电磁场中热电偶测温的热传导误差分析

THE ANALYSIS FOR THERMAL CONDUCTION ERRORS OF THERMOCOUPLE MEASUREMENT IN ELECTROMAGNETIC FIELD

肿瘤热疗过程中通常采用热电偶进行温度监测。在排除了较大的电磁干扰误差后，热传导误差（ＴｈｅｒｍａｌＣｏｎｄｕｃｔｉｏｎＥｒｒｏｒｓ）是热电偶探头在电磁加热场中测温时的主要误差来源。本文论述产生热传导误差因素，指出使用低热传导性材料、避免焊点过大、避免较大温度梯度等措施可以减小这种误差。

Thermocouples are commonly used to monitor temperature during hyperthermia.Studies in a nonelectromagnetic environment additionally confirmed that thermal conductive artifacts are the major source of temperature error.In order to minimize the thermal conduction errors, it should be use thermometers with high thermal resistance leads, avoid the steep thermal gradiants and minimize the contact point of thermocouples.