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Experimental assessment of an RFID-based crack sensor for steel structures

机译：钢结构RFID裂缝传感器的实验评估

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The use of welded steel cover plates had been a common design practice to increase beam section capacity in regions of high moment for decades. Many steel girder bridges with cover plates are still in service. Steel girder bridges are subject to cyclic loading, which can initiate crack formation at the toe of the weld and reduce beam capacity. Thus, timely detection of fatigue cracks is of utmost importance in steel girder bridge monitoring. To date, crack monitoring methods using in-house radio frequency identification (RFID)-based sensors have been developed to complement visual inspection and provide quantitative information of damage level. Offering similar properties at a reduced cost, commercial ultra-high frequency (UHF) passive RFID tags have been identified as a more financially viable option for pervasive crack monitoring using a dense array of sensors. This paper presents a study on damage sensitivity of low-cost commercial UHF RFID tags for crack detection and monitoring on metallic structures. Using backscatter power as a parameter for damage identification, a crack sensing system has been developed for single and multiple tag configurations for increased sensing pervasiveness. The effect on backscatter power of the existence and stage of crack propagation has been successfully characterized. For further automation of crack detection, a damage index based on the variation of backscatter power has also been established. The tested commercial RFID-based crack sensor contributes to the usage of this technology on steel girder bridges.
机译：焊接钢盖板的使用是一种常见的设计实践，以增加几十年的高时地区的梁段容量。许多带盖板的钢梁桥仍在使用中。钢梁桥均受循环载荷，可在焊缝的脚趾上引发裂缝形成，并降低光束容量。因此，及时检测疲劳裂缝在钢梁梁桥监测方面至关重要。迄今为止，已经开发出使用内部射频识别（RFID）的传感器的破解监测方法以补充目视检查并提供损坏水平的定量信息。以降低的成本提供类似的性质，商业超高频（UHF）被动RFID标签已被确定为使用密集的传感器普遍存在的裂纹监测更具资金上可行的选择。本文介绍了低成本商业UHF RFID标签损坏敏感性，用于金属结构的裂纹检测和监测。使用反向散射电源作为损坏识别的参数，已经为单个和多标签配置开发了裂缝感测系统，以增加感测普遍性。成功地表征了对裂缝扩展存在的反向散射力的影响。为了进一步自动化裂缝检测，还建立了基于反向散射电力变化的损伤指数。基于经过测试的商业RFID的裂缝传感器有助于使用该技术在钢梁桥桥上。

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