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| Exploration of Bi-In-Sn Alloy Melting Temperature Plateau Optimization |
| RUAN Yi-ming1,LING Zhong-qian1,LI Ting2,SUN Jian-ping2,WANG Hong-jun2,YIN Yue3,YANG Jin-nan1 |
1. College of Metrology & Measurement Engineering, China Jiliang University,Hangzhou,Zhejiang 310018, China
2. National Institute of Metrology, Beijing 100029, China
3. Shandong Institute of Metrology, Jinan, Shandong 250014, China |
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Abstract 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).
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Received: 16 November 2021
Published: 23 February 2022
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2022, Vol. 43 
