Interface transferring mechanism and error modification of OFBG strain sensor based on mono-scalar isotropic damage constitutive model

Jilong Li; Zhi Zhou; Jinping Ou

doi:10.1117/12.716121

10 April 2007 Interface transferring mechanism and error modification of OFBG strain sensor based on mono-scalar isotropic damage constitutive model

Jilong Li, Zhi Zhou, Jinping Ou

Author Affiliations +

Proceedings Volume 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007; 65300Y (2007) https://doi.org/10.1117/12.716121
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2007, San Diego, California, United States

Abstract

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.

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Jilong Li, Zhi Zhou, and Jinping Ou "Interface transferring mechanism and error modification of OFBG strain sensor based on mono-scalar isotropic damage constitutive model", Proc. SPIE 6530, Sensor Systems and Networks: Phenomena, Technology, and Applications for NDE and Health Monitoring 2007, 65300Y (10 April 2007); https://doi.org/10.1117/12.716121

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KEYWORDS

Sensors

Optical fibers

Interfaces

Adhesives

Coating

Fiber Bragg gratings

Error analysis

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