Annular phased array transducers use ______ steering.

Annular phased array transducers use ______ steering.

• A. Electronic
• B. Mechanical
• C. Hydraulic
• D. Magnetic

Answer: (B)

Annular transducers have concentric ring elements. Steering the beam across the image is achieved by mechanically moving the transducer or rotating the ring stack to change the beam’s direction. While you can electronically focus along the depth by applying delays to the rings, the circular symmetry makes broad electronic steering inefficient, so mechanical scanning is used to steer the beam.

Annular transducers have concentric ring elements. Steering the beam across the image is achieved by mechanically moving the transducer or rotating the ring stack to change the beam’s direction. While you can electronically focus along the depth by applying delays to the rings, the circular symmetry makes broad electronic steering inefficient, so mechanical scanning is used to steer the beam.