Microfabricated sol-gel relative humidity sensors for soil suction measurement during laboratory tests
Microfabricated sol-gel relative humidity sensors for soil suction measurement during laboratory tests
复制标题
用于实验室测试期间土壤吸力测量的微加工溶胶-凝胶相对湿度传感器
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发表时间：
2017
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通讯作者：
L. Ilharco
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作者：
R. Cardoso;G. Sarapajevaite;Oleksandr M. Korsun;S. Cardoso;L. Ilharco
目前还没有小型传感器可以安装在土壤样本中进行实验室测试，以监测装载过程中的水运输。这对于更好地理解土体的流体力学耦合行为是一个重要的限制。在洁净室环境中微制造的溶胶-凝胶相对湿度传感器(11 mm×11 mm)被设想在标准实验室测试中被并入土壤样品中。该传感器的工作原理是通过溶胶-凝胶技术在间距为300μm的交叉指状铝电极上沉积一层掺Ce的二氧化硅-二氧化钛薄膜，以检测其电阻率的变化。据作者所知，用于测量相对湿度的溶胶-凝胶传感器从未在土壤中使用过；因此，这是一种新的应用。用该传感器测定了压实高岭土的持水曲线，并与WP4-C水露点电位计测得的曲线进行了比较。传感器还被安装在固结测定器单元中进行了测试，...
Currently there are no small sensors that can be incorporated inside soil samples for laboratory testing, to monitor water transport during loading. This is an important limitation to a better understanding of the hydromechanical coupled behaviour of soils. A sol-gel relative humidity sensor (11 mm × 11 mm), microfabricated in a clean room environment, was conceived to be incorporated in soil specimens during standard laboratory tests. The sensor operates based on changes in electrical resistivity detected by a cerium-doped silica–titania film deposited using a sol-gel technique over interdigitated aluminium electrodes spaced at 300 μm. To the best of the authors’ knowledge, sol-gel sensors for relative humidity measurement have never been used in soils; therefore, this is a novel application. The water retention curve of compacted kaolin was measured with the sensors and compared with the curve found using water dewpoint potentiometer WP4-C. The sensors were also tested incorporated in an oedometer cell,...