研究目的
Investigating the photonic transmission in optical fiber tapers coated with polymethyl methacrylate (PMMA) for durable and simple humidity sensing.
研究成果
The study demonstrates a simple and durable humidity sensing approach using polymer-coated optical fiber tapers. The interference patterns in the transmission spectra, induced by stress birefringence, provide a viable method for humidity sensing with linear response to calibrated analytes and unique calibration plots for different volatiles.
研究不足
The study is limited by the thickness of the polymer film achievable with standard spin-coating procedures and the stabilization time of humidity in the chamber. The response time and sensitivity may vary with different analytes and environmental conditions.
1：Experimental Design and Method Selection:
The study involves the fabrication of optical fiber tapers coated with PMMA, a model for stress-induced birefringence, and the characterization of interference patterns in transmission spectra for humidity sensing.
2：Sample Selection and Data Sources:
Tapers were produced from standard single-mode low-loss fused silica fibers, coated with PMMA, and tested in controlled humid environments with different analytes.
3：List of Experimental Equipment and Materials:
Includes a custom-made tapering machine, hydrogen gas generator, stepper motors, IR camera, CCD camera, LabView application, spin coating system, film thickness probe tabletop reflectometer, IR tunable laser, IR detector, and humidity chamber.
4：Experimental Procedures and Operational Workflow:
The process involves tapering the fibers, coating them with PMMA, measuring the film thickness, and then testing the transmission spectra under varying humidity conditions.
5：Data Analysis Methods:
The analysis includes monitoring transmission spectra, calculating phase shifts, and defining principal components for analyte calibration.
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