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Correct partial pressure calculations

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Regardless what the dive computer tells us, don't believe that pO2 was
higher than the ambient pressure. This gives much more realistic values.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2012-12-08 21:14:00 -08:00
parent 02844c3a10
commit 07b74007f1
1 changed files with 4 additions and 2 deletions
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6
profile.c
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@ -1879,9 +1879,11 @@ static struct plot_info *create_plot_info(struct dive *dive, struct divecomputer
/* we have an O2 partial pressure in the sample - so this
* is likely a CC dive... use that instead of the value
* from the cylinder info */
double po2 = entry->po2 > amb_pressure ? amb_pressure : entry->po2;
double ratio = (double)fhe / (1000.0 - fo2);
entry->phe = (amb_pressure - entry->po2) * ratio;
entry->pn2 = amb_pressure - entry->po2 - entry->phe;
entry->phe = (amb_pressure - po2) * ratio;
entry->pn2 = amb_pressure - po2 - entry->phe;
entry->po2 = po2;
} else {
entry->po2 = fo2 / 1000.0 * amb_pressure;
entry->phe = fhe / 1000.0 * amb_pressure;