研究目的
Investigating the performance of a highly-sensitive and fast-responsive optical fiber temperature sensor based on sealed liquid ethanol with a large detection range.
研究成果
The proposed optical fiber temperature sensor based on sealed liquid ethanol exhibits high sensitivity, good linearity, large detection range, fast response, and good repeatability, making it suitable for widespread application.
研究不足
The volume ratio of ethanol to air cannot be too large, as it limits the expansion of ethanol and affects temperature sensitivity. The sensor's performance is also influenced by the temperature fluctuation of the tube furnace.
1：Experimental Design and Method Selection:
The sensor was designed based on the sealed liquid ethanol in a fiber Fabry-Perot (FP) micro-cavity. The ethanol was injected into the cavity through a thin core silica capillary tube (SCT), which was then spliced to a single mode fiber. A section of air core was formed in the thin core SCT near the splicing position.
2：Sample Selection and Data Sources:
The sensor's performance was tested by placing it in a tube furnace heated from 20 °C to 220 °C, with the reflection spectrum monitored in real time.
3：List of Experimental Equipment and Materials:
Optical spectrum analyzer (OSA) (YOKOGAWA, AQ6370B), broadband light source (BBS) (1200 nm to 1700 nm), circulator, tube furnace, thermometer.
4：Experimental Procedures and Operational Workflow:
The sensor was placed in the tube furnace, and its reflection spectrum was recorded at each temperature after stabilization. The temperature was increased and decreased to test repeatability and stability.
5：Data Analysis Methods:
The wavelength shift and mean loss variation of the interference fringe were analyzed to determine temperature sensitivity and response time.
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