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首页> 外文会议>Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007; Proceedings of SPIE-The International Society for Optical Engineering; vol.6530 >Interface transferring mechanism and error modification of OFBG strain sensor based on mono-scalar isotropic damage constitutive model
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Interface transferring mechanism and error modification of OFBG strain sensor based on mono-scalar isotropic damage constitutive model

机译：基于单标量各向同性损伤本构模型的OFBG应变传感器的接口传递机理及误差修正

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摘要

This paper presents the interface transferring mechanism and error modification of the Optical Fiber Bragg Grating (OFBG) sensors based on the mono-scalar isotropic damage constitutive model. The OFBG sensor is made up of optical fiber and encapsulated materials which include protective coating, adhesive layer et al. The accuracy of OFBG sensor is highly dependent on the physical and mechanical properties of the optical fiber and encapsulated materials. The encapsulated materials were regarded as scatheless continuum in the prevenient researches and the elastic modulus, for example, the Young's modulus (E) or shear modulus (G), was keeping constant from the beginning to the end of transformations. However, there is lots of damage, such as microcracks, inclusions and voids, in the encapsulated materials. And these micro-defects can become cores, expand and joint up with together which induce the gradual bad in the materials. Hence, the modulus (E and G) is no longer assumed as a constant but as a variable with the damage. So the mono-scalar isotropic damage model (damage modulus D) is employed to describe the shear constitutive equation of the encapsulated materials along the optical fiber axes. The general expression of multilayer interface strain transferring mechanism of OFBG sensor is given based on the isotropic damage theory. And the error rate and error modification coefficient of OFBG sensor are obtained under the defining of average strains. The results indicate that the damage of encapsulated materials affects the interface strain transferring property of the OFBG sensor.
机译：本文介绍了基于单标量各向同性损伤本构模型的光纤布拉格光栅（OFBG）传感器的接口传输机制和误差修正。 OFBG传感器由光纤和封装材料组成，包括保护涂层，粘合层等。 OFBG传感器的精度高度依赖于光纤和封装材料的物理和机械性能。在以前的研究中，封装材料被视为无连续的连续体，并且弹性模量，例如杨氏模量（E）或剪切模量（G），从转换开始到结束都保持恒定。但是，封装材料中存在许多损坏，例如微裂纹，夹杂物和空隙。这些微小的缺陷会变成核心，扩展并结合在一起，从而导致材料逐渐变质。因此，模量（E和G）不再假定为常数，而是损坏的变量。因此，采用单标量各向同性损伤模型（损伤模量D）来描述封装材料沿光纤轴的剪切本构方程。基于各向同性损伤理论，给出了OFBG传感器多层界面应变传递机理的一般表达式。在平均应变的定义下，获得了OFBG传感器的误差率和误差修正系数。结果表明，封装材料的损伤影响了OFBG传感器的界面应变传递特性。

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