In this study, a novel and simple optical fiber sensor is proposed, simulated, and experimentally demonstrated for simultaneous measurement of high refractive index (RI) and temperature. The sensor consists of a section of single-mode-silica rod-single-mode (SSRS) fiber structure cascaded to fiber Bragg grating (FBG) (SSRS-FBG). The simultaneous measurement of high RI and temperature was realized in this study by monitoring the output power level and wavelength shift of the SSRS-FBG single dip transmission spectrum corresponding to different surrounding high RI and ambient temperature values. The experimental results showed that the cascaded sensor had a sensitivity of 108.07 dBm/RIU for high RI ranging at 1.45-1.531, while the temperature sensitivity was 9.31 pm/°C from 35 °C to 85 °C. This sensor is most suitable for high RI applications, such as for monitoring oil quality stored in terminal and power transformers.

中文翻译：

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基于SSRS-FBG的高折射率和温度同时测量

在这项研究中，提出、模拟并实验证明了一种新颖且简单的光纤传感器，用于同时测量高折射率 (RI) 和温度。该传感器由一段级联到光纤布拉格光栅 (FBG) (SSRS-FBG) 的单模硅棒单模 (SSRS) 光纤结构组成。在本研究中，通过监测与不同的周围高 RI 和环境温度值对应的 SSRS-FBG 单倾角透射光谱的输出功率电平和波长偏移，实现了高 RI 和温度的同时测量。实验结果表明，级联传感器对于 1.45-1.53​​1 范围内的高 RI 具有 108.07 dBm/RIU 的灵敏度，而从 35°C 到 85°C 的温度灵敏度为 9.31 pm/°C。该传感器最适合高 RI 应用，