Which transducer configuration uses multiple rows of elements to improve elevational focusing?

Which transducer configuration uses multiple rows of elements to improve elevational focusing?

• A. Phased array
• B. 1.5D or multi-row array
• C. Mechanical sector
• D. Linear array

Answer: (B)

Elevational focusing is improved by having an aperture across multiple rows of elements. A 1.5D or multi-row array stacks several rows, allowing electronic focusing in the elevation direction in addition to lateral focusing. This creates a thinner, more precise focal zone and better elevational resolution. In contrast, a phased (1D) array mainly focuses and steers in the plane, a mechanical sector relies on fixed mechanical steering with limited elevation control, and a linear (single-row) array has little to no elevational control.

Elevational focusing is improved by having an aperture across multiple rows of elements. A 1.5D or multi-row array stacks several rows, allowing electronic focusing in the elevation direction in addition to lateral focusing. This creates a thinner, more precise focal zone and better elevational resolution. In contrast, a phased (1D) array mainly focuses and steers in the plane, a mechanical sector relies on fixed mechanical steering with limited elevation control, and a linear (single-row) array has little to no elevational control.