Thin disk acoustic baffle system
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorMichael L. Barlow
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Abstract
A thin disk acoustic baffle comprising a thin disk of material having a uue combination of acoustical properties and dimensions to provide optimum attenuation of sound transmission between two points. Optimum sound attenuation is achieved by adjusting the thickness, diameter, and location of the thin disk relative to one of the points to be baffled and by selecting the material of the disk to have acoustic properties such that sound waves diffracted around the edges of the disk cancel the direct waves transmitted through the disk at a particular frequency of interest.
Claims2
The method of reducing or preventing the reception of acoustic waves in a single given direction at a specific frequency by an acoustic receiver by interposing a thin circular solid disk between said receiver and the source of said acoustic waves where the diameter, the thickness, the material, and the location relative to the receiver of said disk have been selected to be in the proper relationships with each other to achieve a condition whereby the acoustic waves diffracted around said disk cancel the direct waves transmitted through said disk at the location of said receiver.
A thin disk acoustic baffle system for isolating a receiver in sea water from a waveform having a frequency of 25 KHz comprising:
- (a) a thin disk having a diameter of about 12 inches, a thickness of about 0.063 inches and made of lead;
- and
- (b) said receiver positioned along the center axis of said disk and about 6 inches behind said disk.
Dependencies are inferred from the claim text.