Abstract In this paper, a carboxymethyl cellulose (CMC)/carbon nanotubes (CNTs) composite film was manufactured and used as a good humidity sensitive material to design a humidity and temperature simultaneous measurement sensor with simple structure, high sensitivity and fast response time. The sensor is constructed by a fiber Bragg grating (FBG) and then connected a hollow-core fiber (HCF) on the end face of which coated a CMC/CNTs hydrogel composite film. Through contrast experimental tests, the results show that the humidity sensitivity of the sensor with CMC film is 170.55 pm/%RH, while the sensitivity of the sensor with CMC/CNTs composite film is 230.95 pm/%RH. The humidity-insensitive FBG can be used to obtain accurate temperature information, and the temperature sensitivity is 26.35 pm/°C. This paper not only proves that CMC is an excellent humidity sensitive material for optical fiber sensors but also proves that carbon nanotubes can increase the humidity sensitivity of the hydrogel film effectively. This temperature and humidity simultaneous measurement sensor has a good application prospect.

中文翻译：

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基于羧甲基纤维素/碳纳米管复合薄膜的光纤传感器同时测量相对湿度和温度

摘要 本文制备了一种羧甲基纤维素（CMC）/碳纳米管（CNTs）复合薄膜，并将其作为一种良好的湿敏材料，设计了一种结构简单、灵敏度高、响应时间快的温湿度同时测量传感器。该传感器由光纤布拉格光栅（FBG）构成，然后在其端面连接空芯光纤（HCF），其端面涂有CMC/CNTs水凝胶复合膜。通过对比实验测试，结果表明，CMC薄膜传感器的湿度灵敏度为170.55 pm/%RH，而CMC/CNTs复合薄膜传感器的湿度灵敏度为230.95 pm/%RH。湿度不敏感FBG可用于获取准确的温度信息，温度灵敏度为26.35 pm/°C。本文不仅证明了CMC是一种优良的光纤传感器湿敏材料，而且证明了碳纳米管可以有效提高水凝胶薄膜的湿敏性。这种温湿度同步测量传感器具有很好的应用前景。