Oh Min Seok, Kong Hong Jin, Kim Tae Hoon, Hong Keun Ho, Kim Byung Wook, Park Dong Jo
Department of Physics, KAIST, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Rev Sci Instrum. 2010 Mar;81(3):033109. doi: 10.1063/1.3374109.
In this paper, a direct-detection laser radar system that uses a Geiger-mode avalanche photodiode (GAPD) of relatively short dead time (45 ns) is described. A passively Q-switched microchip laser is used as a laser source and a compact peripheral component interconnect system, which includes a time-to-digital converter (TDC), is set up for fast signal processing. With both the GAPD and the TDC functioning multistop acquisition, the system operates in a multihit mode. The software for the three-dimensional visualization and an algorithm for the removal of noise are developed. It is shown that the single-shot precision of the system is approximately 10 cm (sigma) and the precision is improved by increasing the number of laser pulses to be averaged so that the precision of approximately 1 cm (sigma) was acquired with more than 150 laser pulses scattered from the target. The accuracy of the system is measured to be 12 cm when the energy of the emitted laser pulse varies with a factor of 7.
本文描述了一种直接探测激光雷达系统，该系统使用死区时间相对较短（45纳秒）的盖革模式雪崩光电二极管（GAPD）。采用被动调Q微芯片激光器作为激光源，并搭建了一个紧凑的外围组件互连系统，其中包括一个时间数字转换器（TDC），用于快速信号处理。通过GAPD和TDC都进行多触发采集，系统以多击中模式运行。开发了用于三维可视化的软件和去除噪声的算法。结果表明，该系统的单次精度约为10厘米（均方根误差），通过增加平均激光脉冲数可提高精度，以至于从目标散射的150多个激光脉冲可获得约1厘米（均方根误差）的精度。当发射激光脉冲的能量变化7倍时，测得该系统的准确度为12厘米。
