Complete Phase-Strain Model for Structurally Embedded Interferometric Optical Fiber Sensors
Complete Phase-Strain Model for Structurally Embedded Interferometric Optical Fiber Sensors
复制标题
结构嵌入式干涉式光纤传感器的完整相应变模型
DOI：
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发表时间：
1990
期刊：
影响因子：
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通讯作者：
H. Haslach
中科院分区：
文献类型：
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作者：
J. Sirkis;H. Haslach
将经典的三维晶体光学和经典的波导理论结合起来，形式化地给出了单模光纤中三维应变状态与光学相位延迟之间的关系。诺依曼的应变光学关系描述的形式可用于光纤传感器的设计。这些关系，然后结合弱引导光纤理论，开发一个积分，涉及在结构嵌入式干涉型光纤应变传感器的光学相移的诱导三维应变场。这一过程导致了一个先前未公开的附加波导色散项，它与Butter和Hocker（1978）导出的项对总应变引起的相位延迟的贡献在同一数量级上。然而，波导色散效应仍然可以忽略不计，即使在三维加载. Butter和Hocker方程和本文开发的完整相位应变模型在应用于某些嵌入式传感器时可以给出非常相似的结果。这种异常可能导致错误的结论，黄油和霍克的结果是同样有效的任何结构嵌入式传感器。
The relation between a three-dimensional state of strain and the optical phase retardation in a single mode optical fiber is formalized by drawing together classical three-dimensional crystal optics and classical waveguide theory. Neumann's strain optic relations are described in a form usable in optical fiber sensor design. These relations are then combined with weakly guiding fiber theory to develop an integral which relates the optical phase shift in a structurally embedded interferometric optical fiber strain sensor to the induced three-dimensional strain field. This process leads to a previously undisclosed, additional waveguide dispersion term which contributes on the same order to the total strain induced phase retardation as does the term derived by Butter and Hocker (1978). Still, however, waveguide dispersion effects are found to be negligibly small, even in three- dimensional loading. Butter and Hocker's equation and the complete phase-strain model developed herein can give very similar results when both are applied to certain embedded sensors. This anomaly can lead to the false conclusion that Butter and Hocker's results are equally valid for any structurally embedded sensor.