In linear phased array transducers, what determines the sound beams direction and focus?

In linear phased array transducers, what determines the sound beams direction and focus?

• A. The array length
• B. The temperature of the transducer
• C. The overall pattern
• D. The coupling medium

Answer: (C)

Beam direction and focus come from the interference pattern created by how the array is excited. In a linear phased array, you apply precise time delays (and amplitudes) to each element so the waves combine constructively at a chosen angle and depth. That sculpted interference pattern—the overall pattern—determines where the main lobe points and where the focus sits. The physical length, temperature, and coupling can influence the details of the pattern in practice, but the direction and focal point are set by the excitation pattern itself.

Beam direction and focus come from the interference pattern created by how the array is excited. In a linear phased array, you apply precise time delays (and amplitudes) to each element so the waves combine constructively at a chosen angle and depth. That sculpted interference pattern—the overall pattern—determines where the main lobe points and where the focus sits. The physical length, temperature, and coupling can influence the details of the pattern in practice, but the direction and focal point are set by the excitation pattern itself.