Thin fouling ultrasonic testing signal analysis and identification method

Fouling detection for heat exchange equipment is of great importance to ensuring normal industry production. Ultrasonic time-domain reflectometry technology is used to realize directive fouling monitoring. Due to the existing problems, for examples, the fouling layer of equipment is thin, echo is overlapped and cluttered, and the acquired reference signal is not exact matching, the method of frequency-domain inverse filtering combined with high order cumulant MUSIC spectrum estimation is proposed for overlapped signal analysis. The iterative method is used in the frequency-domain to modify the channel model, increasing the accuracy and practicability of the parameter extraction. The feasibility of this method is also verified through the analysis of the simulation and measured signals.