研究目的
To determine the concentration of Nitrate at 0-50 ppm level in water using an etched Fiber Bragg Grating (FBG) sensor.
研究成果
The etched FBG sensor was able to trace the concentration of Nitrate in water, with the wavelength shifting directly proportional to the Nitrate concentration. The simplicity in fabrication, ease of use, and sensitivity to lower concentration enable FBG sensor to be used for measuring the Nitrate concentration in water, providing an alternative approach over conventional methods.
研究不足
The structure of the fabricated sensor became more fragile and weak after the etching process, requiring careful handling.
1：Experimental Design and Method Selection:
The study applied optical sensing technology using an etched FBG sensor to detect nitrate concentration in water. The sensor was etched using 48% Hydrofluoric (HF) acid solution.
2：Sample Selection and Data Sources:
Nitrate stock with 100 ppm concentration was prepared by dissolving anhydrous Potassium Nitrate (KNO3) powder with pure water, then diluted to produce samples of Nitrate concentration varying at 0-50 ppm.
3：List of Experimental Equipment and Materials:
Standard single mode FBG sensor, 48% HF acid solution, propanol solution, deionized (DI) water, acetone, broadband source, optical circulator, optical spectrum analyzer (OSA).
4：Experimental Procedures and Operational Workflow:
The acrylate coating of the fiber was stripped carefully along the 5mm sensor length, cleaned using propanol solution, and dried. The cladding at the sensing region was removed partially using wet etching method by immersing the sensor in 48% HF solution for 28 minutes. The sensor was then immersed in Nitrate concentration varying at 0-50 ppm for testing.
5：Data Analysis Methods:
The shift of Bragg wavelength was monitored before and after etching process, and during the experiment, the reflected Bragg wavelength was monitored while the solution was in contact with the sensor.
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