Resolving range ambiguity in a photon counting depth imager operating at kilometer distances
Resolving range ambiguity in a photon counting depth imager operating at kilometer distances
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DOI：
10.1364/oe.18.009192
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发表时间：
2010-04-26
期刊：
影响因子：
3.8
通讯作者：
Buller, Gerald S.
中科院分区：
文献类型：
--
作者：
Krichel, Nils J.;McCarthy, Aongus;Buller, Gerald S.
时间相关单光子计数技术最近已用于基于飞行时间测量的测距和深度成像系统中。这些系统发射低平均功率的脉冲激光信号并测量散射返回的光子。使用周期性激光脉冲意味着只有在低重复频率下（对于1千米的距离通常为100千赫兹）才能明确地测量绝对距离，以确保在任何时刻只有一个脉冲在传输。我们展示了一种伪随机模式匹配技术在使用吉赫兹基时钟频率的扫描测距仪系统中的应用，允许以相当于>10兆赫兹的平均脉冲频率获取明确的三维图像。给出了在50米到4.4千米范围内具有厘米级距离不确定度的深度图像。（C）2010美国光学学会
Time-correlated single-photon counting techniques have recently been used in ranging and depth imaging systems that are based on time-of-flight measurements. These systems transmit low average power pulsed laser signals and measure the scattered return photons. The use of periodic laser pulses means that absolute ranges can only be measured unambiguously at low repetition rates (typically 100 kHz for 1 km) to ensure that only one pulse is in transit at any instant. We demonstrate the application of a pseudo-random pattern matching technique to a scanning rangefinder system using GHz base clock rates, permitting the acquisition of unambiguous, three-dimensional images at average pulse rates equivalent to >10 MHz. Depth images with centimeter distance uncertainty at ranges between 50 m and 4.4 km are presented. (C) 2010 Optical Society of America