用于人体姿态估计传感的菲涅尔透镜设计

Fresnel lens design for human posture estimation sensing

随着虚拟现实和体感游戏的兴起,人体姿态估计越来越受到关注。针对基于热释电红外传感器的人体姿态估计系统中的菲涅尔光学微结构透镜进行设计,在分析了锥形偶次非球面的理论公式后,计算得到各级非球面系数。通过仿真分析,当材料选为聚甲基丙烯酸甲酯(PMMA),探测器采用6个敏感元面积为2×1 mm^2、视场角为100°×100°的LHI968探测器时,得到菲涅尔透镜整体尺寸为28 mm×32 mm,前表面曲率半径为43.7 mm,后表面曲率半径为45.2 mm,中心厚度为0.6 mm。最终仿真结果显示,各探测器光能利用率分别为96.70%、94.8%、96.95%、97.75%、90.65%和90.15%,可以满足对人体不同部位红外光的响应,从而实现人体姿态的精确估计。

With the rise of virtual reality and somatosensory games,the human posture estimation has received increasing attention.The Fresnel optical microstructure lens in the human posture estimation sensing system based on pyroelectric infrared sensor was designed.After analyzing the theoretical formula of the cone even aspheric surface,the aspheric surface coefficients at all levels were calculated.Through simulation analysis,when the polymethyl methacrylate(PMMA)is selected as the material and the LHI968 detector with six sensitive element area of 2×1 mm^2 as well as field angle of 100°×100°is adopted as the detector,the overall dimensions of the Fresnel lens is 28 mm×32 mm,the curvature radius of the front and back surface are 43.7 mm and 45.2 mm,respectively,and the center thickness is 0.6 mm.The final simulation results show that the light energy utilization rate of each detector is 96.70%,94.8%,96.95%,97.75%,90.65%and 90.15%,which can satisfy the response of the infrared light to different parts of the human body,so as to achieve the accurate estimation of the human posture.