User's Manual

SD5/SD6 Ultrasonic TableTop Doppler User Manual Overall Sensitivity
- 45 -
A4.3 Overall Sensitivity of SD6 (2MHz Wireless Probe)
Diameter of
Target
Reflector
(mm)
Distance
(d)(mm)
Reflection
Loss A(d)
Two-way Attenuation
B=∑B
a
+B
w
V
S
(r.m.s)
mV
V
n
(r.m.s)
mV
(
)
( )








=
...
...
log20
10
smrV
smrV
C
n
s
dB
Overall
Sensitivity
(S=A(d)+B+C
)
dB
∑B (T: ultrasonic attenuation
phantom No. B
a
:dB)
B
w
(dB)
B
(dB)
1.58
A=45.7dB@
2MHz
50 39.8
T 6#6#6#2#
0 80.0 35.80 16.43 6.76 126.56
B
a
80.0
75 43.3
T 6#6#6#1#
0 78.3 36.47 16.04 7.13 128.73
B
a
78.3
100 45.8
T 6#6#5#4#
0 72.6 39.12 18.43 6.54 124.94
B
a
72.6
200 51.8
T 6#6#4#2#
0 65.4 42.0 19.45 6.69 123.89
B
a
65.4
2.38
A=43.2dB@
2MHz
50 37.2
T 6#6#6#2#
0 80.0 46.71 16.37 9.12 126.32
B
a
80.0
75 40.7
T 6#6#6#2#
0 80.0 41.77 17.60 7.51 128.21
B
a
80.0
100 43.2
T 6#6#6#1#
0 78.3 39.95 18.23 6.81 128.31
B
a
78.3
200 49.2
T 6#6#5#4#
0 72.6 40.84 20.54 5.97 127.77
B
a
72.6
Doppler Frequency (Hz) 218
Velocity of Target
(cm/s)
10