在线自动聚焦红外热像仪系统设计

Design of an Auto-focusing Infrared Thermal Imager Online System

红外热像仪具有全天候成像、环境适应性强、非接触测温等优点,被广泛应用于国民经济的各个领域。本文设计了一套可组网的自动聚焦红外热像仪系统。系统主要分为3个部分:(1)红外热像仪成像组件,包括可变焦红外成像光学镜头和非制冷红外焦平面探测器;(2)自动聚焦闭环控制组件,包括FPGA图像评价单元、电机反馈控制单元和聚焦搜索算法;(3)红外热像仪网络化监控嵌入式组件,包含视频压缩编码、私有网络控制传输协议、OSD(on-screen display)温度叠加等功能。该系统可广泛应用于港口码头、石油化工、危险品仓储等领域,并将逐步成为这些领域事故预判和报警的重要安全监控设备。

An infrared thermal imager has the advantages of all-weather imaging,environmental adaptability,and noncontact temperature measurement.It has been widely used in various fields of the national government.An auto-focusing infrared thermal imager online system was designed for this paper.The system is mainly divided into three parts:1)infrared thermal imager components,including zoom lens and imaging infrared uncooled infrared focal plane detector;2)automatic focusing closed-loop control components,including FPGA image evaluation unit with feedback control of the motor unit and a focusing search algorithm;and 3)the embedded network monitoring component containing the video compression encoding,private network control transmission protocol,and OSD(on-screen display)temperature superposition function.The system can be widely used in ports,petrochemical,dangerous goods warehousing and other fields,and will gradually become an important part of the safety monitoring equipment for accident prediction and awareness in these areas.