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Transducer chart

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Transducer	Operates by:	Is it steered? How?	Is it focused? How?	Image shape	Electronic or Mechanical?
Linear sequenced array	sequencing	no	no – fixed focus	rectangle	Electronic
Curved sequenced array	sequencing	yes – transducer shape/element arrangement	no – fixed focus	“blunted” sector	Electronic
Phased linear array	sequencing	no	yes – phasing	rectangle	Electronic
Phased curved array	sequencing	yes – transducer shape/element arrangement	yes – phasing	“blunted” sector	Electronic
Vector	sequencing	yes – phasing	yes – phasing	“flat top” sector	Electronic
Linear phased array	phasing	yes – phasing	yes – phasing	“pointed” sector	Electronic
Annular array	phasing	yes – mechanically	yes – phasing	“notch” sector	Electronic (with a mechanical reflector for steering)
Oscillating Element	mechanical means	yes – element movement	no – fixed focus	notch sector	Mechanical
Rotating group of elements	mechanical means	yes – element movement	no – fixed focus	notch sector	Mechanical
Oscillating reflector	mechanical means	yes – reflector movement	no – fixed focus	notch sector	Mechanical
Linearly translating element	mechanical means	no	no – fixed focus	rectangle	Mechanical