The light wave is diffracted by the ultrasonic wave when it propagates in liquid medium, which is called
the optical diffraction caused by ultrasonic sound (also called acousto-optic effect). This phenomenon is the interactional result from light wave and sound wave in medium. The liquid density is modulated by the making the original liquid with even diaphaneity become the “ultrasonic grating” of which refractive ratio changes periodically. The diffraction phenomenon is to be produced when the light beam is passing through, wherefrom the propagation speed of sound wave in liquid can be measured accurately. The acousto-optic effect can be applied widely because the developing laser and ultrasonic techniques.Though ultrasonic grating experiment, the experimenter can get to know the experimental theory of optical effect, to learn to use the optical effect to measure the sound velocity in liquid and the application method of the micrometer ocular.
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