An Apparatus for High-Precision Helium Diffusion Measurements from Minerals
An Apparatus for High-Precision Helium Diffusion Measurements from Minerals
复制标题
高精度矿物氦扩散测量装置
DOI：
10.1021/ac9813078
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发表时间：
1999
影响因子：
7.4
通讯作者：
Victor E. Nenow
中科院分区：
文献类型：
--
作者：
K. Farley;P. Reiners;Victor E. Nenow
我们描述了一种简单和低成本的真空氦扩散测量装置，与传统的电阻炉技术相比，它减少了温度梯度、设定点超调和斜坡时间。样品被一根细导线悬浮在真空室中，由铝涂层投影仪灯泡通过蓝宝石视孔发出的辐射加热。由于被加热的样品包的总质量很小（通常< 100mg），热梯度和热惯性都很小。在设定点在100到750°C之间的实验中，该装置可以在~ 90秒内从室温达到设定点，通常<3°C的设定点超调只持续几秒钟。氦气扩散系数测量间接表明温度精确，可重复性优于±2°C。
We describe a simple and low-cost apparatus for in-vacuum helium diffusion measurements that reduces temperature gradients, set point overshoot, and ramping times compared with conventional resistance furnace techniques. The sample, suspended by a thin wire in a vacuum chamber, is heated by radiation from an Al-coated projector bulb passed through a sapphire viewport. Because the total mass of the sample package being heated is small (typically <100 mg), thermal gradients and thermal inertia are both small. In experiments with set points between 100 and 750 °C, this apparatus can achieve set point from room temperature in ∼90 s, usually with <3 °C of set point overshoot persisting for just a few seconds. Helium diffusion coefficient measurements indirectly indicate that temperatures are precise and reproducible to better than ±2 °C.