Liu Zhichao, Zhang Liang, Wei Heming, Xiao Zhelan, Qiu Zenghuan, Sun Ruoqi, Pang Fufei, Wang Tingyun
Opt Express. 2021 Apr 26;29(9):12880-12892. doi: 10.1364/OE.422255.
This paper demonstrates an underwater localization system based on an improved phase-sensitive optical time domain reflectometry (φ-OTDR). To localize the underwater acoustic source, 3D-printed materials with relatively high Poisson's ratio and low elastic modulus are wrapped by single-mode optical fibers to serve as an L-shaped planar sensing array, yielding a high-fidelity retrieval of acoustic wave signals. Based on the time difference of arrival (TDOA) algorithm, the time delay of signals detected by multiple sensing elements is used to locate the underwater acoustic source. Consequently, the three-dimensional localization feasibility of the proposed system is experimentally verified, showing a measurement error of about 2% in the localization range. It indicates that the proposed scheme is of great potential for applications in the underwater environment, such as trajectory tracking, oil/gas pipeline security monitoring and coastal defense.
本文展示了一种基于改进型相敏光时域反射仪（φ-OTDR）的水下定位系统。为了对水下声源进行定位，将具有相对较高泊松比和低弹性模量的3D打印材料用单模光纤包裹起来，用作L形平面传感阵列，从而实现对声波信号的高保真检索。基于到达时间差（TDOA）算法，利用多个传感元件检测到的信号的时间延迟来定位水下声源。因此，通过实验验证了所提系统的三维定位可行性，在定位范围内显示出约2%的测量误差。这表明所提方案在水下环境应用中具有巨大潜力，如轨迹跟踪、油气管道安全监测和海岸防御等。
