,其中:该磁体包括磁极和互连段。
在一个实施例中,磁体阵列包括包含铁磁材料颗粒的挠性化合物,其中在导电时能产生垂直于各磁极面的磁场的导体设置在磁极之问。
在另一个实施例中,磁体阵列包括包含永磁材料的颗粒的挠性化合物,其中磁极可以选择性磁化,以提供与各个磁极面垂直的静态磁场。
提供了一种使用电磁声学换能器询问具有非平面表面的测试衬底的方法,其包括:
在表面的监控距离内使电磁声学换能器与测试衬底的表面一致;
通过来自电磁声学换能器磁体和导体的场的相互作用产生声波;
检测由测试衬底所反射的声波的至少一个特性。
附图说明
图1显示了包括用于在导电材料中产生和检测SH波、兰姆波和表面波的永磁体和RF线圈的EMAT;
图2显示了包括用于产生和检测水平极化切变波的永磁体阵列和RF线圈的EMAT;
图3显示了包括用于在呈现磁致伸缩属性的铁磁材料中产生水平极化SH波的电磁体和曲折RF线圈的EMAT;
图4显示了适合于在非平面导电材料中产生和检测SH波的挠性EMAT;
图5显示了包括以机械和磁方式连接的磁极片的挠性多极磁体阵列和包括RF线圈分布式的导体绕组;
图6显示了紧靠着挠性多极磁体阵列的磁极面放置的挠性RF线圈;
图6A显示了与图6的阵列中的磁极面的相关涡电流和磁场;
图7显示了嵌入挠性磁体阵列的磁极面的挠性RF线圈;
图7A显示了沿图7的A-A’线的嵌入式RF线圈导体的剖面。
具体实施方式
电磁声学换能器(EMAT)在制造时或之后能轻易地定形,以使该EMAT能够用来在没有严重损失对部件和结构的缺陷和属性的信号响应的情况下询问具有弯曲表面的部件和结构,相反,EMAT对测试材料表面的顺从性不足往往会造对信号响应造成相当大的损失。EMAT基本上有两个部分:磁体和提供RF信号的导体,如RF线圈。磁体可以由铁磁材料和导体的一个或多个磁芯构成。
公开了一种EMAT,其包括包含与提供RF信号的导体(例如,RF线圈)设计、制造并集成的材料的磁体或挠性多极磁体阵列。该EMAT在制造时或之后能轻易地定形,以使其可用于询问具有弯曲表面的部件和结构。这将显著地减少由于顺从性不足所造成的对这些部件和结构的缺陷或属性的信号响应损失,并减小EMAT到测试材料或基底表面的距离。
挠性多极磁体阵列可以成行制造,其中各行绕一点或数点具有一定的曲率半径,以使所生成的SH波在测试材料部件中聚焦。磁体阵列的相邻磁极之间的距离有所变化,该变化是距焦点的径向距离的函数。磁体阵列中的这种变化使SH波的垂直宽度改变。在其他实施例中,分别具有不同径向距离的两个或更多个磁体阵列可以前后排列在磁极之间,使得它们在规定的频率范围内工作时具有大致相同的SH波角和焦点。在又一个实施例中,磁体阵列可以具有嵌入在凹槽中的高频(RF)导体,该凹槽跨越磁极面并与焦点的径向投影共线。
挠性多极磁体阵列可以包括磁体和至少部分用含有铁磁材料(例如铁)或永磁材料(如钕铁硼)的颗粒的挠性材料(例如,硅橡胶)制造的磁极的阵列。
导体可以具有一定形状、宽度和厚度,以使它们能安装在磁极之间并由电流供能,以便在相邻的磁极之间产生交变磁极性。在其他实施例中,导体可以有一定形状、宽度和厚度,以使导体能安装在多层串联的磁极之间并电供能,以便在相邻的磁极之间产生交变磁极性。
图4所示的是可以与本领域公知的其它电气部件一起使用以便在弯曲金属部件(例如但不限于钢管20)内产生SH波的EMAT的顺从(conformable)、挠性的多极磁体阵列19。磁体1包含磁极21和互连连接件或互连段,两者均可以由铁磁或非铁磁材料构成。挠性多极磁体阵列19可以制造或组装为使其与EMAT需要施加到其上进行所需测试的材料结构的曲率一致。
一种制造挠性多极磁体阵列的方法是,模塑浸渍或填充铁磁材料颗粒14(例如但不限于铁)的顺从、挠性的化合物,例如但不限于硅橡胶。在这个实施例中,至少一个包括绝缘导体构成的RF线圈4安装在磁极21之间,以便在RF线圈4由电流供能时产生垂直于磁极21的各个面的磁场2。
在另一个实施例中,顺从、挠性的化合物浸渍有永磁材料14,例如但不限于钕铁硼。在这个实施例中,磁极21可以在使用前进行磁化,以提供垂直于磁极21各个面的静态磁场2。
图5所示的是可以与其它电气部件一起使用以产生SH波11的挠性多极磁体阵列19的平面图。它部分由北(N)和南(S)磁极21的阵列构成,该阵列通过磁性材料(未图示)的连杆以机械方式和磁方式进行连接。这样的实施例使用浸渍有铁磁材料或永磁材料颗粒,例如分别为铁化合物和钕铁硼化合物的挠性含碳氢化合物的材料,例如但不限于合成橡胶(例如硅橡胶)。这种混合物可以按各种配置模塑成包括一个或多个磁极21的挠性多极磁体阵列19,由此增强EMAT的性能,包括增加的SH波11强度、SH波11控制和聚焦。
