Abstract A temperature and humidity sensor based on photonic crystal fiber(PCF) coated with graphene oxide (GO) cascaded with two spherical structures is presented and demonstrated. The principle of this sensor is based on Mach–Zehnder interferometer (MZI), and the interference spectrum is sensitive to the change of temperature and humidity. Because of the hydrophilic property of GO, refractive index (RI) of the fiber surface changes significantly with the variation of humidity. Therefore, the GO film deposited on the PCF surface can improve the humidity sensitivity of the sensor. Experimental results show that the temperature sensitivities are 0.063 nm/°C and 0.086 nm/°C from 10°C to 70°C. The humidity sensitivities are 0.128 nm/%RH and 0.159 nm/%RH from 30% to 70%. Moreover, it also contains the following advantages: low cost, simple construction, and high sensitivity.

中文翻译：

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基于氧化石墨烯涂层光子晶体光纤的光纤温湿度传感器

摘要 提出并演示了一种基于光子晶体光纤（PCF）涂层的氧化石墨烯（GO）级联两个球形结构的温湿度传感器。这种传感器的原理是基于马赫-曾德干涉仪（MZI），干涉光谱对温度和湿度的变化很敏感。由于GO的亲水性，纤维表面的折射率（RI）随着湿度的变化而显着变化。因此，沉积在PCF表面的GO薄膜可以提高传感器的湿度灵敏度。实验结果表明，从 10°C 到 70°C，温度灵敏度分别为 0.063 nm/°C 和 0.086 nm/°C。湿度灵敏度为 0.128 nm/%RH 和 0.159 nm/%RH，范围为 30% 至 70%。此外，它还包含以下优点：成本低，