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The pulse inversion averaging (PIA) method is introduced to theshadowgraph imaging system to visualize the second-harmonic componentof the ultrasonicfield. The principle of the PIA method is summarized andthe method is customized for observing an second-harmonic ultrasonicfield.An experiment of a shadowgraph with PIA using a 1-MHz concave focusedtransducer is conducted to evaluate the system. The fundamental componentof 1 MHz is suppressed more than 30 dB with respect to the second-harmoniccomponent. With this system, both a normal shadowgraph image and asecond-harmonic image are visualized in real time

Optical observation method for ultrasonic field using the shadowgraph introducing pulse inversion averaging