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A Novel Method for the Remote Detection of Debonding in FRP-Strengthened Concrete: Acoustic-Laser Vibrometry

机译：FRP加固混凝土中脱胶远程检测的一种新方法：声波激光测振

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摘要

The measurements show that the acoustic-laser vibrometry system is capable of detecting a delamination or void at the FRP-concrete interface in an FRP-retrofitted concrete system. In a laboratory environment, the acoustic-laser vibrometry system provides a very large SNR for the detection of defects. This implies that even in less than ideal conditions when testing structures in the field, real defects should still exhibit enough response to be detected. Standoff capability of the system was demonstrated as the specimen was measured at a distance. Measurements under varying conditions were also conducted to determine the effects of sound pressure level, laser signal level, angle of incidence, dwell time, and defect size. The system shows great promise for being an effective methodology for the detection of defects at the FRP-concrete interface in FRP-retrofitted concrete with the potential for a new testing methodology in practice.
机译：测量结果表明，激光激振系统能够检测FRP翻新混凝土系统中FRP-混凝土界面处的分层或空隙。在实验室环境中，声激光振动测量系统可提供非常大的SNR以检测缺陷。这意味着即使在现场测试结构的条件不理想时，实际缺陷仍应显示出足够的响应以进行检测。当在一定距离处测量样品时，证明了该系统的防脱能力。还进行了在不同条件下的测量，以确定声压级，激光信号级，入射角，停留时间和缺陷尺寸的影响。该系统有望成为一种有效的方法来检测FRP翻新混凝土中FRP-混凝土界面处的缺陷，并有可能在实践中采用新的测试方法。

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