Ultrasonic grating | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-07-02

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Ultrasonic_grating


00:00:38 1 Mechanism
00:01:36 2 Mathematics
00:03:31 3 Debye-Sears method



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SUMMARY
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An ultrasonic grating is a type of diffraction grating produced by interfering ultrasonic waves in a medium altering the physical properties of the medium, and hence the refractive index, in a grid-like pattern.  The term acoustic grating is a more general term that includes operation at audible frequencies.
An ultrasonic wave is a sound wave at a frequency greater than 20 kHz. The human ear cannot recognize ultrasonic waves, but animals such as bats and dogs can. Ultrasonic waves can be produced by the Piezo-electric effect and magnetostriction.