研究目的
Investigating the fabrication and characterization of a magnetized metal-encapsulated FBG sensor for structural health monitoring.
研究成果
The study demonstrated a novel method for fabricating a metal-packaged magnetic, reusable FBG sensor using stainless steel and tin with SmCo magnets. The sensor showed feasible load, temperature, and vibration sensitivity for structural health monitoring applications, with the advantage of being easily detachable and reusable without adhesives.
研究不足
The FBG starts to deteriorate at high temperatures close to 400 °C, with rapid degradation beyond this point. The maximum operating temperature of the polyimide-coated FBG sensors used is 300 °C. The packaged sensor was characterized only up to 200 °C due to the melting point of tin being 232 °C.
1：Experimental Design and Method Selection:
The design involves metal packaging of an FBG sensor using stainless steel and tin, incorporating SmCo magnets for magnetic capabilities. The sensor's load, temperature, and vibration sensitivity are studied numerically and validated experimentally.
2：Sample Selection and Data Sources:
FBGs obtained from DK photonics, 10 mm long with polyimide buffer coating, peak reflected wavelengths of circa 1540 and 1550 nm.
3：List of Experimental Equipment and Materials:
Stainless steel, tin, SmCo magnets, teflon tube, FBG interrogator (I-MON 256, Ibsen Photonics), button load cell SLB-100, load cell conditioner unit SCC-SG24, data acquisition board (NI6321e), carbolite laboratory chamber furnace, infrared temperature sensor, tuning forks.
4：Experimental Procedures and Operational Workflow:
Fabrication of the sensor involves machining a stainless steel container and tin disc, inserting the FBG sheathed in a teflon tube, positioning SmCo magnets, heating the assembly to melt the tin, and cooling. Characterization involves applying load, temperature changes, and vibrations to measure the sensor's response.
5：Data Analysis Methods:
The reflection spectra of the FBG were monitored before and after packaging. Load, temperature, and vibration-induced wavelength shifts were measured and analyzed using FFT for vibration measurements.
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