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<div class="moz-cite-prefix">On 06/11/2014 11:33, Robert Helling
wrote:<br>
</div>
<blockquote
cite="mid:5E48F8B0-26CC-4909-9DD1-31A76B66C720@atdotde.de"
type="cite">
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<div style="color: rgb(0, 0, 0); font-family: Menlo;
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<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
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-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">after getting a good night of sleep,
I am reading this again (several times indeed) and I am
not sure I understand what you are trying to tell me.</div>
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</blockquote>
Let me see if I can improve. It was late in the evening for me as
well.<br>
<br>
<blockquote
cite="mid:5E48F8B0-26CC-4909-9DD1-31A76B66C720@atdotde.de"
type="cite">
<div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); font-family: Menlo; font-style:
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0px; word-wrap: break-word; -webkit-nbsp-mode: space;
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<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">I understand that for a CCR segment
there are two cylinders in use simultaneously, diluent and
O2. For the deco calculation to work, it has to know that
the diluent is (and figure the actual breathing gas from
that and ambient pressure and set point). <br>
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</blockquote>
Correct<br>
<blockquote
cite="mid:5E48F8B0-26CC-4909-9DD1-31A76B66C720@atdotde.de"
type="cite">
<div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); font-family: Menlo; font-style:
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0px; word-wrap: break-word; -webkit-nbsp-mode: space;
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<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
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-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; "><br>
</div>
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">The other question is what to plot as
a pressure (as in cylinder pressure, not partial pressure)
graph. Ideally both, but at the moment we don’t do that.
So, at least for the .txt import it seems we are plotting
diluent pressure. Is that what you are complaining about?</div>
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</blockquote>
I was not intending to complain at all :-) . No, we plot the
Oxygen cylinder pressure because that is the default cylinder
(cylinderindex =0) that is plotted by Subsurface, as is done for all
OC dives that do not have cylinder changes. The diluent cylinder
pressure still needs to be added.<br>
<blockquote
cite="mid:5E48F8B0-26CC-4909-9DD1-31A76B66C720@atdotde.de"
type="cite">
<div apple-content-edited="true">
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after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; "><br>
</div>
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">MY question is: Where does this
information (and also the information about the O2
cylinder pressure) as a function of time come from? </div>
</div>
</div>
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</blockquote>
These are pressure reading taken directly by the Poseidon computer.
In the xml contains samples with attributes of pdiluent and of
pressure. Look, you will find them in the xml. The attributes are a
bit sparse compared to the other attribute assignments, perhaps
recorded at pressure drops of roughly around 8 bar. Remember the
ball park pressure drop is around 40 bar per dive.<br>
<blockquote
cite="mid:5E48F8B0-26CC-4909-9DD1-31A76B66C720@atdotde.de"
type="cite">
<div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); font-family: Menlo; font-style:
normal; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal; orphans: 2;
text-align: -webkit-auto; text-indent: 0px; text-transform:
none; white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-size-adjust: auto; -webkit-text-stroke-width:
0px; word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">Is that in the .txt/.csv as as far as
I can see, it is not in the .xml. </div>
</div>
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</div>
</blockquote>
<br>
See above.<br>
<blockquote
cite="mid:5E48F8B0-26CC-4909-9DD1-31A76B66C720@atdotde.de"
type="cite">
<div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); font-family: Menlo; font-style:
