Which technology enables adjustable focusing by altering the timing among array elements?

Which technology enables adjustable focusing by altering the timing among array elements?

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

Answer: (B)

Adjustable focusing is achieved by electronically delaying the drive signals to the individual elements so the emitted waves arrive in phase at a chosen focal point. When these delays are implemented inside the transducer itself, the method is called internal focusing. This electronic shaping of the wavefront allows you to move the focus to different depths (and even steer the beam) simply by changing the timing, without changing the hardware. External focusing would use a lens outside the array, and mechanical focusing relies on the physical shape of the element, both of which are less flexible than adjusting timing within the array.

Adjustable focusing is achieved by electronically delaying the drive signals to the individual elements so the emitted waves arrive in phase at a chosen focal point. When these delays are implemented inside the transducer itself, the method is called internal focusing. This electronic shaping of the wavefront allows you to move the focus to different depths (and even steer the beam) simply by changing the timing, without changing the hardware. External focusing would use a lens outside the array, and mechanical focusing relies on the physical shape of the element, both of which are less flexible than adjusting timing within the array.