Optical Humidity Sensitive Composite Model of Sol-GelCeramic Films

摘要：

An optical humidity-sensitive composite model of the sol-gel ceramic films is presented based on Maxwell-Garnett and effective medium theory. The composite model is composed of the air medium, the ellipsoidal crystalline grain and the water layers. Under the humidity circumstance, the adsorption of water molecules on ceramic materials will induce an increase in thin film effective refractive index. In this work, the sol-gel derived SiO2 films are selected as humidity-sensitive materials. The relation between effective refractive index and relative humidity is drawn for different absorption factors and porosities. The results indicate that the lager the absorption factor is, the higher the refractive index is, and the refractive index of humidity-sensitive film SiO2 decreases with the increase of ceramic material porosity. Further, the theoretical simulation based the presented complex model is in agreement with the experimental humidity-sensing curve of A H Alberto.

关键词： humidity-sensitive mechanism optical humidity sensor composite model effective refractive indez

作者: GU Zhengtian WANG Zhenyuan WU Yingcai

作者单位: Lab.of Photo-Electric Functional Films, College of Science, University of Shanghai for Science and T College of Information, Guangdong Ocean University, Zhanjiang, 524025, China

会议类型: 国际会议

会议名称: 第八届国际测试技术研讨会(8th International Symposium on Test and Measurement)

会议地点: 重庆

会议语种:英文

页码: 2018-2021

在线出版日期: 2009-08-01（万方平台首次上网日期，不代表论文的发表时间）