中文摘要：

作物冠层温度是其内部代谢与环境条件共同作用的结果，因此冠层温度的准确测量对于调节适宜农作物生长的环境条件具有重要意义，而红外测温是对冠层温度测量的主要方法之一。为此，从红外测温原理入手，得出探测距离是影响测温精度的因素之一。在室内环境温度一定的条件下，设计了距离对红外测温系统影响的实验。结果表明，随着探测距离的增加，测量误差逐渐增大至1．3℃，并基于此提出了距离补偿模型。经田间实验验证，测量误差减小到0．2℃以内，该修正模型有效地减弱了测量距离的影响。

英文摘要：

Crop canopy temperature is the manifestation of combined action of internal metabolism and environmental conditions.So the accurate measurement of canopy temperature has great implications for the adjustment of ambient conditions that are suitable to the growth of crop , and infrared temperature measurement is one of the main methods of canopy temperature measurement .This paper starts with the principle of infrared temperature measurement , finds that detect distance is one of the factors which affect the accuracy of temperature measurement .On the certain indoor environmental temperature , an experiment on demonstrating the influence of measurement distance on the precision of an infrared temperature measurement system is carried out .The result shows that the measured errors increase to 1 .3 ℃ gradually with the increase of the detect distance , and based on this we provide a model of distance compensation .Finally , the model of error correction turns out to be effective to weaken the effect of measuring distance , and the measured errors are below 0.2℃.