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Add depth to mbar helper function

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This ensures that we use consistent math to get the absolute pressure at a
certain depth.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
This commit is contained in:
Dirk Hohndel 2012-11-10 23:11:40 +01:00
parent f53788e5e4
commit e167108c76
3 changed files with 33 additions and 17 deletions
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6
divelist.c
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@ -710,7 +710,7 @@ static int calculate_otu(struct dive *dive)
int o2 = dive->cylinder[sample->cylinderindex].gasmix.o2.permille;
if (!o2)
o2 = AIR_PERMILLE;
po2 = o2 / 1000.0 * (sample->depth.mm + 10000) / 10000.0;
po2 = o2 / 1000.0 * depth_to_mbar(sample->depth.mm, dive) / 1000.0;
if (po2 >= 0.5)
otu += pow(po2 - 0.5, 0.83) * t / 30.0;
}
@ -770,8 +770,8 @@ static int calculate_sac(struct dive *dive)
}
}
}
/* Mean pressure in atm: 1 atm per 10m */
pressure = 1 + (dive->meandepth.mm / 10000.0);
/* Mean pressure in bar (SAC calculations are in bar*l/min) */
pressure = depth_to_mbar(dive->meandepth.mm, dive) / 1000.0;
sac = airuse / pressure * 60 / duration;
/* milliliters per minute.. */