High energy, low frequency, ultrasonic transducer

摘要: A wide bandwidth, ultrasonic transducer to generate nondispersive, extensional, pulsed acoustic pressure waves into concrete reinforced rods and tendons. The wave propagation distance is limited double the length of rod. impedance matched rod for maximum transfer energy. efficiency approximately 60 percent, depending upon type active elements used in transducer. input energy is, example, 1 mJ. Ultrasonic reflections will occur at points along where there are changes one percent a wavelength diameter. reduction diameter reflect phase reversed echo, as compared with reflection from an incremental increase Echo signal processing stored waveform permits reconstruction those echoes image has use inspection long (40+foot) architectural reinforcements structural supporting members, such bridges dams.