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在很多场合,没有必要测量实际温度,而只要测量相对于某一参考点的温度变化,例如被测对象与室温或壁温之间的温差,空气管道或水管入口与出口之间的温差以及液体或气体中瞬时温度变化的幅值。温差热电偶可以提高精度,因为它只放大温差信号而不放大实际温度的信号。温差热电偶也不需要冷端以及专门的延伸导线,而只需要一个指示仪表,因而降低了成本,简化了数据的处理。热电偶原理
In many cases, it is not necessary to measure the actual temperature, but to measure changes in temperature relative to a reference point, such as the temperature difference between the test object and room temperature or wall temperature, the temperature difference between the air pipe or water inlet and outlet, Or the magnitude of the instantaneous temperature change in the gas. Thermocouples can improve accuracy because they only amplify the temperature difference signal without amplifying the actual temperature signal. Thermocouples also eliminate the need for cold ends and specialized extension leads, requiring only one gauge, reducing costs and simplifying data handling. Thermocouple principle