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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.

本研究采用基于二氧化硅的布拉格光栅（silica-based Bragg gratings），对航空煤油（Jet A-1）中的水污染物进行量化表征。该光学传感器构型将导模（guided mode）的倏逝光场（evanescent optical field）暴露，以实现折光测量（refractometery）。研究不仅观测到与水滴乳化和斯托克斯沉降（Stokes’ settling）相符的光谱特征，同时完成了定量分析。测试覆盖了22℃至-60℃区间内的升降温循环过程。水污染物的最大光谱灵敏度可达2.4 pm/ppm-v，分辨率低于5 ppm-v。