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一个使用光纤干扰仪的高分辨率度计
Xin Qin1,2, Guoxin Cao3,4, Mengqiao Geng1,2
1International Center for Quantum Materials, Peking University, Haidian, Beijing 100871, China.
The Review of scientific instruments
|May 23, 2024
概括
我们使用全纤维迈克尔森干扰仪开发了一个冷差异扩张仪. 这种高分辨率的仪器精确地测量了薄而脆弱的材料中的热膨胀,有助于凝聚物质物理学研究.
科学领域:
- 凝聚物质物理学 凝聚物质物理学
- 材料科学 材料科学 材料科学
- 低温工程 低温工程是什么?
背景情况:
- 精确测量热膨胀对于理解材料中的相位过渡至关重要.
- 现有的扩展测量技术往往缺乏研究薄或脆弱样本所需的分辨率或灵敏度.
研究的目的:
- 推出一种新的,高性能的差分扩展仪,能够进行冷操作.
- 在测量长度变化 (δL/L) 和温度方面实现超高分辨率.
主要方法:
- 使用全纤维迈克尔森干扰仪进行精确的,无接触的长度变化检测.
- 使用现场温度计进行准确的样本温度监测.
- 在冷温度下运行系统,以研究相位过渡.
主要成果:
- 在相对长度变化 (δL/L) 中达到10-10的分辨率.
- 证明了子皮科米长度变化分辨率和毫克尔文温度分辨率.
- 成功测量了在BaFe2As2.2的反铁磁转换附近的线性热膨胀系数.
结论:
- 开发的扩散计是研究凝聚物质物理学中相变的强大工具.
- 由于高分辨率和无接触性质,为脆弱材料 (厚度小于100微米) 提供了显著的优势.
- 原型设计允许进一步改进和与同步测量进行集成.
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