挠性多极磁体阵列19可以包括编织在磁体21之间的绝缘导体22和第二绝缘导体23层,以使它们在具有垂直于磁极21的面和测试材料3的表面的主磁场矢量分量的方向上产生磁化。绝缘导体层22和第二绝缘导体层23可以按照在绝缘导体层22和第二绝缘导体层23由电流源27供能时在邻近的磁极21产生相反极性的图案设置在磁极21之间。在挠性多极磁体阵列用作永磁体阵列时,绝缘导体层22和第二绝缘导体层23可以不存在或去除,以增加对测试材料3表面的挠曲性和一致性。
磁体的组装可以包括在磁极之间插入绝缘导体层22、接着插入部分覆盖在绝缘导体层22上的第二绝缘导体层23。当绝缘导体层22和第二绝缘导体层23在接点24电连接时,挠性多极磁体阵列19的内部磁极21由两个由电流源27在端子25、26处供能时沿着相同方向传送电流的相互编织的绝缘导体(绝缘导体层22和第二绝缘导体层23)有效环绕,在一个实施例中该电流源是直流电流源。与绝缘导体层22和第二绝缘导体层23类似附加导体层对可以安装在绝缘导体层22和第二绝缘导体层23上并与所述层串联或并联,以提供增加的磁化电流和增加的垂直于磁极21各个面的磁场。
如图5所示,可以对磁极21的阵列进行定形和定位以使它们以近似径向距离28共同产生聚焦SH波11。各个磁极21的宽度29可以是距焦点32的径向距离28的函数,与距磁体1的中心的径向距离28成比例地增加。磁极之间的距离30连同RF线圈4的励磁频率一起确定SH波11相对测试材料3表面的法线方向的角度。在工作范围里,减少距离30或降低RF励磁频率将造成SH波11相对测试材料3(即测试衬底)的表面的角度的增加。
相邻磁极21之间的距离30以径向距离28的函数形式变化使得SH波11的垂直宽度的改变。例如,两个磁极21之间的距离与到该磁极21对的径向距离28成比例地减小会导致SH波11的垂直宽度减少和检测缺陷的分辨率增大。同样,分别在磁极21之间具有不同径向距离的两个或两个以上的挠性多极磁体阵列19可以前后排列以使它们在规定的频率范围里工作时具有近似相同的焦点32。
图6所示的RF线圈4由附着到电绝缘材料的挠性衬底31的导体构成。RF线圈4附着到磁极21的面上,以使它们紧靠着测试材料3。当交流电源5的交流电压加到RF线圈4上时,当电压在图6和图6A所示的方向上为正的瞬间,洛伦兹力10加到测试材料3上。在各列磁极21的上下相邻磁极21之间,洛伦兹力10处于径向相反方向。这应归因于相邻磁极21的相反极性。随着感应涡电流8及其相关的磁场9在相邻各列磁极21下反向,在给定行的磁极21中,洛伦兹力10处于相同方向。这些交变作用相加产生朝着焦点32传播的SH波11。
多极电磁体阵列19的磁极21可以保证增加RF导体33到测试材料的电磁耦合。如图7所示,通过将RF导体33嵌入在铁磁材料14的磁极21内能进一步增强这种电磁耦合。如图7A所示,嵌入的RF导体33和磁极21可以更靠近测试材料3,因而增加穿入测试材料3的交变磁场量。由交变场7感应的感应涡电流8的振幅增加,这转而增加洛伦兹力10的强度和测试材料中的总SH波11。
应该理解本发明所描述的实施例只是示范性的,并且所属领域的普通技术人员可以在不偏离本发明的精神和范围情况下进行许多变化和修改。所有这些变化和修改倾向于包括在如本申请所描述的本发明的范围内。应该理解所述的实施例不仅可进行选择而且还能组合。
Claims (20)
1.一种适于和非平面测试衬底的表面一致的电磁声学换能器。
2.根据权利要求1所述的电磁声学换能器,其特征在于:包括可与所述非平面测试衬底的表面一致的挠性多极磁体阵列,其中,所述磁体包括磁极和互连段。
3.根据权利要求2所述的电磁声学换能器,其特征在于:所述挠性多极磁体阵列包括包含铁磁材料颗粒的挠性化合物,其中,至少一个在导电时能产生垂直于各所述磁极面的导体设置所述磁极之问。
4.根据权利要求3所述的电磁声学换能器,其中,至少一层导体设置在所述磁极之间,以沿着具有垂直于所述磁极面和所述测试材料表面的主磁场矢量分量的方向产生磁化。
5.根据权利要求4所述的电磁声学换能器,其特征在于:所述导体以在所述导体导电时在邻近的磁极内产生相反极性的图案设置在所述磁极之间。
6.根据权利要求4所述的电磁声学换能器,其特征在于:第二导体层至少部分地覆盖在所述至少一层导体层上,并与其电连接,其中,所述导体和所述第二导体之内的磁极由两个在导电时沿着相同方向传送电流的导体有效地环绕。
7.根据权利要求6所述的电磁声学换能器,其特征在于:至少一对附加导体层设置在所述至少一层导体层和所述第二导体层上并与与所述导体层串联或并联。
