Presented in this paper is a fiber optic sensing probe that measures the refractive index of liquid with negligible temperature crosstalk. This sensor was fabricated by femtosecond laser micro machining. The sensitivity is 885.437 to 1,067.525 nm/RIU when the ambient refractive index varies from 1.3166 to 1.4346 at 1550 nm. The refractive index dependence on temperature of water was measured and compared with the theoretical result. A maximum refractive index at around 4 °C was detected in water. The refractive index dependence on temperature of ethanol, methanol, and acetone was also measured at 1550 nm. The result of methanol given by our measurement agrees well with the previously published literature, but a significant difference was found with the estimated thermo-optic coefficient in another research.

本文介绍的是一种光纤传感探头，该探头可在温度串扰可忽略不计的情况下测量液体的折射率。该传感器是通过飞秒激光微加工制造的。当环境折射率在1550 nm处从1.3166变为1.4346时，灵敏度为885.437至1,067.525 nm / RIU。测量折射率对水温的依赖性，并将其与理论结果进行比较。在水中检测到约4°C的最大折射率。还在1550 nm下测量了乙醇，甲醇和丙酮对温度的折射率依赖性。通过我们的测量得出的甲醇结果与先前发表的文献非常吻合，但是在另一项研究中，估计的热光系数却存在显着差异。