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本文介绍了一种利用平面光波导传感器快速检测二甲胺水溶液的新方法.以甲酚红嵌入的二氧化硅凝胶膜作为传感材料,通过传感材料与胺类溶液接触后发生颜色变化,引起输出光强度变化,进而得到被测物及其浓度的有关信息.在实验中利用溶胶-凝胶法制备了对二甲胺水溶液有光学响应的光波导传感元件,室温下测定其敏感特性.测试结果表明,该敏感元件对二甲胺水溶液有快速的响应.响应时间和恢复时间分别是4s和18 s,且在0.04～220 mg/m3浓度范围内对二甲胺水溶液呈现良好的线性关系(R2=0.9913),与其他检测方法相比,本方法检出限(S/N=4.2)较低,为0.04 mg/m3.“,”In this paper,a new method for the rapid detection of dimethylamine in aqueous solution using planar optical waveguide sensor is introduced.The silica gel film embedded with cresol red is used as the sensing material.The output intensity changes after the contact of the sensing material with the amine liquid,which provides information about the composition and concentration.In the experiment,an optical waveguide sensing element having an optical response to dimethylamine in the aqueous solution was prepared by sol-gel method,and its sensitivity was measured at room temperature.The results show that the sensitive element has a fast response to the aqueous solution of dimethylamine.Response time and recovery time are 4 s and 18 s,respectively.The sensor shows a good linear response in the range from 0.04 mg/m3 to 220 mg/m3 (R2 =0.9913).Compared with other detection methods,this sensor has a lower detection limit(S/N=4.2) of 0.04 mg/m3.