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一、引言常规镍基热电偶(K型),由于工作温度范围宽,稳定性好,对各种气氛适应性强,又具有良好的抗辐照性能,所以,在中温范围的测温领域中一直占有很重要的地位.它不仅可以用于生产过程的在线测量,而且,经过严格挑选并进行单支分度后,这种热电偶可作为标准,用来检定其他工业用廉金属热电偶. 但是,在使用中已经发现,这种热电偶在200～550℃范围存在着明显的热电势反常现象,例如,在该温度范围内,这种热电偶在相同温度点的升、降温分度
I. Introduction Conventional nickel-based thermocouple (K type), due to wide operating temperature range, good stability, adaptability to various atmospheres, and has good anti-radiation properties, so in the field of temperature measurement range Has always held a very important position.It can not only be used for on-line measurement of the production process, and, after rigorous selection and single indexing, this thermocouple can be used as a standard, used to test other industrial metal thermocouples. However, in use, it has been found that this thermocouple has obvious thermoelectric potential anomalies in the range of 200-550 ° C. For example, in this temperature range, the thermocouple rises and falls at the same temperature