摘要
退火是消除铂电阻温度计内部由于机械振动等因素带来应力的最有效手段，同时也可能改变铂电阻温度计内部铂丝的氧化状态。选用不同国家生产的4支标准铂电阻温度计，分别在600℃、500℃、450℃、420cC、350℃进行退火，研究铂电阻温度计退火后在室温下随时间的变化规律。结果表明，不同的退火温度对铂电阻温度计阻值产生不同影响，对应温度变化量可达1mK，退火后在室温下0～6h内变化显著，保持同一个热状态可有效提高铂电阻温度计的测量水平。
Annealing is the most effective means to eliminate internal stress of SPRT that is due to factors such as mechanical vibration. At the same time, it may change the internal oxidation state of platinum wire. Four SPRTs from different countries are chosen, these SPRTs are annealed at five different temperatures （600℃ ,500 ℃,450℃ ,420℃ ,350 ℃） for 4 hours to investigate their stability at room temperature after annealing. The results show that different annealing temperature can produce different effects on resistance of thermometers, equivalent to temperature changes maximum 1 mK, the water triple point resistance changed significantly in 0 to 6 hours, to keep the platinum resistance thermometer in a same thermal state can effectively improve the temperature measurement level.
出处
《计量学报》
CSCD
北大核心
2015年第1期26-30,共5页
Acta Metrologica Sinica
基金
国家自然基金(51206152)
