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Ultrasonic guided waves detection technology is a new nondestructive testing technology, and it can be used to detect the structural health of steel strands. Because of dispersion separation, it has great impact on the detection results, especially in long distance detection. This paper introduces a method of linear mapping technique for dispersion compensation. The effect of dispersion compensation can be achieved by reconstructing the linear dispersion curve instead of the nonlinear dispersion curve. This paper verifies the processing effect of dispersion compensation method from simulation and experiment while using a single-core rod as an example, and applies this method to the detection signal of steel strand. The results show that the method can focus the guided wave signal, and improve positioning accuracy and signal-to-noise ratio of detection.

Research on ultrasonic guided wave dispersion compensation for steel strand defect detection