Investigation of the Humidity Effects on SnO_2-Based Sensors in CO Detection

机译：CO检测中基于SnO_2的传感器的湿度影响研究

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An algorithm for compensating water vapor pressure in CO detection is proposed here and tested on SnO_2 thick-film gas sensors. For each sensor working at a fixed temperature, the conductance, G, is fitted by an analytical surface, whose expression can be inverted to determine the CO concentration once the water partial pressure is measured. As soon as the rate of water-vapor pressure change is slower than about 300 Pa/min, G is a function of the temperature, water vapor and CO concentration. If quicker water vapor variations occur instead, the sensing film undergoes a non-negligible transitory phenomenon during which G assumes different values even at fixed water vapor pressure and temperature. This phenomenon prevents the compensation from working properly. An explanation of the behavior is offered by the interpretation of kinetics equations at surface.

机译：本文提出了一种补偿CO检测中水蒸气压力的算法，并在SnO_2厚膜气体传感器上进行了测试。对于在固定温度下工作的每个传感器，电导率G都由一个分析表面拟合，一旦测量了水的分压，该分析表面的表达式就可以反转以确定CO浓度。一旦水蒸气压力的变化速率低于约300 Pa / min，G便是温度，水蒸气和CO浓度的函数。如果代替地出现更快的水蒸气变化，则感测膜将经历不可忽略的过渡现象，在此期间，即使在固定的水蒸气压力和温度下，G也会呈现不同的值。这种现象使补偿无法正常工作。通过对表面动力学方程的解释来提供对行为的解释。

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《Symposium Proceedings vol.915; Symposium on Nanostructured Materials and Hybrid Composites for Gas Sensors and Biomedical Applications; 20060418-20; San Francisco,CA(US)》|2006年|P.249-255|共7页
会议地点 San FranciscoCA(US)
作者
Cesare Malagu; Michele Benetti; Maria Cristina Carotta; Alessio Giberti; Vincenzo Guidi; Luciano Milano; Giuliano Martinelli;
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Physics, University of Ferrara, via Saragat 1/c, Ferrara, 44100, Italy;

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正文语种 eng
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Investigation of the Humidity Effects on SnO_2-Based Sensors in CO Detection

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