The surface temperature of workpieces in a multi-temperature zone sintering furnace is an important parameter to characterize the performances of a multi-temperature zone system. Due to the practical structural properties of the sintering furnace, however, the conventional way of temperature measurement cannot detect the exact surface temperature of the workpieces directly, making it difficult to control the multi-temperature zone system performances precisely. To address such an issue, this paper proposes, for the first time to the best of our knowledge, a temperature compensation algorithm based soft-measurement technique to compensate for the temperature of the measuring points. Specifically, we analyze the heat-transfer mechanism within the electric heating surface and the workpiece surface and establish a mathematical model for it first, and then calculate the radiative heat transfer coefficient between the diffuse gray surface within sintering furnace using the discrete radiation heat transfer method. Finally, the heat transfer mechanism based soft measurement technique is proposed and applied to compensate for the temperature. Both simulations and experiments with a practical sintering furnace are conducted to verify the correctness and effectiveness of the proposed temperature compensation algorithm in different cases. Results show that the proposed algorithm could help maintain the temperature difference within a range limit of ±5°, which is much better as compared with the conventional temperature measurement methods.

多温区烧结炉中工件的表面温度是表征多温区系统性能的重要参数。然而，由于烧结炉的实际结构特性，传统的测温方式无法直接检测出工件的准确表面温度，难以精确控制多温区系统的性能。针对这一问题，本文首次提出了一种基于温度补偿算法的软测量技术来补偿测量点的温度。具体来说，我们首先分析了电加热面和工件表面的传热机理，并建立了数学模型，然后采用离散辐射传热方法计算烧结炉内扩散灰面之间的辐射传热系数。最后，提出了基于传热机制的软测量技术，并将其应用于温度补偿。对实际烧结炉进行了仿真和实验，以验证所提出的温度补偿算法在不同情况下的正确性和有效性。结果表明，所提出的算法有助于将温差保持在±5°的范围内，与传统的温度测量方法相比要好得多。