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Title |
Research on Automatic Detection of Ultrasonic Arrival Time in Concrete Using STA/LTA Algorithm
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Authors |
이승현(Seunghyun Lee) ; 이주원(Juwon Lee) ; 최하진(Hajin Choi) ; 강현구(Thomas H.-K. Kang) |
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DOI |
https://doi.org/10.4334/JKCI.2024.36.2.133 |
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Keywords |
도착시간 자동 추출 알고리즘; STA/LTA 알고리즘; 초음파 속도법; 직접법; 간접법 automatic arrival time picking algorithm; STA/LTA algorithm; ultrasonic pulse velocity; direct method; indirect method |
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Abstract |
In this study, the STA/LTA algorithm with a specific time interval applied randomly for determining signal arrival time in concrete was developed and validated. The performance evaluation included comparing deviation values of the AIC (akaike information criterion), Hinkley Criterion, and Amplitude Threshold-picker algorithms, as well as the STA/LTA algorithm with a specific time interval applied randomly. This comparison relied on ultrasonic signals measured through both direct and indirect methods in models of non-reinforced and reinforced concrete. The signals were measured in simulations and experiments using the Comsol Multiphysics software along with actual UPV equipment. Following this, a comparison of the results between non-reinforced and reinforced concrete was conducted to assess the impact of material heterogeneity on the signals. Additionally, a comparison between the direct and indirect methods was performed to evaluate the effect of the indirect method on ultrasonic signals. As a result, the STA/LTA algorithm with a specific time interval applied randomly setting exhibited superior performance compared to other algorithms. It had lower bias values, especially in simulations as opposed to experiments, in non-reinforced concrete compared to reinforced concrete, and with the direct method rather than the indirect method.
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