三维成像用128×2线性模式APD焦平面探测器设计

A Design of 128×2 Linear Mode APD Detector for 3D Imaging

摘要:

设计了一种用于激光三维成像的128×2线性模式APD焦平面探测器,器件包括硅基APD焦平面阵列和读出电路。硅基APD焦平面阵列采用拉通型n⁺-p-π-p⁺结构,像元中心距为150μm,工作在线性倍增模式。读出电路采用单片集成技术,将前置放大电路、TDC计时电路和ADC等功能模块集成在单一硅片上。整个线性模式APD焦平面探测器可实现128×2阵列规模的激光信号并行检测,并采用LVDS串口输出激光脉冲信号的飞行时间信息和峰值强度信息。测试结果显示,该线性模式APD三维成像探测器可同时获取时间信息和强度信息,成像功能正常。

Abstract:

A kind of 128×2 linear mode APD focal plane detector used for 3D imaging is designed, including Si-based APD focal plane array (FPA) and read-out circuit. The APD FPA with the structure of punch through n⁺-p-π-p⁺ works at the linear multiply mode, and the pixel pitch is 150μm. The readout integrated circuit (ROIC) integrates the pre-amplifier, TDC, ADC and other function circuits on a single chip. The linear mode APD detector can simultaneously detect the laser pulse of 128×2 imaging array, then output the flight time and the amplitude of the laser pulse by using the LVDS driver. The test results show that the linear 3D imaging detector can obtain necessary information properly, verifying its effectiveness in imaging.