研究目的
To develop a novel hybrid damage detection system utilizing piezoelectric actuators for guided wave excitation and a new fiber optic sensor based on Fabry-Perot and Fiber Bragg Grating for higher strain resolution and reliability in structural health monitoring.
研究成果
The novel FBG-based FP sensor demonstrated higher sensitivity to strain waves and improved performance in detecting guided waves compared to traditional FBG sensors. The system showed high reliability under varying operational conditions, making it suitable for structural health monitoring applications. Future work includes testing the system for barely visible impact damage and exploring its multiplexing capability.
研究不足
The manufacturing tolerances of wavelengths for the FBG-based FP sensors posed a challenge, requiring a large number of FBGs to be manufactured to find two with the closest wavelength. The splice process also introduced a limitation on the minimum cavity length.
1：Experimental Design and Method Selection:
The study involved designing a novel FBG-based FP sensor, simulating its spectrum, and validating it experimentally. The hybrid system combined PZT actuators with FO sensors for guided wave excitation and detection.
2：Sample Selection and Data Sources:
A carbon fiber reinforced polymer (CFRP) specimen was used as the host structure. The locations of the FBG sensor, the FBG-based FP sensor, the PZT actuator, and the artificial damage were specified.
3：List of Experimental Equipment and Materials:
Equipment included a tunable laser, circulator, FO sensors, photo detector, and oscilloscope for spectrum acquisition. Materials included prepregs (hexcel 914C-TS-5) for the CFRP specimen.
4：Experimental Procedures and Operational Workflow:
The process involved acquiring the reflectivity spectrum, choosing a focus wavelength, and measuring the change in optical intensity at that wavelength to record Lamb wave signals.
5：Data Analysis Methods:
The sensitivity of the FBG-based FP sensor to micro-strain was measured, and its performance was compared to conventional FBG sensors using damage indices.
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