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微細平面コイルによる金属体極表面の性状検出と初期劣化の推定に関する研究

使用精细平面线圈检测金属物体极端表面特性并估计初始劣化的研究

基本信息

批准号：
11650421
负责人：
YAMADA Sotoshi
金额：
$ 1.34万
依托单位：
kanazawa University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

We discussed the feasibility of estimating physical properties (conductivity and permeability) on near-surface of metals without contact by using micro planar type coil and examined its precision by analytical and experimental tests. As a result, the measuring approach gives much information of inspecting deterioration of metallic structure. The achievements of the research project are follows,1. Fabrication of meander planar type probeWe developed the micro planar type coil of 13^*13mm area by etching techniques and made the measuring system to estimate electromagnetic properties by using impedance analyzer. It is possible to measure impedance on the frequency up to 500kHz.2. Examination the shape of the micro planar coilWe examine the pattern of the micro meander coil to improve the sensitivity of estimating conductivity. It is clear that the meander pattern with larger pitch is better to measure the object with higher conductivity and thickness. We verified the relationship by measuring conductivity by various planar coils.3. Analysis and inspection modelWe consider the 2D mode for micro meander probe and could analyze the system by the separation of variables. As a result, we can estimate the conductivity of metal as inverse problem. We can evaluate the conductivity within 30% precision by non-contact method.4. Model experiment for evaluating fatigueWe consider the compound metallic material with ceramic coating as model material. We try to estimate the conductivity of bonding agent between metal and ceramic. It is possible to estimate the conductivity by our method, then the variation of conductivity may give the information of fatigue.

讨论了利用微平面型线圈非接触地估算金属近表面物理性质（电导率和磁导率）的可行性，并通过分析和实验测试检验了其精度。因此，该测量方法提供了检查金属结构劣化的大量信息。本课题的研究成果如下： 1．曲折平面型探针的制作我们通过蚀刻技术开发了13^*13mm面积的微平面型线圈，并制作了使用阻抗分析仪来估计电磁特性的测量系统。可以测量频率高达 500kHz 的阻抗。2．检查微平面线圈的形状我们检查微曲折线圈的图案以提高估计电导率的灵敏度。显然，较大节距的曲折图案更适合测量较高电导率和厚度的物体。我们通过测量各种平面线圈的电导率来验证这种关系。 3．分析和检测模型我们考虑微蛇行探针的二维模式，并可以通过变量分离来分析系统。因此，我们可以将金属的电导率估计为反问题。采用非接触方式测量电导率，精度在30%以内。 4．疲劳评估模型实验我们以陶瓷涂层复合金属材料为模型材料。我们尝试估计金属和陶瓷之间粘合剂的电导率。通过我们的方法可以估计电导率，然后电导率的变化可以给出疲劳的信息。