If focusing is achieved by electronically controlled delays rather than physical changes, this corresponds to which focusing method?

If focusing is achieved by electronically controlled delays rather than physical changes, this corresponds to which focusing method?

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

Answer: (C)

Focusing achieved through electronically controlled delays across multiple transducer elements is phased array focusing. By applying precise time delays to each element during transmission, the emitted waves arrive in phase at a chosen focal point, creating a constructive beam that concentrates energy at that depth. This electronic control lets you adjust focus and even steer the beam without changing the transducer’s physical shape or adding external lenses. External or internal focusing rely on physical lenses or curvature to bend or shape the sound path, and dynamic focusing involves changing delays to maintain focus at different depths, but the hallmark here is using electronic timing across an array to form and steer the focus, which defines phased array focusing.

Focusing achieved through electronically controlled delays across multiple transducer elements is phased array focusing. By applying precise time delays to each element during transmission, the emitted waves arrive in phase at a chosen focal point, creating a constructive beam that concentrates energy at that depth. This electronic control lets you adjust focus and even steer the beam without changing the transducer’s physical shape or adding external lenses. External or internal focusing rely on physical lenses or curvature to bend or shape the sound path, and dynamic focusing involves changing delays to maintain focus at different depths, but the hallmark here is using electronic timing across an array to form and steer the focus, which defines phased array focusing.