公开(公告)号：US07146866B2

公开(公告)日：2006-12-12

申请号：US10973011

申请日：2004-10-25

申请人： Donald T. Morelli ,  Bruno Lequesne ,  Larry M. Oberdier ,  Thomas A. Baudendistel

发明人： Donald T. Morelli ,  Bruno Lequesne ,  Larry M. Oberdier ,  Thomas A. Baudendistel

IPC分类号： G01L1/12

CPC分类号： G01L1/127 ,  G01L1/125

摘要： A magnetostrictive strain sensor (10) includes a magnetostrictive core (12) comprising a magnetostrictive material, such as a nickel-iron alloy, able to conduct a magnetic flux and whose permeability is alterable by application of a strain. A conductive coil (14) is proximate the magnetostrictive core (12) to generate the magnetic flux when electrically excited. A shell (16) surrounds the conductive coil (14) and the magnetostrictive core (12) for providing a conductive return path for the magnetic flux. An excitation source (18) is electrically connected to the conductive coil (14) for electrically exciting the conductive coil (14) with an alternating current having a constant magnitude. An in-phase voltage circuit (22) is electrically connected across the conductive coil (14). The in-phase voltage circuit (22) senses an in-phase voltage that is in-phase with the alternating current. The in-phase voltage varies correspondingly to the strain subjected to the magnetostrictive core (12). A processor (24) is operatively connected to the in-phase voltage circuit (22) to determine the strain applied to said magnetostrictive core (12) by comparing the in-phase voltage to a predetermined relationship between strain and in-phase voltage.

摘要翻译： 磁致伸缩应变传感器（10）包括磁致伸缩芯（12），其包括能够传导磁通并且通过施加应变可改变磁通量的磁致伸缩材料，例如镍 - 铁合金。 导电线圈（14）靠近磁致伸缩芯（12）以在电激励时产生磁通量。 外壳（16）围绕导电线圈（14）和磁致伸缩芯（12），用于为磁通提供导电返回路径。 激励源（18）电连接到导电线圈（14），用于以具有恒定大小的交流电激励导电线圈（14）。 同相电压电路（22）跨导电线圈（14）电连接。 同相电压电路（22）感测与交流电同相的同相电压。 同相电压对应于经受磁致伸缩芯（12）的应变而变化。 处理器（24）可操作地连接到同相电压电路（22），以通过将同相电压与应变和同相电压之间的预定关系进行比较来确定施加到所述磁致伸缩芯（12）的应变。