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The Sensor Characteristics and Test Technology of Fiber Bragg Grating

Author: TanMinFeng
Tutor: ZhuSiRong
School: Wuhan University of Technology
Course: Solid Mechanics
Keywords: Fiber Bragg grating Transverse effect Strain measurement Mounting orientation Demarcate
CLC: TN253
Type: Master's thesis
Year: 2006
Downloads: 261
Quote: 6
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Abstract


The research topics of this paper comes from the National Natural Science Foundation-funded project: smart concrete structure (item number: 50238040). The fiber optic sensor signal detection and transmission functions, in intelligent highway cement structure, smart buildings, bridges and aircraft skin and other aspects have a wide range of applications. The fiber-optic sensors can be used to detect strain, temperature, displacement, the concentration of chemical substances, acceleration, pressure, current, magnetic field, and of some other signal, is by far the most mature fiber sensor. To measure the strain in the optical fiber sensor, the multi-axial strain response of the optical fibers, ignoring the lateral effect. Start from the fiber transverse effect, strain measurement, packaging and calibration of fiber optic sensors to carry out from experimental and theoretical research. 1, experimental verification of the presence of the transverse effect of the optical fiber. Design a set of processing the experimental apparatus to produce unidirectional strain field, the effects of fiber grating Bragg wavelength occurs only by the transverse strain changes, and contrast axial fiber Bragg grating strain response, the results show that the fiber Bragg grating transverse strain the presence of a response. 2, the theoretical error error correction formula derived fiber transverse effect brought. Mechanics of Materials and FBG strain response formula to deduce the the fiber transverse effect of the error correction formula, through experiment and explore the orientation and installation of fiber optic sensor installation error of strain measurement results. Discuss how fiber Bragg grating strain spent to determine the direction and size of the main points in the plane strain state strain, and export all kinds of grating strain rosette strain correction formula. 3, the production of the fiber optic sensors of an aluminum foil package, and through the experimental study of the strain and the temperature response characteristics. Produced by the optical fiber sensor of aluminum and a resin package, under the experimental conditions it a tensile strain response characteristics, temperature test them in a water bath, and its temperature response characteristics. Produced a steel pipe encapsulated fiber sensitization temperature and temperature sensors, and the and made temperature calibration, the results show that the sensor is able to preferably exclude the interference of stress and strain. 4, combined with the strain of a two-dimensional optical fiber sensor calibration, optical fiber sensor strain calibration should pay attention to the problem. Strain calibration of the two-dimensional optical fiber sensor takes a different approach, the results obtained are different, you want to get a more accurate calibration results, calibration test environment must be the same as or similar to the actual measurement environment. Simultaneously with a high-precision material testing machine on bare grating to be stretched, the bare Grating Strain - a wavelength response curve.

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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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