Abstract
A novel detection system for second harmonic ultrasonic pulse waves is constructed by modifying an existing system using a double-layered piezoelectric transducer (DLPT). Two unique methods are introduced into the system, namely, the switching of the electrical connection of the DLPT and the pulse inversion excitation method, in which the DLPT is excited by both in-phase and out-of-phase pulses alternatively and averaged to cancel the fundamental and odd harmonic components. As a result of using these two methods, enhanced second harmonic waves are displayed on an oscilloscope in real time, and an improved sensitivity of 80 dB is obtained. Finally, drilled holes are imaged as an application of the new system and to demonstrate its usefulness.
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