基于热释电探测器的人体红外感应单元设计
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摘要
针对现有的人体定位系统中红外感应单元探测距离小、信号处理复杂等问题,提出了一种基于热释电探测器的红外感应单元。通过锗窗口光学透镜对热释电探测器进行调制,减小感应视场角度,提高感应方向性和抗干扰能力,设计信号调理电路对输出信号进行放大滤波。采用锥形外形结构增强聚焦能力,拉长探测距离,便于实现大范围定位。实验结果表明红外感应单元的最远探测距离达到45 m,并绘制了红外感应单元的感应视场图。
Aiming at the problems of small detection distance and complex signal processing of the infrared sensor unit in the existing human positioning system,an infrared sensor unit based on pyroelectric detector was proposed.Through germanium window optical lens,the pyroelectric detector was modulated to reduce the angle of induced view and improve the directionality of induction and anti-interference ability.The signal conditioning circuit was designed to amplify and filter the output signal.Conical shape structure was designed to enhance the focusing ability to extend the detection range for wide range of positioning.Experimental results show that the farthest detection distance of the infrared sensing unit reaches 45 m,the infrared induction field of view of the induction unit is drawn.
Aiming at the problems of small detection distance and complex signal processing of the infrared sensor unit in the existing human positioning system,an infrared sensor unit based on pyroelectric detector was proposed.Through germanium window optical lens,the pyroelectric detector was modulated to reduce the angle of induced view and improve the directionality of induction and anti-interference ability.The signal conditioning circuit was designed to amplify and filter the output signal.Conical shape structure was designed to enhance the focusing ability to extend the detection range for wide range of positioning.Experimental results show that the farthest detection distance of the infrared sensing unit reaches 45 m,the infrared induction field of view of the induction unit is drawn.
引文
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[2] 薛召军,赵鹏飞,万柏坤,等.红外热成像在步态识别中的应用[J].光电子·激光,2009,20(3):402-405.
[3] SUK L,KYOUNG N H,KYUNG C L.A pyroelectric infrared sensor based indoor location aware system for the smart home[J].Consumer Electronics,2006,52( 4):1311 1317.
[4] FLANNERY L J,MILLER J E.Status of Uncoiled Infrared Imagers [J].SPIE,1992,189-199.
[5] 杜文略.基于热释电红外探测器的人体方位及动作形态检测系统设计[D].太原:中北大学,2016.
[6] 孟琳.基于多角度热释电红外信息的人体身份认证研究[D].天津:天津大学,2010.
[7] AKYILDIZ I F,SU W,SANKARASU B Y,etal.Wireless sensor network[J].A survey.Computer Networks,2002,38(4):393-422.
[8] WANG S,CHEN Y W,XU M,et al.Research of passive infrared wireless sensor network target tracking[J].Journal of Transduction Technology,2008,21(11):1929-1934.