研究目的
Developing a highly sensitive, linear output, low cross-sensitivity and probe-type yet reliable sensor for the detection of relative humidity (RH).
研究成果
The proposed U-shaped MFC humidity sensor exhibits high sensitivity, good linearity, and low temperature cross-sensitivity, making it suitable for middle and low level relative humidity measurement.
研究不足
The hysteresis error caused by water molecules absorbed by sensors not being completely released into the surrounding environment. The effect of temperature fluctuation on the detection results.
1：Experimental Design and Method Selection:
The sensor was developed by combining a U-shaped microfiber coupler (MFC) with a polyvinyl alcohol (PVA) coating. The MFC was fabricated using a flame-heated taper drawing technique.
2：Sample Selection and Data Sources:
Two single-mode fibers were used to fabricate the MFC. The PVA solution was prepared by dispersing PVA granules into ultrapure water.
3：List of Experimental Equipment and Materials:
A Bunsen burner flame, translation stages, PVA granules, ultrapure water, a magnetic stirrer, and a dip coater were used.
4：Experimental Procedures and Operational Workflow:
The MFC was fabricated by stretching two single-mode fibers together. The waist region of the MFC was functionalized with a PVA overlay. The sensor was then fixed as a U-shape.
5：Data Analysis Methods:
The response of the transmission spectrum for different RH levels was measured using an optical spectrum analyzer.
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