With annular phased array transducers a two dimensional image is built up by ______ rotating the ringed element array so that it transmits sound beams in ______ directions.

With annular phased array transducers a two dimensional image is built up by ______ rotating the ringed element array so that it transmits sound beams in ______ directions.

• A. Electronically; Same
• B. Mechanically; Parallel
• C. Physically; Different
• D. Randomly; Various

Answer: (C)

The ability to form a two-dimensional image with this type of transducer comes from mechanically rotating the ringed aperture. By turning the annular array, the transmitted sound beam points in different directions around the axis, providing angular diversity that, when combined, creates a 2D image. The concentric rings give good focusing characteristics, but the key for 2D coverage here is the physical rotation to sweep beams through various directions.

The ability to form a two-dimensional image with this type of transducer comes from mechanically rotating the ringed aperture. By turning the annular array, the transmitted sound beam points in different directions around the axis, providing angular diversity that, when combined, creates a 2D image. The concentric rings give good focusing characteristics, but the key for 2D coverage here is the physical rotation to sweep beams through various directions.