混凝土结构物与植物叶片之红外热像侦测研究

INFRARED THERMOGRAPHY TARGET DETECTION BETWEEN CONCRETE STRUCTURE AND PLANT LEAF

红外热像仪准确量测温度的主要关键为物质的发射率.红外热像仪常用于战区侦测,但战区目标物常以植物绿化达到伪装效果.为此基于能量平衡法则,建立叶片发射率仿真模型,可用以估算叶片发射率.另外以红外热像仪分析±0.5℃微小温差环境中混凝土结构物与植物叶片之红外热影像,实验结果显示两种目标物红外热像平均温度与红外热像仪发射率参数设定值的回归直线相当接近,但两种目标物平均温度标准误差与红外热像仪发射率参数设定值的回归直线明显不同.混凝土与叶片具有不同的红外热像性质,此一发现将有助于提升红外热像仪对微小温差目标区的侦测能力.

The principal problem in which infrared thermographic measurements are concerned with is the emissivity of material. Infrared thermographic system was usually used to detect enemy on battlefields. However, landscape engineering is a common camouflage works on battlefields. Thus, according to energy equilibrium law, the leaf emissivity simulate model was set up to estimate the leaf emissivity. Further, the infrared thermographic system was used to analyze the thermography of concrete structure and plant leaf when the environmental temperature difference is within 0.5 . The experimental results show that there are approximate linear regression lines between the emissivity parameter of infrared thermographic system vs. the mean temperature of these two targets. But there are obvious different linear regression lines between the emissivity parameter of infrared thermographic system vs. standard error of mean temperature of these two targets. The different characteristic of infrared thermography between concrete structure and plant leaf will promote the detecting ability of infrared thermographic system when the environmental temperature of target area is under the slight temperature difference.