Which of the following is not a beam steering technique for a mechanical scan head?

• A. Oscillating Disc
• B. Phased Beam
• C. Rotating Wheel
• D. Oscillating Mirror

Answer: (B)

Beam steering with a mechanical scan head relies on moving parts to sweep the beam across the region of interest. An oscillating disc, a rotating wheel, or an oscillating mirror all achieve this by physically deflecting or reorienting the beam path. Phased beam, on the other hand, steers the beam electronically by applying precise delays to the signals of individual elements in an array, so no moving parts are required. Therefore, phased beam is not a mechanical beam steering technique.