Application of synthesized coherence function to distributed optical sensing
Application of synthesized coherence function to distributed optical sensing
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DOI：
10.1088/0957-0233/13/11/311
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发表时间：
2002-11-01
影响因子：
2.4
通讯作者：
Hotate, K
中科院分区：
文献类型：
--
作者：
Hotate, K
我们提出并发展了一种将光学相干函数合成成任意形状的技术。利用这种被我们称为“光学相干函数合成”的技术，已经发展出各种分布式光学传感方案，它不需要机械运动部件，也不需要数据计算。在这些方案中，我们不使用脉冲光波，而是使用连续波，其相关性由频率调制或相位调制控制。我们提出了一种用于诊断光纤用户网络的反射率测量系统。还开发了适用于智能结构和安全系统的光纤分布式力传感系统。以类似的方式，我们提出了一种系统，通过光纤中产生的布里渊散射来测量光纤上的应变分布。该系统的空间分辨率仅为1厘米，比常规脉冲光波技术的实际极限提高了100倍。如此高的空间分辨率适合于智能材料的应用。通过这种技术也发展了二维或三维分布式传感。提出了一种机械运动部件少的光学层析成像系统。还研制了多层物体表面形状测量系统。
We have proposed and developed a technique to synthesize an optical coherence function into arbitrary shapes. By using this technique, which we call the 'synthesis of an optical coherence function', various distributed optical sensing schemes have been developed, which have no mechanical moving parts nor data calculation. In these schemes, we do not use a pulsed lightwave but instead use a continuous wave, whose correlation is controlled by frequency modulation or phase modulation. We have proposed a reflectometry system to diagnose fibre optic subscriber networks. Fibre optic distributed force sensing systems have also been developed, which are applicable to smart structures and security systems. In a similar way, we have proposed a system to measure strain distribution along an optical fibre through the Brillouin scattering caused in the fibre. Spatial resolution of just I cm has been demonstrated by this system, which is 100 times higher than the practical limitation of conventional pulsed-lightwave techniques. Such a high spatial resolution is suitable for smart material applications. Two- or three-dimensional distributed sensing has also been developed by this technique. An optical tomography system has been proposed, which has fewer mechanical moving parts. A system for surface shape measurement for a multi-layered object has also been developed.