Ultrasound transducer for multiple focusing and method for manufacture ...

^{(^1 MULTI FOCAL POINT DESIGN-40mm IN CENTER 4mm, • IW CONTINUALLY VARIATION OUT TO 7mm AND FIXED 140mm BEYOND

—I ! 1

0.8
0.7

0.6
0.5

0.4

02

0.2-
0.1 -
0

T

T

0

8

10 12 14 16

18

FIG.

SCALE CROSS-SECTION OF ELEVATION STEERED ARRAY

8 i 1 r

2

mm 0

-2

-4
-6

FIG. 12

-8

8

A PRESSURE IMPULSE RESPONSE AT THICK AND THIN Xl0« ENDS OF ELEVATION

FIG.I3 PRESSURE OUTPUT FROM THIN HAND THICK (-) ENDS x|04 FOR 2 MHz.80% BW EXCITATION

F*|fn 14 PRESSURE OUTPUT FROM THIN(-)AND THICK(—) ENDS
I IVJ.I^* ... F0R 4 MHz> 40% BW EXCITATION

4.51
4

3.5

31 2.5

PRESSUREtPa) 2

1.5

0.5

2 3 4 5
FREQUENCY (MHz)

10 20 30 40 50 60 70 80 90 100

y AXIS (mm)