Sketch the formation of Acoustic Grating
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How acoustic grating is formed?
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When ultrasonic waves travel through a transparent liquid, due to alternate compression and reaction, longitudinal stationary waves are produced. If monochromatic light is passed through the liquid perpendicular to these waves, the liquid behaves as a diffraction grating. Such a grating is known as Acoustic Grating.
Construction;
It is consists of a glass tank, filled with liquid. A piezo-electric (Quartz) is fixed at the bottom of the glass tank and is connected with a piezo-electric oscillatory circuit as shown in figure 1.7.
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