将具有溶致变色特性的 4’- N,N-二甲氨基黄酮基团与聚丙烯酰胺膜基体一起共价固定化在石英玻片上 ,制成了测定水的光导纤维化学传感器。传感是基于水对膜的荧光有强的猝灭作用。文中提出了猝灭方程。传感器具有好的可逆性和稳定性 ,重复测定含水 4.0 0 %和 1 6 .0 %的乙醇样品的相对标准偏差分别为 0 .33%和 0 .6 0 % ,这说明传感器还具有好的重现性。传感器用于 95 %乙醇中水分的含量测定 ,结果与气相色谱法一致。 The 4’-N, N-dimethylaminoflavone group having lyotropic properties was covalently immobilized on a quartz slide glass together with a polyacrylamide film matrix to prepare an optical fiber chemical sensor for measuring water. Sensing is based on the strong quenching effect of water on the fluorescence of the membrane. In this paper, the quenching equation is proposed. The sensor has good reversibility and stability. The relative standard deviations (RSDs) of repeated measurements of 4.0% water and 16.0% ethanol samples were 0.33% and 0.6%, respectively, indicating that the sensor also has good weight Reality Sensor for the determination of 95% ethanol in water, the results consistent with the gas chromatography.