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首页> 外文期刊>日本磁気学会学術講演概要集 >Non-destructive inspection using acoustically stimulated electromagnetic method
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Non-destructive inspection using acoustically stimulated electromagnetic method

机译：采用声学刺激的电磁法进行无损检测

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摘要

Many steel materials exhibit hysteresis in the variation of magnetic flux density B with respect to magnetic field H. Because the hysteresis curve contains a number of independent parameters that is sensitive to factors such as stress, strain, grain size and heat treatment, they have been used in the determination of material properties in nondestructive evaluation (NDE). Although ultrasound waves can propagate through optically opaque substances, the majority of existing ultrasound techniques are restricted to determining the mechanical properties from the elasticity or mass density of a target. Recently, however, magnetic properties have been successfully measured and visualized by ultrasonic excitation. The principle of this technique is based on the generation of acoustically stimulated electromagnetic (ASEM) fields through magnetomechanical coupling. In the ASEM method, the spatial resolution of magnetic imaging is determined by ultrasound focusing, not limited to the size of magnetic sensors or the distance between the sensor and an object (lift-off). The ASEM measurement setup is shown in Fig. 1(a). An ultrasound transducer with an acoustic delay line is used for avoiding the EM noise generated by the transducer. A specimen is subjected in external magnetic fields H which is applied by a commercial electromagnetic coil. The ASEM signal emitted from a specimen is picked up through a resonant loop antenna tuned to the ultrasound frequency.
机译：许多钢材相对于磁场H在磁通密度B的变化中表现出滞后。因为滞后曲线含有许多对压力，应变，粒度和热处理等因素敏感的独立参数，因此它们已经存在用于测定非破坏性评估中的材料特性（NDE）。尽管超声波可以通过光学不透明物质传播，但是大多数现有的超声技术被限制为从目标的弹性或质量密度确定机械性能。然而，最近，通过超声波激发成功地测量和可视化了磁性。该技术的原理基于通过磁机械耦合产生声学刺激的电磁（ASEM）场。在符号方法中，通过超声聚焦确定磁成像的空间分辨率，不限于磁传感器的尺寸或传感器和物体之间的距离（剥离）。亚历测量设置如图1（a）所示。具有声延迟线的超声换能器用于避免换能器产生的EM噪声。将样品经受由商业电磁线圈施加的外部磁场H.通过调谐到超声频率的谐振环天线拾取从样本发射的归档信号。

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