Sofar technology: Difference between revisions

Latest revision as of 15:09, 20 February 2012

SOFAR technology

(Acronym for Sound Fixing and Ranging technology.) Technology developed during World War II when it was discovered that there was a "channel" in the deep ocean within which the acoustic energy from a small explosive charge (deployed in the water by a downed aviator, for example) could transmit over long distances.

An array of hydrophones could be used to range on and roughly locate the source of the charge thereby allowing rescue of downed pilots far out to sea. This "channeling" of sound occurs because there is a minimum in the vertical sound speed profile in the ocean caused by changes in the density of the water column. The density is affected by water temperature, pressure (depth), and salinity. Changes in the speed of sound in the water are largely due to changes in temperature and pressure, with salinity offering only a minor effect.
See also RAFOS technology.

INDEX
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Z
0
1
2
3
4
5
6
7
8
9

@@ Line 9: / Line 9: @@
    </div>
-<div class="definition"><div class="short_definition">(Acronym for Sound Fixing and Ranging technology.) Technology developed  during World War II when it was discovered that there was a &ldquo;channel&rdquo; in the deep ocean within  which the acoustic energy from a small explosive charge (deployed in the water by a downed aviator,  for example) could transmit over long distances.</div><br/> <div class="paragraph">An array of hydrophones could be used to range on and roughly locate the source of the charge  thereby allowing rescue of downed pilots far out to sea. This &ldquo;channeling&rdquo; of [[sound]] occurs because  there is a minimum in the vertical sound speed [[profile]] in the ocean caused by changes in the  [[density]] of the water column. The density is affected by water [[temperature]], [[pressure]] (depth),  and [[salinity]]. Changes in the [[speed of sound]] in the water are largely due to changes in temperature  and pressure, with salinity offering only a minor effect. <br/>''See also'' [[RAFOS technology]].</div><br/> </div>
+<div class="definition"><div class="short_definition">(Acronym for Sound Fixing and Ranging technology.) Technology developed  during World War II when it was discovered that there was a "channel" in the deep ocean within  which the acoustic energy from a small explosive charge (deployed in the water by a downed aviator,  for example) could transmit over long distances.</div><br/> <div class="paragraph">An array of hydrophones could be used to range on and roughly locate the source of the charge  thereby allowing rescue of downed pilots far out to sea. This "channeling" of [[sound]] occurs because  there is a minimum in the vertical sound speed [[profile]] in the ocean caused by changes in the  [[density]] of the water column. The density is affected by water [[temperature]], [[pressure]] (depth),  and [[salinity]]. Changes in the [[speed of sound]] in the water are largely due to changes in temperature  and pressure, with salinity offering only a minor effect. <br/>''See also'' [[RAFOS technology]].</div><br/> </div>
 </div>