介绍了红外热像仪的工作原理和测温原理，分析了影响红外热像仪测温精度的各种因素，从理论上推导了各因素的误差对测温精度影响的数学表达式，计算了不同温度条件下不同发射率材料的测温误差曲线，比较了中、长波红外热像仪在不同温度范围内的测温精度。

The principles of the working and temperature measurement for the infrared thermal imager are introduced. The factors that influence the measurement precision of the infrared thermal imager are analyzed. The mathematical expression that the error factors influence the temperature measurement is derived in theory, and the error curve under different temperature conditions for the materials with different emissivity are calculated. The temperature measurement precisions of middle infrared (MIR) and long infrared (LIR) thermal imager are compared.