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利用旋转-甩涂法(Spin-coating)将八乙基卟啉固定在K+交换玻璃光波导表面,制成八乙基卟啉膜/K+交换玻璃光波导敏感元件.利用该敏感元件考察不同有机挥发性气体的响应,同时优化了敏感元件的制备条件.结果表明,该敏感元件对甲胺具有较高的灵敏度,检出限(信噪比S/N=5.1)为1.0×10-8V/V0,响应时间为1.2s,恢复时间为2.3s,在平行试验中,其结果具有良好的线性关系,相对标准偏差为1.1％,证明了该元件对甲胺气体检测的准确性.“,”In this paper,an octaethylporphyrin film/K+ exchanged glass optical waveguide sensor was fabricated by spin-coating method immobilizing the octaethylporphyrin compound on K+ glass optical waveguide surface.The sensor was used to detect different volatile gases in optical waveguide detection system.Besides,the preparation conditions for the sensor were optimized.The experimental results showed that the sensor has a high sensitivity to methylamine.The detection limit was 1.0 × 10-8 V/Vo (S/N =5.1),and the response time and recovery time was 1.2 s and 2.3 s,respectively.There also existed a good linear relationship for the results obtained in the parallel experiment with the relative standard deviation of 1.1％,which proved the accuracy of the sensor in methylamine gas detection.