Bi-In-Sn合金熔化温坪优化方法探索

为了提高红外遥感高精度测量水平,研发适用于红外遥感测温范围的次级固定点已成为提高在轨温度标定精度的重要手段.针对红外遥感领域涉及的温度范围(190～350 K),研制了Bi-In-Sn三元合金固定点.为提高三元合金温坪复现水平,采用预熔方法对三元合金固定点进行预处理,分析不同热工况对三元合金温坪的影响,获得适用于该三元...

Exploration of Bi-In-Sn Alloy Melting Temperature Plateau Optimization

In order to improve the high-precision measurement level of infrared remote sensing, exploring and developing secondary fixed points suitable for the infrared remote sensing temperature measurement range has become an important method to improve the accuracy of on orbit temperature calibration. Aiming at the temperature range (190~350K) involved in the field of infrared remote sensing, Bi-In-Sn ternary alloy fixed point was developed. To improve the reproducibility level of ternary alloy temperature plateau, the ternary alloy fixed point was preproccessed by the pre-melting method, and the effects of different thermal conditions on the ternary alloy temperature plateau were analyzed to obtain the reproduction method suitable for the ternary alloy fixed point. The results show that the reproducibility level of the fixed-point temperature plateau can be optimized through the proper preheating and pre-melting method. The melting temperature plateau of Bi-In-Sn alloy fixed point developed lasts for more than 7 hours, and the reproducibility is better than 1.3mK; by assigning the eutectic point of Bi-In-Sn, the temperature is 333.7318K and the expanded uncertainty is 3.0mK (k=2).