研究目的
To develop a reliable and sensitive method for monitoring hydrous ethanol concentration using a graphene oxide-coated fiber optic sensor based on Fresnel reflection, addressing limitations of existing methods such as cost, complexity, and limited measurement range.
研究成果
The GO-coated fiber optic sensor demonstrated improved sensitivity (0.08 dB/%) and a wide measurement range (0-100%) for hydrous ethanol detection, with fast response times (<2 seconds). It offers advantages in size, simplicity, and real-time monitoring capabilities, making it suitable for various applications. Future work could focus on optimizing the coating for even better performance.
研究不足
The sensor's response time may be affected by residual ethanol on the surface when not wiped, potentially leading to irregular variations. The coating thickness and material could be further optimized for higher sensitivity. Field applications might be limited by environmental factors not tested.
1：Experimental Design and Method Selection:
The study uses a Fresnel reflection-based sensor with a graphene oxide (GO) coating on the optical fiber tip to enhance sensitivity and measurement range for ethanol concentration. The sensing principle relies on changes in refractive index due to ethanol adsorption on GO.
2：Sample Selection and Data Sources:
Hydrous ethanol solutions with concentrations ranging from 0% to 100% were prepared and used for testing.
3：List of Experimental Equipment and Materials:
Optical fibers, graphene oxide (prepared by Hummers method), chemicals (sulfuric acid, phosphoric acid, KMnO4, H2O2, HCl, NaOH, ethanol), light source (ASE broadband source), photodetectors, directional coupler, data acquisition system, SEM for imaging, Raman spectrometer, X-ray diffractometer.
4：Experimental Procedures and Operational Workflow:
GO was synthesized and characterized. Optical fiber tips were functionalized with NaOH treatment and dip-coated with GO. The sensor system was set up with a light source, coupler, sensors (GO-coated and bare fiber), and photodetectors. Ethanol solutions were tested stepwise, and Fresnel reflection intensities were measured.
5：Data Analysis Methods:
Reflection intensities were recorded and analyzed to determine sensitivity and response times. Linear regression was used for data fitting.
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