Pressure equation

by Ovetter — last modified Oct 21, 2006 09:49 AM
Up to General comments

Pressure equation

Posted by Ovetter at October 11. 2006
How does the aquadopp current profiler measure the pressure signal, as returned in the .wad files?
I am looking at shallow depths, comparing with other pressure sensors and need to correctly remove atmospheric pressure from the pressure time series so would like the conversion equation if possible

thanks
Oliver
Current state: Being created

Pressure equation

Posted by Ovetter at October 14. 2006
Dear Oliver

The pressure reading is uncompensated for athmospheric variations.  The ASCII file corresponds to the pressure values (and not dB) as the file heading may lead you to believe.

Best regards,

Atle Lohrmann
Current state: Being created

Pressure equation

Posted by Ovetter at October 19. 2006
thanks Atle,

actually i was wondering how the aquadopp current profiler calculates pressure.
does it use salinity and temperature to calculate a density of water, or is it using a constant for water density?
also does it assume hydrostatic pressure or is there a depth correction applied?

thanks!
Oliver
Current state: Being created

Pressure equation

Posted by Ovetter at October 21. 2006
Hi again

We measure pressure (Pa) and we normally output dBar in the ASCII files.  Only in the DW-Aquadopp do we convert to water depth, and when we do, we use the full depth dependent algortithm with variable temperature and a fixed salinity (35).

Best regards,

Atle Lohrmann
Current state: Being created
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