介绍了玻璃光波导的结构、工作原理、制作方法及其在检测挥发性有机气体中的应用,即过氧聚钨酸薄膜/钾离子交换玻璃光波导气体传感元件的研制过程.结果表明,所研制的传感元件能检测的甲苯蒸汽的体积比为5×10-5,体积比在5×10-5～1×10-2范围内有良好的线性关系(R=0.9940),该传感元件具有可逆性好、容易制备、操作方便、成本低廉等特点. The structure, working principle and manufacturing method of glass optical waveguide and its application in the detection of volatile organic gases are introduced, that is, the research of the process of the peroxopolytungstic acid film / potassium ion exchange glass optical waveguide gas sensing element.The results show that, The volume fraction of toluene vapor detected by the developed sensor element is 5 × 10-5 and the volume ratio is in the range of 5 × 10-5 ~ 1 × 10-2 (R = 0.9940) Sensory element has reversible, easy preparation, easy operation, low cost and so on.