用于非扫描3D激光成像的精密计时电路设计

针对目前带读出电路(ROIC)的APD阵列国内还缺乏产品的问题,设计采用一种高精度数字时间转换芯片(TDC-GP21)来测量激光脉冲在空中的飞行时间,从而得到目标的距离信息,实现高分辨率的距离图像. 利用FPGA控制时间数字转换芯片设计了非扫描3D激光成像的精密计时电路,进行了程序仿真与实验. 仿真结果表明设计的精密计时电路能够呈现出目标的距离图像. 

Design of Precision Timing Circuit for Scannerless 3D Laser Imaging

3D laser imaging includes intensity image and range image. The range image represents the depth of target, and can reflect the characteristics of the target much better, so the realization of high resolution range image is the central part of the 3D laser imaging technology. Because there are no domestic products of the APD array with the readout circuit (ROIC) currently, a high precision digital time conversion chip (TDC-GP21) was designed to measure the time of laser flying in the air, getting the distance information of the target to achieve high resolution range image. A scannerless 3D laser imaging precision timing circuit was designed, and the FPGA was taken to control time digital conversion chip. The simulation and experiment results show that the designed precise timing circuit can present a distance image of target.