High performance solvent vapor identification with a two sensor array using temperature cycling and pattern classification
High performance solvent vapor identification with a two sensor array using temperature cycling and pattern classification
复制标题
DOI：
10.1016/s0925-4005(03)00404-0
复制
发表时间：
2003-10-15
影响因子：
8.4
通讯作者：
Schütze, A
中科院分区：
文献类型：
--
作者：
Gramm, A;Schütze, A
半导体气体传感器的温度调制是在必须识别不同气体的应用中提高气体传感器阵列的选择性和稳定性的有效策略[IEEE Sens.J.1(3)(2001)207；Sens.Actuator B 40(1997)33；Sens.Actuator B 43(1997)45；Anal.詹姆。学报361(1998)93；肛门。化学。68(1996)2067；感官执行机构B 33(1996)142]。最近的评论可以在[Sens.Actuator B 60(1999)35]中找到。我们提出了一种由两个商用金属氧化物气体传感器组成的阵列，允许在空气中从2到200ppm的广泛浓度范围内区分六种有机溶剂。在几个月的测试期内，温度循环大大减少了传感器基线漂移。附加的信号预处理抑制了湿度的影响，进一步减少了漂移。该系统包括评估在温度循环期间从传感器响应曲线生成的形状特征的分层模式分类，该形状特征与其他特征生成方法(如FFT和小波，另见[Sens.Actuator B 41(1997)105])进行比较。这种分类需要相对较少的计算能力，并允许灵活地适应不同的操作环境，例如，抑制干扰气体的虚假警报。使用四个具有相同传感器的系统来检查传感器性能的重复性。所有系统的分类都可以使用相同的特征，但分类区域必须适应各个传感器。(C)2003年，爱思唯尔科学公司出版。
Temperature modulation of semiconductor gas sensors is a powerful strategy to improve selectivity and stability of gas sensor arrays in applications where different gases have to be identified [IEEE Sens. J. 1 (3) (2001) 207; Sens. Actuators B 40 (1997) 33; Sens. Actuators B 43 (1997) 45; Anal. Chim. Acta 361 (1998) 93; Anal. Chem. 68 (1996) 2067; Sens. Actuators B 33 (1996) 142]. A recent review can be found in [Sens. Actuators B 60 (1999) 35]. We present an array composed of two commercial metal oxide gas sensors allowing discrimination of six organic solvents over a wide concentration range from 2 to 200 ppm in air. Temperature cycling reduces sensor baseline drift considerably over a test period of several months. Additional signal pre-processing suppresses the influence of humidity and leads to further drift reduction. The system comprises a hierarchical pattern classification evaluating shape features generated from the sensor response curve during temperature cycling, which are compared with other feature generation methods (like FFT and wavelet, see also [Sens. Actuators B 41 (1997) 105]). The classification requires comparatively little computing power and allows flexible adaptation to different operating environments, for example, to suppress false alarms from interfering gases. Reproducibility of sensor performance was checked using four systems with identical sensors. The same features can be used for the classification with all systems but the areas for classification have to be adapted to the individual sensors. (C) 2003 Published by Elsevier Science B.V.