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Appendix B Overall Sensitivity
Overall Sensitivity (2MHz
Probe
Reflection Loss A(d)
Diameter of Target
Distance
Reflector
(d)
(mm)
(mm)
50
75
1.58
A=45.7dB@
2MHz
100
200
50
75
2.38
A=43.2dB@
2MHz
100
200
Doppler Frequency (Hz)
333
SONOTRAX Series Ultrasonic Pocket Doppler User Manual
)
Two-way Attenuation
B=∑B
∑B
a
(T:mm
B
:dB)
a
T
20
4.8
4.0
45.7
B
40
9.6
8.0
a
T
20
4.8
3.4
45.7
B
40
9.6
6.8
a
T
20
4.8
3.4
45.7
B
40
9.6
6.8
a
T
20
4.8
45.7
B
40
9.6
a
T
20
4.8
3.4
43.2
B
40
9.6
6.8
a
T
20
4.8
3.4
43.2
B
40
9.6
6.8
a
T
20
4.8
3.4
43.2
B
40
9.6
6.8
a
T
20
4.8
43.2
B
40
9.6
a
+B
a
w
V
s
B
B
w
(dB)
(dB)
-
0
57.6
-
-
0
56.4
-
-
0
56.4
-
-
-
0
49.6
-
-
2.2
0
60.8
4.4
1
0
58.4
2
-
0
56.4
-
1
-
0
51.6
2
-
Velocity of Target (cm/s)
- 28 -
=
(r.m.s.)
V
(r.m.s)
C
20
log
n
10
mV
mV
dB
186
94
5.93
175
90
5.78
174
89
5.82
173
90
5.68
178
89
6.02
170
90
5.52
165
85
5.76
160
85
5.49
12.5
(
)
Overall Sensitivity
V
r
.
m
. .
s
s
(
)
(S=A(d)+B+C)
V
r
.
m
. .
s
n
dB
109.2
107.8
107.9
100.9
110.0
107.1
105.3
100.2
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