M-cresol purple-polyvinylpyrrolidone(m-CP-PVP)composite film components was fixed on K+glass opti-cal waveguide surface with the method of spin-coating. We studied the UV-visible absorption spectrum variation of the different compound ratio of m-cresol purple-polyvinylpyrrolidone composite film/K+exchange glass optical wave-guide sensor before and after reacting with acidic and volatile organic compounds gases,and on the basis of study-ing the sensor response of acidic and volatile organic compounds gases in the optical waveguide detection system. The sensitive film was changed from yellow to red when it reacted with acidic gases. The sensor can detect H 2S with the volume concentration which is lower than 1×10-10(1.41×10-4 mg/m3),response and recovery time are 1.1 s and 8.5 s,andS/N is 15.43;and SO2 is lower than 1×10-10(2.66×10-4 mg/m3),response and recovery time are 0.4 s and 2.7 s,and S/N is 5.88. Meanwhile,the thickness of m-CP-PVP composite film is 199 nm±5 nm.%利用旋转甩涂法(Spin-Coating)将间甲酚紫-聚乙烯吡咯烷酮复合薄膜固定在K+交换玻璃光波导表面研制了光波导敏感元件.研究了不同复合比例的间甲酚紫-聚乙烯吡咯烷酮复合薄膜与酸性和挥发性有机气体作用前后的紫外可见吸收光谱变化,并在此基础上研究了该敏感元件在光波导测试系统中对酸性和挥发性有机气体的响应.敏感薄膜与酸性气体作用后,薄膜由黄色变为紫红色.该敏感元件能检测到体积比浓度低于1×10-10(1.41×10-4 mg/m3)的H2S,响应和恢复时间分别为1.1 s和8.5 s,信噪比S/N为15.43;能检测到体积比浓度低于1×10-10(2.66×10-4 mg/m3)SO2气体,响应和恢复时间分别为0.4 s和2.7 s,信噪比S/N为5.88.间甲酚紫-聚乙烯吡咯烷酮复合薄膜厚度为199 nm±5 nm.
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