An Imaging Processing Method for Stress Wave Reflection Period Extracting to Measure Guardrail Column Length
Publication: Earth and Space 2021
ABSTRACT
The depth of the highway guardrail column is directly related to the safety of the driver’s life and property. The traditional method of pulling piles destroys the original roadbed and takes time and effort. As a nondestructive testing method, stress wave reflection method is widely used in structural size and structural integrity testing. However, for the traditional stress wave reflection method, the interpretation of the waveform mainly depends on the experience of the operator, and there is a larger error in the pile detection results. This paper proposed a reflection period extraction method based on image processing. Firstly, the time-frequency diagram obtained by wavelet denoising, multiple selfcorrelation, and short-time Fourier transform. Secondly, edge detection, binary filtering, and column pixel mean statistics are performed on the time-frequency diagram. Finally, the dominant frequency of the statistical signal is extracted by the fast Fourier transform, and the reflected wave period is obtained accordingly. Experiment proved that the algorithm can effectively extract the reflection period and accurately measure the length of the guardrail column.
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Earth and Space 2021
Pages: 261 - 270
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© 2021 American Society of Civil Engineers.
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Published online: Apr 15, 2021
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