研究目的
To propose and demonstrate a high-accuracy Young’s modulus measurement scheme for metal wires using FBG sensors based on the static stretching method.
研究成果
The FBG-based method accurately measures Young's modulus of various metal wires with errors less than 1.0%, demonstrating high precision, stability, and repeatability. It is feasible for material selection in fields like civil engineering and machine design, especially for small wires.
研究不足
The method requires an expensive optical spectrum analyzer for demodulation, though it can be replaced with lower-cost systems. It is specifically designed for small-diameter wires where strain gauges are not suitable.
1：Experimental Design and Method Selection:
The experiment uses a static stretching method where metal wires are loaded with strain, and a universal formula relating Bragg wavelength shift to Young's modulus is derived. The FBG sensor is employed due to its high sensitivity and immunity to electromagnetic interference.
2：Sample Selection and Data Sources:
Metal wires (copper, aluminum, nickel, tungsten) with diameters around 0.1 mm are used. The nominal Young's modulus values are taken from data sheets for comparison.
3：1 mm are used. The nominal Young's modulus values are taken from data sheets for comparison. List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Equipment includes an amplified spontaneous emission (ASE) light source, optical circulator, optical spectrum analyzer (OSA), FBG, heat-melt tubes (HMTs), fusion splicer, scales for loading, and a CCD imaging system for comparison. Materials are the metal wires.
4：Experimental Procedures and Operational Workflow:
The FBG is fixed to the wire using HMTs and a fusion splicer. One end of the wire is fixed, and the other end hangs a tray for adding scales to apply axial force. The Bragg wavelength shift is measured with the OSA as force is varied. Measurements are taken in both elongation and restoration directions, and averaged.
5：Data Analysis Methods:
Linear regression is used to relate Bragg wavelength shift to axial force. Young's modulus is calculated using the derived formula. Results are compared with nominal values and CCD method measurements, with errors calculated.
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Optical Spectrum Analyzer
AQ6370C
YOKOGAWA
Records the reflected spectrum of the FBG to measure Bragg wavelength shifts.
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Fusion Splicer
FSM-60S
Fujikura
Used to fix the ends of the FBG to the wire using heat-melt tubes.
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Charge Coupled Device Imaging System
ZW-YM-1
Used as a traditional method for comparing Young's modulus measurements.
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Amplified Spontaneous Emission Light Source
Provides broadband light (1525 nm–1565 nm) launched into the FBG.
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Optical Circulator
Directs light from the ASE source into the FBG and reflected light to the OSA.
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Fiber Bragg Grating
Senses strain by shifting Bragg wavelength; attached to metal wires.
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Heat-Melt Tubes
HMTs
Used to fix the FBG ends to the wire via fusion splicing.
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