What if the "sniffer electronics" where to read from samplings.
Working something like this:
Direct the gas through a smaller tube to blow by the "sniffers".
This way, through simple valves or switch-block, (if made simple and thus "safe") you could sample from different areas, Ex.:
- Plenum (after absorbent, as now)
- Exhale Counter-Lung (diver CO2 production)
- Inhale hose (after Diluent entry)
a) Thin tube to point just prior to mouthpiece?
b) Through a hydrophobic membrane, from within the mouthpiece?
- Outside surface air (needs a self-closing seal, pull and hold to keep open)
- Outside with a small chamber (balloon?) for gas testing.
The system could default to Plenum or Inhale hose.
This gives the option for the system to check various areas for safe status.
I understand that there might be issues if the gasses are not sufficiently blended when the samples are being taken. Hence the reason of generally choosing to inject O2 early in the loop to ensure a good blend through the scrubber, before testing the ppO2.
If from all valves inducing gasses into this blend, the gas was send by a twirling tube or towards a whirled cone, a venturi effect would be created that might assist in these gasses blending.
The dream of having a computer know and calculate on the gasses the diver is actually breathing.
Idear on (ambient pressure) Valve/switch-block:
Make it a low cylinder shape with periferal connections to sampling points (starshape).
Have the sampling taken through center top or bottom.
Selecting the sampling from a revolving inner valve.
Smallest possible common area.
OK now! Go to work and make this thing happen!
