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Development of a novel Sagnac interferometer-based fiber-optic acoustic sensor array.

机译：基于Sagnac干涉仪的新型光纤声传感器阵列的开发。

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摘要

For over two decades, researchers have applied optical fiber technology to the field of oceanic acoustic sensing. Initially, most fiber-optic-based acoustic sensor array designs focused on the use of Mach-Zehnder-type interferometers as the acoustic sensors. The use of the Sagnac-interferometer for acoustic sensing has been demonstrated successfully in the context of single acoustic sensors, but not in the context of arrays which scale efficiently to high sensor counts.; In this dissertation, we present our efforts to develop large-scale fiber-optic-based acoustic sensor arrays based on the Sagnac-interferometer. We propose a novel design which enables a single Sagnac interferometer to support a large number of sensors, and we provide a detailed analysis of the performance of such an array. Many improvements to this basic design are proposed and demonstrated. The culmination of this design research is an array which has amongst its advantages a passively desensitized Sagnac loop (delay coil), a passive elimination of polarization-induced signal fading on all sensors, and an ability to create multiple outputs with arbitrary bias points. A full-scale demonstration of a 16-sensor Sagnac-based array with distributed erbium-doped fiber amplifiers in the array telemetry is described, providing experimental verification of the operation principle of the array as well as the optical noise theory. Additionally, an analysis of the dynamic range of interferometric sensor arrays (both Mach-Zehnder and Sagnac) is presented, and the dynamic range performance of the two types of arrays is compared for both military and ocean floor mapping applications. The results indicate that, for the military applications, the dynamic range performance of the Sagnac array is significantly better than that of the Mach-Zehnder array.
机译：在过去的二十多年中，研究人员已将光纤技术应用于海洋声学传感领域。最初，大多数基于光纤的声学传感器阵列设计都将重点放在使用Mach-Zehnder型干涉仪作为声学传感器上。 Sagnac干涉仪用于声音感应已在单个声音传感器的背景下得到了成功证明，但在有效扩展到高传感器数量的阵列的背景下却没有成功。在本文中，我们提出了基于Sagnac干涉仪开发基于光纤的大型声传感器阵列的努力。我们提出了一种新颖的设计，该设计使单个Sagnac干涉仪能够支持大量传感器，并且我们将对这种阵列的性能进行详细分析。提出并演示了对该基本设计的许多改进。本设计研究的最高潮是一个阵列，该阵列具有以下优点：被动降低灵敏度的Sagnac环路（延迟线圈），被动消除所有传感器上的极化感应信号衰减以及能够创建带有任意偏置点的多个输出。描述了阵列遥测中具有分布式掺-光纤放大器的基于16传感器基于Sagnac的阵列的全面演示，提供了阵列工作原理以及光学噪声理论的实验验证。此外，还对干涉式传感器阵列（Mach-Zehnder和Sagnac）的动态范围进行了分析，并比较了两种类型的阵列在军事和海底测绘应用中的动态范围性能。结果表明，在军事应用中，Sagnac阵列的动态范围性能明显优于Mach-Zehnder阵列。

著录项

  • 作者

    Vakoc, Benjamin James.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Physics Optics.; Engineering Electronics and Electrical.
  • 学位 Ph.D.
  • 年度 2001
  • 页码 145 p.
  • 总页数 145
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;无线电电子学、电信技术;
  • 关键词

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