采用多模光纤级联布拉格光栅的温湿度传感器

Temperature and humidity sensor using the multimode fiber cascaded Bragg grating

为了设计一种结构简单且能够同时测量温度和相对湿度的光纤传感器,制作了一种采用多模光纤串联布拉格光栅结构的光纤温湿度传感器。首先将6 mm的多模光纤与布拉格光栅连接,然后通过氢氟酸将多模光纤的直径腐蚀到60μm,最后在多模光纤上涂覆一层羧甲基纤维素水凝胶膜。对所制作的光纤传感器进行温湿度响应测试。实验结果表明,所设计的传感器湿度灵敏度约为69.6 pm/%相对湿度,温度灵敏度约为15 pm/℃。该传感器对温湿度响应灵敏,是一种结构简单且紧凑的温湿度同时测量传感器,可被广泛应用。

In order to design an optical fiber sensor with a simple structure which can simultaneously measure temperature and relative humidity,we use the multimode fiber cascade Bragg grating to form the basic structure of the sensor.First,a 6mm multimode fiber is connected to a Bragg grating.Then the diameter of the multimode fiber is etched to 40μm by hydrofluoric acid.Finally,a layer of carboxymethyl cellulose hydrogel is coated on the multimode fiber.The temperature and humidity response of the fabricated optical fiber sensor is tested.Experimental results show that the designed sensor has a humidity sensitivity of 69.6 pm/%RH and a temperature sensitivity of 15 pm/℃.The designed sensor is very sensitive to temperature and humidity,and has a good application prospect.