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An investigation of the accuracy of König’s formula for the Rayleigh disk

1939; Royal Society; Volume: 171; Issue: 947 Linguagem: Inglês

10.1098/rspa.1939.0081

2053-9169

A. C. Merrington, C.W. Oatley,

Structural Health Monitoring Techniques

Since the introduction of the thermionic valve amplifier, the science of acoustics has been revolutionized and the need for accuracy in the measurement of acoustical quantities is becoming ever more important. The measurement of the intensity of sound has always presented grave difficulties, and while, at the present time, we possess several instruments with which intensities may be compared with considerable accuracy, the absolute measurement of intensity is still subject to a great deal of uncertainty. One of the most attractive methods of making such measurements was first proposed by the late Lord Rayleigh (1882) and is generally known as the Rayleigh disk method. When a thin circular disk is situated in a fluid stream, it experiences a torque tending to twist it so that its axis shall He in the direction of the stream.