研究目的
Investigating the performance of an optical fiber Fabry-Perot interferometer based on sapphire wafer for high-temperature sensing under Co-60 γ irradiation.
研究成果
The proposed optical fiber F-P interferometric sensor based on sapphire wafer demonstrates excellent performance for high-temperature sensing under Co-60 γ irradiation, with a sensitivity of 29.9 pm/oC at 800°C. It shows great potential for applications in environments with strong irradiation and high temperature.
研究不足
The fiber coating burns off at 800°C, limiting the sensor's use in static environments. High-temperature resistant coating materials or new packaging methods are needed for long-term use in harsh conditions.
1：Experimental Design and Method Selection:
The sensor is designed with a sapphire wafer as the F-P resonant cavity and a pure silica multi-mode fiber as the input fiber. The sensor is exposed to Co-60 γ irradiation with varying irradiation times and absorbed dose rates.
2：Sample Selection and Data Sources:
Three types of silica optical fibers are used, with the 50/125 μm pure silica multi-mode fiber selected for its lower attenuation.
3：List of Experimental Equipment and Materials:
Includes a Co-60 Gamma rays source, a super-continuous laser source, a multimode 3-dB coupler, and an optical spectrometer.
4：Experimental Procedures and Operational Workflow:
The sensor is irradiated and then subjected to high-temperature tests up to 800°C, with reflection spectra recorded at each temperature point.
5：Data Analysis Methods:
The change in optical path difference (OPD) is related to temperature changes, and the reflection spectra are analyzed to determine temperature sensitivity.
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