Artificial Reflector for Setting up a Flaw Detector that Implements an Acoustic Waveguide Method for Monitoring Composite Reinforcement

A method for applying an artificial reflector to a long object without destroying its body is proposed. It allows developing a tuning sample for a waveguide control method while simplifying the method for applying an artificial reflector. A computational model has been developed based on existing methods for evaluating the spectral properties of signals reflected and passed through sections with a cross-section difference. The model allows you to estimate the amplitudes of echo signals depending on the artificial reflector's height and length. Results of modeling and experimental studies of the effect of the artificial reflector overall dimensions on the echo signal are presented. It is shown that the maximum echo signal is achieved when the length of the artificial reflector is 19 % less than the value corresponding to the criterion of a quarter of the wave resonance. The amplitude of the artificial reflector is 1.2...1.3 times less than the percentage of the area increasing. As the area in the reflector zone increases, the differences grow due to decreasing its transparency coefficient. The obtained dependencies allow us to estimate the internal size of the echo signal by the amplitude and visible length of the defect. The proposed method is characterized by high accuracy and efficiency. It allows for increasing the reliability of the waveguide method for monitoring long objects made of polymer composite materials (rod, pipe, armature).