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Multifunctional Fiber Optic Temperature/Strain/Ae Sensor and Its Applications for Composite Materials

Author: FuTao
Tutor: LengJinSong
School: Harbin Institute of Technology
Course: Engineering Mechanics
Keywords: Fiber Optic Sensors Fiber Bragg Grating Composites Acoustic emission Multifunction
CLC: TB33
Type: Master's thesis
Year: 2008
Downloads: 106
Quote: 0
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Abstract


Advanced composite structures due to high specific strength and specific stiffness and good fatigue resistance and forming process of, is widely used in aviation , aerospace , construction, transportation and other aspects . But at the same fiber-reinforced composite materials in the performance of the physical and mechanical properties are anisotropic , and in the course of a variety may be affected by external environmental impacts, including temperature and load , etc. , leaving the composite materials and structures produce injuries, these injuries will composite materials and structures safe use and life cause great threat and impact . Therefore, the study and the realization of composite materials and structures line monitoring has important practical significance. In this thesis, to design a new multi-functional optical fiber sensors. The sensor is based on fiber Bragg grating and fiber optic pigtails , composite materials and structures used in temperature, strain and real-time monitoring of acoustic emission . While for fiber Bragg grating temperature and strain sensitive to different wavelengths of paper, double grating solve the problem, this method has high accuracy, and low cost, simple process ; elastic wave right as against the basic elements of optical communication fiber coupler itself no vibration effects , we use fused tapered cone method was developed as a single-mode fiber coupler fiber optic acoustic emission sensors , acoustic emission analysis of the optical fiber sensor works , and apply it to the composite laminates three point bending test , carried out real-time online damage monitoring ; combine theory and optical fiber Bragg grating coupler principle, design , development of all-fiber multi- sensor , will be applied to composite laminates tensile test, the real-time online monitoring . The results confirm that the design of this sensor can effectively monitor composite laminates injury for the safe use of composite materials to provide a theoretical basis and practical experience.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials
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