transducers for test 1

Question 1

Mechanical

Answer 1

1 crystal

sector shape

entire image lost

focusing-fixed lens

steering-mechanical

Question 2

Linear-sequential (switched)

Answer 2

120-250 crystals

rectangle shaped

drop out of image- |

focusing-electronic: curved elements and external lens

steering-electronic: phasing

Question 3

Linear-phased array

Answer 3

200 crystals

sector shaped

poor steering and focusing

focusing-electronic: curved elements and external lens

steering-electronic: phasing

Question 4

Convex-sequential (switched)

Answer 4

over 200 crystals

blunted sector shape

drop out of image- |

focusing-electronic: curved elements and external lens

steering-electronic: phasing

Question 5

vector

Answer 5

200 crystals

flat top sector (trapezoid)

poor steering and focusing

focusing-electronic: curved elements and external lens

steering- electronic: phasing

Question 6

3D/4D

Answer 6

over 200 crystals

rectangle shape/checkerboard shape

drop out of image- |

focusing-electronic: both in lateral and thickness

steering-electronic: phasing

Question 7

Annular phased

Answer 7

5 crystals-in concentric rings

sector shape

horizontal drop out of image- –

focusing-electronic: multiple zones

steering-mechanical: motor physically moves the ringed element array