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Deep Exploration of Error Sources and Compensation Strategies in Thermocouple Calibration
Source: | Author:Olivia | Published time: 2025-02-21 | 16 Views | Share:
In the field of thermocouple calibration, accurately identifying and dealing with error sources is the core task. Systematic errors often lurk. For example, the non-uniformity of thermocouple materials may stem from slight differences in the manufacturing process. Even for thermocouples of the same batch, the thermoelectric properties of different parts may vary slightly, causing the measurement results to deviate in a fixed direction. Moreover, due to long-term use in high-temperature or corrosive environments, the thermocouple wires will oxidize and corrode, changing their original thermoelectric properties and introducing errors.
To address these issues, compensation strategies have emerged. For material non-uniformity, the multi-point calibration method can be used. Multiple calibration points are selected in different temperature ranges, and a curve is fitted to more accurately describe the characteristics of the thermocouple, compensating for the errors caused by material differences. For the aging problem, on the one hand, the appearance of the thermocouple should be regularly inspected, and severely damaged ones should be replaced in time. On the other hand, a reference function is used to estimate and compensate for the change in thermoelectric potential caused by aging. The reference function is usually established based on a large amount of aging data of similar thermocouples and can effectively improve measurement accuracy, ensuring the reliability of temperature monitoring in industrial processes.