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SD5/SD6 Ultrasonic TableTop Doppler User Manual
A3.3 Overall Sensitivity of SD6 (2MHz Wireless Probe)
Diameter of
Target
Distance
Reflection
Loss A(d) ∑B (T: ultrasonic attenuation
Reflector
(d)(mm)
(mm)
50
1.58
75
A=45.7dB@
2MHz
100
200
50
75
2.38
A=43.2dB@
2MHz
100
200
Doppler Frequency (Hz)
Two-way Attenuation
phantom No. B
:dB)
a
T
6#
6#
3#
45.7
B
24.9
24.9
7.7
a
T
6#
6#
2#
45.7
B
24.9
24.9
5.5
a
T
6#
6#
1#
45.7
B
24.9
24.9
3.7
a
T
6#
6#
-
45.7
B
24.9
24.9
-
a
T
6#
6#
3#
43.2
B
24.9
24.9
7.7
a
T
6#
6#
3#
43.2
B
24.9
24.9
7.7
a
T
6#
6#
2#
43.2
B
24.9
24.9
5.5
a
T
6#
6#
1#
43.2
B
24.9
24.9
3.7
a
333
B=∑B
+B
a
w
B
B
w
(dB)
(dB)
-
0
57.5
-
-
0
55.3
-
-
0
53.5
-
-
0
49.8
-
-
0
57.5
-
-
0
57.5
-
-
0
55.3
-
-
0
53.5
-
- 39 -
⎛
=
⎜ ⎜
V
(r.m.s)
V
(r.m.s)
C
20
log
S
n
10
⎝
mV
mV
dB
168.6
84.32
6.02
164.2
83.88
5.83
165.6
84.58
5.84
167.0
84.34
5.93
168.8
84.56
6.00
166.1
84.14
5.91
164.2
83.90
5.83
162.9
84.06
5.75
Velocity of Target
(cm/s)
Overall Sensitivity
(
)
⎞
Overall Sensitivity
V
r
.
m
. .
s
⎟ ⎟
s
(
)
.
. .
⎠
V
r
m
s
(S=A(d)+B+C)
n
dB
109.2
106.8
105.0
101.4
106.7
106.6
104.3
102.5
12.5
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