Passive and Active Thin Film Strain Sensors for Earthquake Damage Assessment

967265欧拉这个研究项目是关于新的薄膜应变片的发展。 将采用三种方法。 第一种方法采用宽带隙半导体作为应变计中的有源传感元件，其中电阻率和吸收光谱可以用于监测应变。 这些材料是有吸引力的，因为它们具有良好的再现性，长期的环境和传感器稳定性，以及大的计量系数。 第二种方法将使用聚合物作为传感元件。 这些材料的光学响应也对应变敏感，有可能导致廉价的商品级有源应变元件。 最后，将开发新的聚合物，随着时间的推移存储综合应变，并可用于测量累积损伤的基板。 这方面的研究的发展依赖于能够方便地监测应变响应，如在地震，风，或车辆引起的结构振动，使用在项目的初始阶段开发的光学方法。 研究的成功结果将导致更便宜的应变计，由于薄膜的性质，可以应用于建筑物和基础设施材料，以监测应变并评估地震等灾难性事件期间的损坏。 ***

967265 Euler This research project is concerned with the development of new thin film strain gages. Three approaches will be used. The first employs wide band gap semiconductors as the active sensing element in a strain gage where both resistivity and absorption spectroscopy can be used to monitor the strain. These materials are attractive because they have good reproductivity, long term environmental and sensor stability, and large gage factors. The second approach will use polymers as the sensing element. The optical response of these materials is also sensitive to strain with the potential to lead to inexpensive, commodity level active strain elements. Finally, new polymers will be developed that store the integrated strain over time and can be used to measure accumulated damage to the substrate. The development of this aspect of the research relies on the ability to monitor the strain response conveniently such as during earthquake, wind, or vehicle induced structural vibrations using the optical methodology developed in the initial stages of the project. A successful outcome to the research will lead to cheaper strain gages that, because of the thin film nature, can be applied to buildings and infrastructure materials to monitor the strain and to assess the damage during a catastrophic event such as an earthquake. ***