在外场应用环境中，红外道面温度遥测系统的自身温度会发生较大幅度的变化，引起的内部杂散辐射变化会导致较大的系统测量误差。设计了采用双窗口红外探测器的红外道面温度遥测系统，同时对目标物辐射和内部杂散辐射进行实时测量，并在考虑探测器温度效应的基础上，建立了扣除内部杂散辐射影响的道面温度计算模型；标定实验结果表明：当探测器工作温度和测量目标温度分别在?10~40 ℃、?10~60 ℃范围时，探测器温度效应和辐射定标函数均可以做线性化处理，并呈线性叠加效果，验证了道面温度计算模型的合理性；经过标定后，红外道面温度遥测系统与Pt100接触式温度传感器进行了外场比对测试，得到测量系统与Pt100接触式温度传感器的测量数据相关性达到98.7%，其中夜间测量误差低于2.78%，表明了系统可在环境温度变化的外场条件下准确测量道面温度。

In the environment of out-field application, the temperature of the infrared remote measuring system of road surface temperature would change greatly, and the changes of the internal stray radiation thereby caused can lead to great systematic measurement error. So, infrared remote measuring system of road surface temperature based on dual window infrared detector was designed to measure the target object radiation and the internal stray radiation in real-time; meanwhile, based on the temperature effect of the detector, road surface temperature calculation model was established by eliminating the influences of internal stray radiation. The results of the calibration test show that when the working temperature of the detector and the measured target temperature are within -10-40 ℃, -10-60 ℃ respectively, the temperature effect and the radiometric calibration function can be processed linearly, showing linear superposition effect, which verifies the rationality of the road surface temperature calculation model. After calibration, out-field comparison test was conducted on infrared remote measuring system of road surface temperature and Pt100 contact temperature sensor, and it was obtained that the correlation between the measurement system and the measured data of Pt100 contact temperature sensor was up to 98.7%, among which the measurement error at night was lower than 2.78%, suggesting that the proposed system can measure the road surface temperature under out-field condition with changing environmental temperature.