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Study on sensitivity improving of fiber Bragg grating based pH sensor

机译：基于光纤布拉格光栅的pH传感器的灵敏度提高研究

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摘要

The key factor of the sensitivity in the FBG-based pH sensor is analyzed in detail. A multi-thin-layer structure of the gel coated cover was proposed and implemented with a special process. The sensors with the coated thickness of 420 μm, 500 μm, and 580 μm were built up, respectively. The corresponding spectral shifts of 0.08 nm, 0.13 nm, and 0.22 nm were detected when the pH sensors were soaked in the pH value of 3–9. Meanwhile, the sensor with the gel layer thickness of 580 μm was measured in the optimum measurement time period with the pH value changing from 3–12, in which the detected sensitivity of 52 pm/pH was achieved in the pH range of 6–12.
机译：详细分析了基于FBG的pH传感器中灵敏度的关键因素。提出了一种凝胶涂层覆盖物的多层结构，并采用了特殊工艺。分别构建了涂层厚度为420μm，500μm和580μm的传感器。当将pH传感器浸泡在3–9的pH值中时，可以检测到0.08 nm，0.13 nm和0.22 nm的相应光谱偏移。同时，在最佳测量时间段内测量了凝胶层厚度为580μm的传感器，pH值在3–12范围内变化，其中在6–12的pH范围内检测到的灵敏度为52 pm / pH 。

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