Service manual

Calibration
10 P2260/E
1550
SOUND SPEED IN SEA WATER
Simrad sept. 1992
Mackenzie (1981) J.acoust.Soc.Am., 70,807-12.
Del Grosso (1972) J.acoust.Soc.Am., 52,1442-6.
at depth 0 m
1500
1450
1400
0510
WATER TEMPERATURE (deg. C)
15 20 25 30
m/s
Salinity 40
Salinity 0
(
CD467
)
Figure 3 Sound speed in water.
from FRANCOIS & GARRISON
JASA dec. 1982
10 Degrees C
200 m depth
pH = 8
FREQUENCY (kHz)
SO
UND AB
SO
RPTI
O
N (dB
/
km)
0
(CD468)
0
10
20
30
40
50
60
25 50 75 100 125 150 175 200
SIMRAD sept. 1990
35% SALINITY
30
25
20
15
10
5
0
Figure 4 Sound absorption.