The focusing method that uses electronic delays across array elements is called?

The focusing method that uses electronic delays across array elements is called?

• A. External focusing
• B. Lens focusing
• C. Internal focusing
• D. Phased array focusing

Answer: (D)

Using electronic delays across each element to control when the elements emit lets the waves converge at a chosen point. By applying precise time delays, the waves from all elements arrive in phase at the focal location, producing constructive interference and a strong, focused beam. This arrangement of timed excitation across the array is known as phased array focusing. It also enables electronic steering and dynamic focusing without moving the transducer, unlike methods that rely on a physical lens.

Using electronic delays across each element to control when the elements emit lets the waves converge at a chosen point. By applying precise time delays, the waves from all elements arrive in phase at the focal location, producing constructive interference and a strong, focused beam. This arrangement of timed excitation across the array is known as phased array focusing. It also enables electronic steering and dynamic focusing without moving the transducer, unlike methods that rely on a physical lens.