8.根据权利要求2所述的电磁声学换能器,其特征在于:所述挠性多极磁体阵列包括含有永磁材料的颗粒的挠性化合物,其中,所述磁极被选择性磁化,以产生与各磁极面垂直的静态磁场。
9.根据权利要求2所述的电磁声学换能器,其特征在于:包括:一个挠性多极磁体阵列,其中,所述磁极以多行设置,其中,各行绕能够将产生的声波聚焦在所述测试衬底中的至少一个焦点具有曲率半径。
10.根据权利要求9所述的电磁声学换能器,其特征在于:相邻磁极的距离是距所述焦点的径向距离的函数。
11.根据权利要求9所述的电磁声学换能器,其特征在于:包括:至少二个前后排列的挠性多极磁体阵列,其中,各阵列的磁极之间的径向距离不同,而焦点大致相同,其中,所述至少二个阵列能产生大致相同的声波角。
12.根据权利要求9所述的电磁声学换能器,其特征在于:所述挠性多极磁体阵列具有嵌入在凹槽中的RF导体,所述凹槽跨越所述磁极面并和所述焦点的径向投影共线。
13.根据权利要求2所述的电磁声学换能器,其特征在于:所述磁体包括铁。
14.根据权利要求8所述的电磁声学换能器,其特征在于:所述磁体包括钕铁硼。
15.根据权利要求3所述的电磁声学换能器,其特征在于:所述挠性化合物是合成橡胶。
16.根据权利要求15所述的电磁声学换能器,其特征在于:所述合成橡胶包括硅橡胶。
17.根据权利要求8所述的电磁声学换能器,其特征在于:所述挠性化合物是合成橡胶。
18.根据权利要求17所述的电磁声学换能器,其特征在于:所述合成橡胶包括硅橡胶。
19.一种根据权利要求1所述的电磁声学换能器询问具有非平面表面的测试衬底的方法,包括:
在表面的监控距离内使所述电磁声学换能器与所述测试衬底的表面一致;
通过来自所述电磁声学换能器磁体和所述导体的场的相互作用产生声波;
检测由所述测试衬底所反射的声波的至少一个特性。
20.一种利用权利要求2至18任意一项权利要求所述的电磁声学换能器询问具有非平面表面的测试衬底的方法,包括:
在表面的监控距离内使所述电磁声学换能器与所述测试衬底的表面一致;
通过来自所述电磁声学换能器磁体和所述导体的场的相互作用产生声波;
检测由所述测试衬底所反射的声波的至少一个特性。
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- 2005-07-20 KR KR1020077001562A patent/KR100954308B1/ko not_active IP Right Cessation
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Also Published As
Publication number | Publication date |
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ZA200700224B (en) | 2008-05-28 |
NZ552605A (en) | 2009-01-31 |
BRPI0513738A (pt) | 2008-05-13 |
EP1774310A4 (en) | 2012-04-25 |
AU2005269701A1 (en) | 2006-02-09 |
JP5129566B2 (ja) | 2013-01-30 |
EP1774310A2 (en) | 2007-04-18 |
MX2007000807A (es) | 2007-05-23 |
AU2005269701B2 (en) | 2008-08-21 |
US7165453B2 (en) | 2007-01-23 |
WO2006014714A2 (en) | 2006-02-09 |
JP2012123019A (ja) | 2012-06-28 |
CA2573029C (en) | 2009-12-22 |
RU2369865C2 (ru) | 2009-10-10 |
JP2008507697A (ja) | 2008-03-13 |
CA2573029A1 (en) | 2006-02-09 |
WO2006014714A3 (en) | 2006-08-10 |
KR100954308B1 (ko) | 2010-04-21 |
CN100575944C (zh) | 2009-12-30 |
US20060027022A1 (en) | 2006-02-09 |
KR20070051256A (ko) | 2007-05-17 |
RU2007102488A (ru) | 2008-09-10 |
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