Which term describes a transducer comprised of multiple crystals bonded together to act as a single transducer?

• A. Crystal mosaic
• B. Focusing crystal
• C. Scrubber
• D. Single plane manipulator

Answer: (A)

When several piezoelectric crystals are bonded together to behave as one ultrasonic element, the arrangement is called a crystal mosaic. Each crystal contributes its vibration to the overall output, and by mounting them as a single bonded assembly with a common backing, their signals sum to act like one larger transducer. This increases the effective aperture, which can improve beam width control, resolution, and sensitivity across a broader area without needing one enormous crystal. It’s a practical way to tailor beam properties and coverage by combining multiple small crystals into a single functional unit. The other terms describe either focusing methods, unrelated equipment, or mechanical manipulators, not the bonded multi-crystal transducer concept.