pH值与湿度的光纤传感器研究  

Study on Fiber Optic pH and Humidity Sensors

作　　者：罗鸣[1] 董飒英[2] 程文华[2] 李庆芬[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,哈尔滨150001 [2]海洋腐蚀与防护国防科技重点实验室

出　　处：《分析科学学报》2007年第1期25-29,共5页Journal of Analytical Science

摘　　要：本文采用溶胶凝胶法和包埋法分别将对pH值和湿度敏感的指示剂修饰在光纤纤芯表面，制成了具有较宽检测范围的光纤pH传感器和光纤湿度传感器。通过X射线能谱仪（EDX）对所制备的pH和湿度敏感膜的表面成分进行了分析，并采用光功率计对敏感膜进行了光学检测。结果表明：当pH值在4．5～13的范围内变化时，光输出功率与PH值近似呈线性变化规律；当相对湿度（RH）在25％～80％的范围内变化时，光输出功率与RH值近似呈线性变化规律，并且二者在其检测范围内均具有良好的可逆性。The fiber optic pH sensor was prepared by immobilizing a mixture of three pH-sensitive dyes （cresol red, bromophenol blue and chlorophenol red） on the surface of the fiber core using sol-gel technology. Additionally, the humidity sensitive indicator was embedded on the surface of the fiber core fabricating a long-range fiber optic humidity sensor. The composition of the sensitive films were analyzed by energy dispersive X-ray detector （EDX）. The results indicated that the pH sensor had a linear and reproducible pH response in the pH range from 4.5 to 13.0, and the humidity sensor had a similar response to the pH sensor in the ralative humidity range from 25% to 80%. Some optical tests were also carried out to testify the reversibility of the fiber optic pH and humidity sensors.

关 键 词：光纤化学传感器 溶胶凝胶 PH值 相对湿度 敏感膜 

分 类 号：O657.92[理学—分析化学] O657.3[理学—化学]