Kong Hong Jin, Kim Tae Hoon, Jo Sung Eun, Oh Min Seok
Department of physics, KAIST, 373-1 Guseong-dong, Yuseong-gu, Daejeon 305-701, Korea.
Opt Express. 2011 Sep 26;19(20):19323-9. doi: 10.1364/OE.19.019323.
In this paper, we propose a new method that is capable of obtaining a clear 3D image by the reduction of false alarms caused by noise in the stage of acquisition of raw time of flight (TOF) data. This method is implemented by intensity dividing a laser-return pulse into two Geiger-mode avalanche photodiodes (GmAPDs); an AND gate compares the arrival time of the electrical signals from the GmAPDs. Despite the fact that the energy of a laser-return pulse is decreased by half, the false alarm probability is drastically decreased because the noise distributed randomly in the time domain is filtered out. The experimental measurement is in agreement with the theoretical analysis. As a result, we can obtain a clear 3D image despite the high noise.
在本文中，我们提出了一种新方法，该方法能够在原始飞行时间（TOF）数据采集阶段减少由噪声引起的误报，从而获得清晰的三维图像。该方法通过将激光回波脉冲的强度分为两个盖革模式雪崩光电二极管（GmAPD）来实现；一个与门将来自GmAPD的电信号的到达时间进行比较。尽管激光回波脉冲的能量减半，但由于在时域中随机分布的噪声被滤除，误报概率大幅降低。实验测量结果与理论分析一致。因此，尽管噪声很高，我们仍可以获得清晰的三维图像。
