Broadband light source for fiber-optic measurement system in spaceborne applications
Broadband light source for fiber-optic measurement system in spaceborne applications
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DOI：
10.1016/j.actaastro.2011.07.018
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发表时间：
2012-01-01
影响因子：
3.5
通讯作者：
Koch, Alexander W.
中科院分区：
文献类型：
--
作者：
Roessner, Max R.;Mueller, Mathias S.;Koch, Alexander W.
精确可靠地测量温度、机械载荷和导出量在航天飞行中起着重要作用。随着航天器变得越来越复杂，目前遥测技术的升级可能变得很麻烦。此外，由于智能结构、主动减振和复合材料健康监测等新兴技术的发展，对传感器提出了全新的要求。在先前的研究中已经证明，这些测量可以通过光纤系统有利地和有效地进行。光纤布拉格光栅是光纤应变和温度传感器中最重要的传感器。通常，多个光纤布拉格光栅用于将整个温度和应变场转换成光波长信息。为了询问这些传感器，需要宽带或扫描光源。关于光源的附加要求是光栅的高强度和非偏振照明。这些限制可以通过基于掺杂稀土的光纤中的放大的自发发射的光源来满足。在所提出的工作中，已经开发了一种紧凑的光源，适用于测量应用，并针对空间应用。介绍了该光源的设计和实现。光源的设计和测试的选定核心方面的空间鲁棒性和这些测试的结果进行了总结。(C)2011爱思唯尔有限公司保留所有权利。
Measuring temperatures, mechanical loads and derived quantities precisely and reliably play an important role in spaceflight. With spacecraft becoming increasingly complex, upscaling of present telemetry techniques can become cumbersome. Additionally, there are entirely new sensory requirements, resulting from emerging technologies such as smart structures, active vibration damping and composite material health monitoring. It has been demonstrated in preceding studies that these measurements can be advantageously and efficiently carried out by means of fiber-optic systems. The most prominent fiber-optic strain and temperature sensor is the fiber Bragg grating. Typically, multiple fiber Bragg gratings are used to translate entire temperature and strain fields into an optical wavelength information. For the interrogation of these sensors, a broadband or scanning light source is required. Additional requirements with respect to the light source are high intensity and unpolarized illumination of the gratings. These constraints can be met by a light source that is based on amplified spontaneous emission in a rare-earth-doped fiber. In the presented work, a compact light source, adapted for measurement applications and targeted towards space applications, has been developed. The design of this light source is presented, as well as its implementation. The light source has been designed and tested for selected core aspects of space robustness and the results of these tests are summarized. (C) 2011 Elsevier Ltd. All rights reserved.