Concrete crack depth detection and complex signal analysis based on tracer electromagnetic method

Crack depth detection is a technical challenge. The traditional detection method has the problems of insufficient accuracy and low detection efficiency. In addition, the conventional interpretation method of radar signal profile is easily disturbed by the noise signal generated by the complex structure inside the concrete. To solve these problems, this paper proposes a new concrete crack depth detection method and complex signal analysis technology based on the combination of indicator and radar. In this paper, the detection principle of tracer electromagnetic method and the principle of complex signal analysis are described in detail. The finite time domain difference method is used to simulate the numerical model, and the complex signal analysis technology is used to analyze the forward results. A high dielectric liquid indicator was prepared, deep crack and shallow crack depth detection tests were carried out by using the indicator. The crack depth information was determined by complex signal analysis. The test data were compared with the actual depth of the specimen to evaluate the effectiveness and accuracy of the method. Using the complex signal analysis technology, it is more convenient to clearly observe the crack morphology distribution and accurately locate the bottom position of the crack.