Oh Min Seok, Kong Hong Jin, Kim Tae Hoon, Jo Sung Eun, Kim Byung Wook, Park Dong Jo
Department of Physics, Korea Advanced Institute of Science and Technology, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea.
J Opt Soc Am A Opt Image Sci Vis. 2011 May 1;28(5):759-65. doi: 10.1364/JOSAA.28.000759.
In this paper, a photon-counting three-dimensional imaging laser detection and ranging (LADAR) 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. The combination of a GAPD with short dead time and a TDC with a multistop function enables the system to operate in a single-hit or a multihit mode during the acquisition of time-of-flight data. The software for the three-dimensional visualization and an algorithm for the removal of noise are developed. For the photon-counting LADAR system, we establish a theoretical model of target-detection and false-alarm probabilities in both the single-hit and multihit modes with a Poisson statistic; this model provides the prediction of the performance of the system and a technique for the acquisition of a noise image with a GAPD. Both the noise image and the three-dimensional image of a scene acquired by the photon-counting LADAR system during the day are presented.
本文描述了一种光子计数三维成像激光探测与测距（LADAR）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。死区时间短的GAPD与具有多停止功能的TDC相结合，使系统能够在采集飞行时间数据期间以单光子计数或多光子计数模式运行。开发了用于三维可视化的软件和去除噪声的算法。对于光子计数LADAR系统，我们建立了基于泊松统计的单光子计数和多光子计数模式下目标检测和虚警概率的理论模型；该模型提供了系统性能预测以及利用GAPD获取噪声图像的技术。文中给出了白天由光子计数LADAR系统采集的场景噪声图像和三维图像。
