Trimethylamine detection by using gas sensors is very meaningful in the area of food inspection and environment monitoring. In those application occasions, however, how to compensate or calibrate the usually-inevitable humidity influence became an important issue in both sensor design and application phase. The response behavior of a QCM gas sensor based on polyaniline/TiO2 composite to trimethylarnine at different humidity atmosphere was studied. The results showed very linear sensitivity in all those conditions, and also indicated a pattern of sensor drift due to humidity. A mathematical response model with different concentration and humidity was built by using multiple nonlinear regression method,and this model was also used for calibrating humidity influence, resulting in a significant increasing of accuracy for concentration predicting.%用气敏传感器检测三甲胺在食品检验和环境监测等领域具有广泛意义,而湿度影响在这些实际应用中通常无法避免,如何补偿和校正湿度干扰是传感器设计和使用中的重要课题.考察了一种以聚苯胺/TiO2复合材料为敏感膜的QCM气敏传感器在干燥和不同湿度气氛中对三甲胺气体的响应特性,结果表明均呈现出良好的线性敏感性.发现了在湿度干扰下的传感器漂移规律,并通过多元非线性回归方法建立了一定浓度和湿度下的响应数学模型,计算表明用该模型可较大地提高湿度干扰下浓度估算的准确度.
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