Abstract
A thin circular disc suspended by a quartz fibre tends to set itself broadside on to the direction of the propagation of incident sound waves, and its use in combination with resonators is well known as a means of measuring relative intensities of acoustic radiation fields. In a progressive or stationary wave in which the velocity amplitude is │ξ│, the average couple on a circular disc of radius
a
is usually given by the well-known formula L͞ = - ⅔ρ
0
a
3
│ξ│
2
sin 2α, (1) where ρ
0
is the density of the medium and α is the angle between the direction of propagation of the wave-front and the normal to the disc, while the negative sign indicates that the couple tends to diminish α.
Cited by
22 articles.
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