概括
这项研究展示了先进的特拉赫兹 (THz) 成像技术,用于检测 (SiR) 高压电缆绝缘体中的微小100微米缺陷. 这种非破坏性的方法实现了前所未有的分辨率,提高了电源电缆的可靠性.
科学领域:
- 材料科学 材料科学 材料科学
- 电气工程 电气工程
- 非破坏性测试 不破坏性测试
背景情况:
- 高压电源电缆依赖于绝缘完整性,特别是在接头和终端, (SiR) 是一种常见的材料.
- 内部缺陷,如空气空隙和SiR绝缘中的水分,会损害性能并导致故障.
- 现有的非破坏性评估方法在聚合物绝缘体的分辨率,安全性或现场适用性方面存在局限性.
研究的目的:
- 为了证明基于固体浸泡镜头的特拉赫兹 (THz) 时间域光谱系统在散装SiR绝缘中可视化内部缺陷的能力.
- 为了在聚合物绝缘体内实现深度和侧面方向同时检测100微米小的地下缺陷.
- 评估THz成像对各种深度空洞的检测极限,并研究其用于成像层次缺陷的潜力.
主要方法:
- 使用基于固体浸泡镜头的特拉赫兹 (THz) 时域光谱系统进行非接触式高分辨率成像.
- 在SiR样本中研究了在深度和侧面尺寸上检测到大小小小到100微米的人工空隙缺陷的检测.
- 在高达1毫米的深度检查了缺陷的成像,并描述了由空隙和金属入组成的多层缺陷.
主要成果:
- 在SiR绝缘表面附近的深度和横向方向上成功可视化了小于100微米的空隙缺陷.
- 检测到100微米厚的空洞缺陷,侧面直径为数百微米,深度高达1毫米.
- 拍摄了一层层的缺陷,清楚地解决了位于空隙之外的金属入,这在传统的超声波测试中是不可能的.
结论:
- 基于固体浸泡镜头的THz-TDS系统能够高分辨率可视化SiR绝缘中的小型地下缺陷,同时实现100微米的深度和横向分辨率.
- 这种THz成像技术在检测高压电缆绝缘的关键缺陷方面比传统方法具有显著的优势,包括对水分和分层结构的敏感性.
- 这些发现为加强电力电缆组件的非破坏性评估铺平了道路,提高了可靠性并防止了能源传输基础设施的故障.
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