化石英玻璃的膨胀度在6×10-10K-1以内测量
1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
International journal of thermophysics
|October 7, 2024
概括
这项研究提出了一种新的方法,用于测量化石英玻璃的热膨胀系数,使用Fabry-Perot腔. 材料不均性显著影响化石英的热膨胀,超过24倍的测量不确定性.
科学领域:
- 材料科学 材料科学 材料科学
- 光学物理学 光学物理学
- 计量学 计量学 计量学
背景情况:
- 精确测量热膨胀系数对于用于精密光学和高温应用的材料至关重要.
- 化石英玻璃是光学元件中常见的材料,由于其低热膨胀,但其均性可能有所不同.
- 现有的测量技术可能在精度上有局限性,或者受到材料特性的影响.
研究的目的:
- 开发和验证一种精确的方法来确定化石英玻璃的热膨胀系数.
- 量化与拟议技术相关的测量不确定性.
- 研究材料不均质对化石英热膨胀系数的影响.
主要方法:
- 使用了由化石英玻璃构建的法布里-佩罗腔.
- 监测Fabry-Perot腔的共振频率变化作为温度的函数.
- 分析频率变化以计算热膨胀系数,考虑各种不确定性来源.
主要成果:
- 在测量热膨胀系数时,达到小于0.6 (nm·m-1) ·K-1 (0.15%) 的标准不确定性.
- 确定了反射相位移的温度依赖的不确定性,作为潜在的性能限制.
- 在化石英中观察到显著的材料不均性,样本间的热膨胀差异是单样样本测量不确定性的24倍.
结论:
- 开发的法布里-佩罗特共振频率方法提供了非常准确的测量化石英的热膨胀.
- 材料不均性是影响化石英有效热膨胀系数的关键因素,需要仔细选择样本或平均值.
- 进一步提高测量精度将需要解决薄膜涂层特性和其他有助于因素的不确定性.
相关概念视频
01:27Thermal expansion and Thermal stress: Problem Solving
San Francisco's Golden Gate Bridge is exposed to temperatures ranging from -15 °C to 40 °C. At its coldest, the main span of the bridge is 1275 m long. Assuming that the bridge is made entirely of steel, what is the change in its length between these temperatures?
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
To solve the problem, first, identify the known and unknown quantities. The initial length (L) of the bridge is 1275 m, the coefficient of linear expansion (α) for steel is 12 x 10-6/°C, and the change in temperature (ΔT) is 55 °C.
01:11Glassware Calibration
Accurate calibration of glassware, such as volumetric flasks, pipettes, and burettes, is essential to ensure accurate measurements in the analytical laboratory. Calibration helps maintain consistency across measurements and prevents errors arising from inaccurate volumes.
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...
Volumetric flasks: Volumetric flasks are designed to prepare aqueous solutions of precise volumes accurately with a calibration line on the neck. To calibrate a volumetric flask, it is important to fill it with distilled...