Passive optical time-of-flight for non line-of-sight localization
Passive optical time-of-flight for non line-of-sight localization
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DOI：
10.1038/s41467-019-11279-6
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发表时间：
2019-07-26
影响因子：
16.6
通讯作者：
Katz, Ori
中科院分区：
文献类型：
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作者：
Boger-Lombard, Jeremy;Katz, Ori
穿过漫射、视觉不透明障碍物和拐角处的光学成像是从国防到医疗应用等许多领域的一个重要挑战。最近，将飞行时间（TOF）测量与计算重建相结合的新技术已经实现了对隐藏在视野中的物体的突破性成像和跟踪。这些基于光检测和测距（LiDAR）的方法需要主动短脉冲照明和超快时间分辨检测。在这里，我们引入了无源无线电探测和测距 (RADAR) 和无源地球物理测绘方法的概念，提出了一种光学 TOF 技术，该技术允许通过漫射屏障和拐角处对光源和反射物体进行无源定位。我们的方法通过干涉测量法从散射光的时间互相关中检索 TOF 信息，提供的时间分辨率超过最先进的超快探测器三个数量级。虽然我们的被动方法受到相对稀疏场景的信噪比的限制，但我们使用简单的设置演示了多个白光源和隐藏在视图中的反射物体的被动定位。
Optical imaging through diffusive, visually-opaque barriers and around corners is an important challenge in many fields, ranging from defense to medical applications. Recently, novel techniques that combine time-of-flight (TOF) measurements with computational reconstruction have allowed breakthrough imaging and tracking of objects hidden from view. These light detection and ranging (LiDAR)-based approaches require active short-pulsed illumination and ultrafast time-resolved detection. Here, bringing notions from passive radio detection and ranging (RADAR) and passive geophysical mapping approaches, we present an optical TOF technique that allows passive localization of light sources and reflective objects through diffusive barriers and around corners. Our approach retrieves TOF information from temporal cross-correlations of scattered light, via interferometry, providing temporal resolution that surpasses state-of-the-art ultrafast detectors by three orders of magnitude. While our passive approach is limited by signal-to-noise to relatively sparse scenes, we demonstrate passive localization of multiple white-light sources and reflective objects hidden from view using a simple setup.