Page
108
of
133
Version 3.0 Rev r000
Date 25-08-2010
Part No. 96000001
The below table and charts illustrate how frequency, water temperature, and salinity affect
absorption
Seawater Absorption Values: Salinity = 35ppt, pH=8
2
dB/km
400kHz
200kHz
Temp
(C) 5° 10° 15°
20°
25°
5°
10°
15°
20° 25°
Depth (m)
50
97 100 111 130 154
46
56
68
80 89
100
96 100 110 128 153
46
55
67
79 88
150
96 99
110 128 152
46
55
66
78 88
200
95 99
109 127 151
45
55
66
78 87
250
95 98
109 126 150
45
54
66
77 86
300
95 98
108 125 149
45
54
65
77 86
400m
44
53
64
76 84
Mean
Value
96
99
110 127 152
45
55 66 78 87
Freshwater Absorption Values: Salinity = 0.5ppt, pH=7
dB/km
400kHz
200kHz
Temp
(C) 5° 10° 15°
20°
25°
5°
10°
15°
20° 25°
Depth (m)
50
65 55 46
39
33
17
14
12
10 9
100
65 54 46
38
33
17
14
12
10 9
150
65 54 45
38
33
17
14
12
10 9
200
65 54 45
38
32
17
14
12
10 9
250
65 54 45
38
32
16
14
12
10 9
300
64 54 45
38
32
16
14
12
10 9
Mean
Value
65 54 45 38 33
17
14 12 10 9
Table 10: Absorption Values for Seawater and Freshwater at 400 kHz and 200 kHz
2
Equation used for computation is from: Ainslie M.A., McColm J.G., “A simplified formula for viscous and
chemical absorption in sea water”, Journal of the Acoustic Society of America, 103(3), 1671-1672 as employed
on the NPL website, op cit.
Содержание 2022
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Страница 133: ...Page 133 of 133 Version 3 0 REV r000 Date 25 08 2010 Figure 102 R2Sonic Deck lead minimum connector passage dimensions ...