For a linear phased array transducer the beam is steered and focused using an electrical technique called _______.

For a linear phased array transducer the beam is steered and focused using an electrical technique called _______.

• A. Focusing
• B. Phasing
• C. Steering
• D. Damping

Answer: (B)

Beam steering and focusing in a linear phased array come from adjusting the phase of the signal across the array elements. By applying specific time delays to each element, the emitted waves interfere constructively in a chosen direction and at a chosen depth, creating a steered and focused beam. This electrical control of the relative phases is what’s called phasing. Focusing and steering describe the results you achieve, but phasing is the technique that makes both possible. Damping, by contrast, deals with reducing unwanted ringing or amplitude and isn’t used to steer or focus the beam.

Beam steering and focusing in a linear phased array come from adjusting the phase of the signal across the array elements. By applying specific time delays to each element, the emitted waves interfere constructively in a chosen direction and at a chosen depth, creating a steered and focused beam. This electrical control of the relative phases is what’s called phasing. Focusing and steering describe the results you achieve, but phasing is the technique that makes both possible. Damping, by contrast, deals with reducing unwanted ringing or amplitude and isn’t used to steer or focus the beam.