Abstract Error due to inhomogeneity is the main problem of thermocouples (TCs), e.g., during the operation of a type K TC, this error can reach 11-30 °C. Thus, metrological reliability of TCs is threatened by this error because there is a high risk of exceeding the permissible error when the temperature distribution along the TC legs changes. Such a large error, in turn, can threaten a proper operation or even safety of a measured object. A TC with controlled temperature field was proposed to cope with this error. An information-measuring system to perform proper measurements, measurement data acquisition and collection to construct mathematical models is proposed. Its property is high diurnal stability of ±(0.0025+0,002(X/XMAX–1) %. The requirements for the information-measuring system and its structure are considered in this paper. In particular, one of the key problems of such a sensor is how stable is its own temperature field under the influence of the temperature field of a measured object. The experimental studies were carried out using the developed system. They showed that the coefficient of penetration of the temperature field of the measured object is about 0.04. This allows decreasing error due to inhomogeneity by about 10-20 times.

中文翻译：

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控制温度场热电偶研究的信息测量系统

摘要 由于不均匀引起的误差是热电偶(TC) 的主要问题，例如，在K 型热电偶工作期间，该误差可达11-30 °C。因此，TC 的计量可靠性受到该误差的威胁，因为当沿 TC 腿的温度分布发生变化时，超过允许误差的风险很高。如此大的误差又会威胁到被测对象的正常操作甚至安全。提出了具有受控温度场的 TC 来应对此错误。提出了一种信息测量系统，用于执行适当的测量、测量数据采集和收集以构建数学模型。其特性是±(0.0025+0,002(X/XMAX–1) %的高昼夜稳定性。本文考虑了信息测量系统及其结构的要求。特别是，这种传感器的关键问题之一是其自身的温度场在被测物体温度场的影响下有多稳定。实验研究是使用开发的系统进行的。他们表明，被测物体温度场的穿透系数约为0.04。这允许将由于不均匀性造成的误差减少大约 10-20 倍。