量热技术在铷光谱灯中的应用研究

铷光谱灯是铷原子钟的核心部件。在铷光谱灯的研制中差式扫描量热技术（DSC）是不可或缺的测量手段和研究方法之一。本文通过对长期老化跟踪测量的铷量消耗数据拟合，得到了目前使用的铷灯的铷量消耗模型。分析结果显示：铷与灯泡内的杂质反应消耗了约37.5μg金属铷，铷的消耗率稳定在0.23μg/hr，预计10年使用寿命期内铷的消耗量约106μg。铷熔融曲线的熔点和纯度测量结果显示：铷的熔点和纯度在老化开始前2个月变化明显，具有较好的相关性。老化6个月以后铷的熔点和纯度从老化开始前的36℃和99.56％提高到39.5℃和99.84％，并趋于稳定，其变化趋势与老化初期铷量的消耗规律较好地吻合。

The Application Study of Differential Scanning Calorimetry Technique in Rubidium Discharge Lamp

The rubidium（ Rb） spectral lamp is the critical component of Rb gas cell atomic frequency standard. As a measuring tool and research method the differential scanning calorimetry technique was indispensable in the manufacture of rubidium spectral lamp. Through fitting the rubidium consumption data obtained by Long-term tracing measurement,the consumption model of a rubidium spectral lamp used currently was established. The analysis result shows that the reactive loss of Rb consume about 37. 5μg metal rubidium,The speed of rubidium consumption maintain constant at 0. 23 microgram per square root of hour. The predicted total rubidium consumption in the ten years lifetime is about 106μg. The measurment result of melting point and purity of rubidium in lamp show that in the first two months,the melting point and purity change sharply with close relativity. After six months aging time,the melting point and purity of rubidium reach at 39. 5℃ and 99. 8% from initial 36℃ and 99. 5% which is fit to the trend of rubidium consumption.