SOME GUIDELINES FOR SONAR BAFFLE DESIGNS
TRACOR INC AUSTIN TX
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The problem of sonar baffle design is examined analytically by developing expressions for the total sound field behind a baffle as a result of diffraction around and transmission through a baffle. The total sound field can be calculated using a digital computer and includes the effects of a finite bandwidth source, a source which has a finite spatial distribution and the alteration of the actual spatial extent of the source by a sonar dome. A study of the effects of the transducer as an object of finite size on the sound field has not yet been concluded. It is shown that the sound field behind the baffle can interact with the beam forming process. For the transducer-baffle arrangements now in use, this interaction can produce coherent noise signals both fore and aft. For active sonars this interaction results in spokes on a PPI presentation. It is concluded that the problem of sound transmission through the baffle does not require further investigation until the diffraction effects have been established quantitatively. It is not necessary or practical to reduce transmission much below the diffracted noise levels, and this may be possible with materials now available. Some additional promising investigations are also mentioned in this report.
- Acoustic Detection and Detectors