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Carbon fiber reinforced composites embedded fiber Bragg grating sensing research

Author: TianGaoJie
Tutor: LiChuan
School: Kunming University of Science and Technology
Course: Signal and Information Processing
Keywords: Fiber Bragg Grating Strain Wavelength shift Cantilever Carbon fiber reinforced composites
CLC: TN253
Type: Master's thesis
Year: 2010
Downloads: 84
Quote: 0
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Abstract


Smart optical sensing element structure is the driving element and a microprocessor control system integration with the base material, to form a identification, analysis, judgment, action and other functions of a structure. This structure is not only able to withstand the loads, which can perceive changes in internal and external environment, and by changing the shape of their physical performance or respond to realize self-diagnosis, adaptive, self-healing capabilities. Therefore, smart structures in the military field, civil engineering and other fields has broad prospects. This selection of fiber Bragg grating as a carbon fiber reinforced composites (Carbon Fiberglass Reinforced Plastics, abbreviation: CFRP) sensing materials, through the fiber Bragg grating embedded carbon fiber reinforced composite material, forming a set of structural reinforcement and monitoring in one Flexible Packaging monitoring structures, and through the experimental study of the structure of the sensing performance, the main contents are as follows: 1. designed a carbon fiber-reinforced composite material embedded fiber Bragg grating structures. The unidirectional carbon fiber sheath is placed at one end of the catheter exterior carbon fiber aside, then fiber Bragg grating from the central conduit penetration, the grating is carbon fiber wrapped outside the port, a carbon fiber sheath extending to the import and export part of the optical fiber is protected. (2) carbon fiber reinforced composites based on the strain and the stress of a linear relationship between the fiber Bragg grating embedded carbon fiber reinforced composite materials, the establishment of a fiber grating strain sensor model Bragg wavelength stress variation with offset value corresponding to the relations, and thus on the structure of the sensing grating smart performance of theoretical calculations. Depending on the specific structural components of the material and size, to calculate the fiber Bragg grating strain sensitivity of 81.4pm/Kg; theoretical resolution is: 0.012pm/Kg. 3 would be implanted carbon fiber Bragg grating fiber-reinforced composite materials pasted on the surface of equal strength cantilever, peering through repeated loading and unloading strength cantilever beam attached to its surface so as to drive the carbon fiber reinforced composite materials packaged with fiber Bragg grating strain response of the Bragg wavelength shift. Experimental results show that the sensitivity of loading: 82.8pm/Kg; unloading sensitivity: 79.2pm/Kg, the actual resolution is: 0.013pm/Kg. 4 In order to determine the temperature during the measurement of the strain of the whole structure, using an independent temperature measurement means to determine the grating attached to the cantilever surface temperature sensitivity of smart structures. Through the whole experiment repeatedly heated cantilever, so that the surface of the grating attached to sense its temperature becomes smart structures. Experiments using the Bragg grating center wavelength is 1564.5 nm, the theoretical temperature sensitivity of 10.9 pm / ℃, experimentally measured temperature sensitivity obtaining 24.7pm / ℃.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
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