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This work quantifies water contamination in jet fuel (Jet A-1), using silica-based Bragg gratings. The optical sensor geometry exposes the evanescent optical field of a guided mode to enable refractometery. Quantitative analysis is made in addition to the observation of spectral features consistent with emulsification of water droplets and Stokes’ settling. Measurements are observed for cooling and heating cycles between ranges of 22oC and -60oC. The maximum spectral sensitivity for water contamination was 2.4 pm/ppm-v with a resolution of < 5 ppm-v.

本研究对喷气燃料（Jet A-1）中的水污染进行了量化分析，采用基于二氧化硅的布拉格光栅。光学传感器几何结构揭示了导模的衰逝光场，以实现折射率测量。在观察与水分滴乳化及斯托克斯沉降相一致的光谱特征的同时，进行了定量分析。测量在22°C至-60°C的温度范围内进行，冷却和加热循环。对于水污染的最大光谱灵敏度达到2.4 pm/ppm-v，分辨率小于5 ppm-v。