Very high frequency EMAT for resonant measurement
Very high frequency EMAT for resonant measurement
复制标题
用于谐振测量的甚高频 EMAT
DOI：
10.1109/ultsym.1994.401784
复制
发表时间：
1994
期刊：
影响因子：
--
通讯作者：
K. Kawashima
中科院分区：
文献类型：
--
作者：
K. Kawashima
甚高频谐振 EMAT 技术在超过 200 MHz 的频率下进行描述，这是此类类型的甚高频室温测量。这种高频EMAT非常小，为25毫米×25毫米×40毫米，由直径20毫米的永磁体和直径3毫米的扁平圆形线圈制成。在小至 20 μm 的薄金属板上生成并检测纵波、慢波和快横波。测量了含 3% Si 的钢合金单晶（厚度 0.253 mm），并获得了独特的厚度共振。根据测量的共振频率，可以获得晶体方向。此外，还给出了粘合到大块样品上的薄片的结果。研究表明，键合的性质对共振峰高度有很大影响。使用这种技术在铝制啤酒罐沿其长度的不同位置探测壁厚。通过这些例子可以清楚地看出，高频谐振 EMAT 是一种有前途的技术，用于板材和薄片材料特性的无损测量
Very high frequency resonant EMAT technique is described at frequencies over 200 MHz which is a very high frequency room-temperature measurement of this type. This high frequency EMAT is very small, 25 mm×25 mm×40 mm, and is made from a permanent magnet with 20 mm diameter and a flat circular coil with 3 mm diameter. Longitudinal waves, slow and fast shear waves are generated and detected on thin metal sheets down to 20 μm. Single crystals of steel alloy with 3% Si are measured (thickness 0.253 mm) and distinctive thickness resonances are obtained. From the measured resonance frequencies, crystallographic direction is obtained. In addition, the results on a thin sheet bonded to a bulk sample are given. The nature of the bonding is shown to strongly influence the resonant peak heights. The wall thickness of an aluminum beer can was probed using this technique at various positions along its length. Through these examples it should be clear this high frequency resonant EMAT is a promising technique for the nondestructive measurement of material characteristics of plates and thin sheets
N.Mikoshiba：1986 年超声波研讨会（IEEE，纽约）。
DOI：
--
发表时间：
--
期刊：
影响因子：
--
作者：
通讯作者：
--