IMPACT SUBSEA
INNOVATIVE UNDERWATER PRODUCTS
www.impactsubsea.com
Document No:
0000.1913 |
Version No:
1.2 | 23
rd
April 2020
17
In conjunction with the reading window, which shows the reading the ISFMD system has used
for range measurement, all other detected echoes can be viewed in the display to the left:
Echo Detected at Member Diameter
On the above display, the area where a return is expected to be received if a member is flooded
is highlighted in
blue
. If a return is received in this area the member is considered flooded:
The blue window e/- 10% of the member diameter to account for variations in speed of
sound through the member wall and internal medium*.
As with any acoustic based FMD system, when an acoustic pulse is transmitted into a flooded
member, it is usual to detect an acoustic return from the back wall.
There may be other echoes however, from any item suspended in the water or from multi-path
effects.
The above window allows the operator to see each acoustic echo the ISA500 probe has
detected. The x-axis represents range (in meters) with the y-axis representing power level of
each echo.
This window is provided to create a clear view of the acoustic environment within the flooded
member.
*Note – the blue window is only in seaView versions 1.9.1 and above.