normal; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal; orphans: 2;
text-align: -webkit-auto; text-indent: 0px; text-transform:
none; white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-size-adjust: auto; -webkit-text-stroke-width:
0px; word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">Or do we only have start and and
pressures for the cylinders (again they seem to be missing
for the xml and I don’t know about the others). In that
case, for OC, cylinder pressures to be plotted get
interpolated assuming a constant SAC. But for CCR that (as
was discussed at length before) does not make sense. For
O2 one might try a depth independent consumption (leading
to a linear plot of O2 cylinder pressure) but for diluent
it is ascent/descent dependent in a complicated way that
we have not yet figured out how to model, so at the
moment, any interpolation would be bogus.</div>
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; "><br>
</div>
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">So, what to you expect to see and
what are you seeing instead?</div>
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; "><br>
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</blockquote>
At the moment a graph of the O2 cylinder pressure, based on the info
below.<br>
I hope that Tomaz will be able to add a second graph of diluent
cylinder pressures.<br>
<blockquote
cite="mid:5E48F8B0-26CC-4909-9DD1-31A76B66C720@atdotde.de"
type="cite">
<div apple-content-edited="true">
<div style="color: rgb(0, 0, 0); font-family: Menlo; font-style:
normal; font-variant: normal; font-weight: normal;
letter-spacing: normal; line-height: normal; orphans: 2;
text-align: -webkit-auto; text-indent: 0px; text-transform:
none; white-space: normal; widows: 2; word-spacing: 0px;
-webkit-text-size-adjust: auto; -webkit-text-stroke-width:
0px; word-wrap: break-word; -webkit-nbsp-mode: space;
-webkit-line-break: after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">Best</div>
<div style="color: rgb(0, 0, 0); font-family: Menlo;
font-style: normal; font-variant: normal; font-weight:
normal; letter-spacing: normal; line-height: normal;
orphans: 2; text-align: -webkit-auto; text-indent: 0px;
text-transform: none; white-space: normal; widows: 2;
word-spacing: 0px; -webkit-text-size-adjust: auto;
-webkit-text-stroke-width: 0px; word-wrap: break-word;
-webkit-nbsp-mode: space; -webkit-line-break:
after-white-space; ">Robert</div>
</div>
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</blockquote>
<sample time="05:08" depth="10.0 m" pressure="176.0 bar"/><br>
<sample time="12:19" depth="16.5 m" pressure="171.0 bar"/><br>
<sample time="22:30" depth="34.0 m" pressure="167.0 bar"/><br>
<sample time="32:03" depth="26.0 m" pressure="161.0 bar"/><br>
<sample time="45:21" depth="18.5 m" pressure="151.0 bar"/><br>
<sample time="46:10" depth="18.0 m" pressure="150.0 bar"/><br>
<sample time="57:14" depth="00.0 m" pressure="143.0 bar"/><br>
<sample time="59:43" depth="00.0 m" pressure="141.0 bar"/><br>
<br>
<sample time="03:36" depth="09.5 m" pdiluent="172.0 bar"/><br>
<sample time="06:45" depth="13.5 m" pdiluent="168.0 bar"/><br>
<sample time="11:20" depth="19.5 m" pdiluent="164.0 bar"/><br>
<sample time="13:14" depth="18.5 m" pdiluent="163.0 bar"/><br>
<sample time="19:31" depth="33.5 m" pdiluent="151.0 bar"/><br>
<sample time="20:11" depth="34.5 m" pdiluent="151.0 bar"/><br>
<sample time="36:15" depth="28.0 m" pdiluent="145.0 bar"/><br>
<br>
The start pressures are in the .txt control file.and in the notes
node of the xml.<br>
The end pressures are calculated by Subsurface by interpolation.<br>
<br>
<pre>With Poseidon CCR dives, cylinder 0 is assumed to be the oxygen cylinder and cylinder 1 is
assumed to hold the diluent gas. If baleout takes place, it would be to
cylinder 2 and onwards. The oxygen pressures (mbar) are found in
plot_data.pressure[2], defined in profile.h. pressure[0] has the raw
sensor pressure data while pressure[1] contains the interpolated values
between measured data points. Similarly, the pressure of the diluent gas
is held in plot_data.diluentpressure[2] (raw measurements in
diluentpressure[0] and interpolations in diluentpressure[1].
The debug function that I referred to yesterday prints all the calculated values
of pressure to a file. I attach the pressures debug output for the current dive. It is in
a format that I can easily access with R.
Is this a bit better, I hope??
Kind regards,
willem
</pre>
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