Calculated Azimuthal Directivity Patterns for Several Frequencies Used in Scanning Sonars.
NAVY UNDERWATER SOUND LAB NEW LONDON CONN
Pagination or Media Count:
This memorandum presents calculated directivity patterns, for several frequencies, for scanning sonars that have 48 stave transducers and use 12 or 16 staves for forming the acoustic beams. Constant time delay type beam forming networks were assumed in the computations for one set of patterns, constant phase shift type beam forming networks for the other. The shading used in the 16 stave calculations includes a cosine squared function and the shading derived from a typical single stave beam pattern the shading for the 12 stave calculations is based on only single stave shading. The computations assumed that transducer staves were spaced a half wave length apart for 5 Kc.. The basic computations were made by the Theory and Analysis Branch of the Laboratory.
- Acoustic Detection and Detectors