API QUPA Practice Questions - API QUPA Qualified Ultrasonic Phased Array Examiner Exam

What happens to PAUT beam focusing capability beyond the natural near-field length of the active aperture?

Focusing becomes sharper Focusing is not possible — the beam naturally diverges The beam automatically refocuses at 2N The beam reverses direction

Correct Answer:

Focusing is not possible — the beam naturally diverges

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