Simulation Analysis of Ultrasonic Testing Based on Pulse Compression of Barker Coding for Concrete

In ultrasonic testing of concrete, structural noise caused by the heterogeneous structure of concrete materials is one of the important factors affecting the effectiveness of ultrasonic testing. In order to further improve the signal-to-noise ratio of ultrasonic testing signals, it is proposed to use Barker code signal as excitation signal, which has good autocorrelation characteristics and noise suppression advantages. A concrete structure model was designed and established for conducting simulation tests, and imaging processing and analysis of detection results. The imaging results by the proposed method were compared with those through the conventional Gaussian pulse reflection method. The results show that the spatiotemporal resolution of the detection signal is improved and related signal-to-noise ratio is enhanced because of the compressed pulse width and suppressed sidelobe in the detection signals. Moreover,with this method, the signal-to-noise ratio of the results is improved by 8.3 dB and the imaging quality is significantly promoted.