Abstract
Visualization of ultrasonic wavefronts at 2.0–2.5 MHz is demonstrated by using the interference of two diffracted beams. For relatively narrow ultrasonic beams with sufficiently high intensity, light is scattered as the Raman-Nath diffraction to generate multiple diffracted beams. Two beams of neighboring diffraction orders are detected, the result of which exhibits interference fringes in the images. It is proven, both theoretically and experimentally, that these fringe patterns are identical to the wavefront patterns of ultrasound. Bright images with wavelength-filtered xenon stroboscopic illumination were obtained for ultrasonic beams of several mm-beamwidths.
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