[AR] Re: Cryo-Valves (and other related questions)
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Sat, 25 Aug 2018 20:17:48 -0400 (EDT)
On Sat, 25 Aug 2018, Brett Coles wrote:
Also, is there a way we can measure the fill level in the LOX tank? The
best idea I have so far is just to put a whole bunch of Thermocouples on
the side and watch the cold climb up the tank as it chills in.
A variation on this is to use resistive sensors, and put enough current
through them to cause significant self-heating (either steady state or in
an occasional pulse) -- liquid cools them much better than gas does.
Obviously this works best if the sensors are inside the tank, but it can
improve sensitivity even on the outside.
You can do capacitance sensing, measuring the capacitance between (say) a
pipe and an electrode running up its center. Doing this with LOX is a bit
of a hassle because its dielectric constant is a function of density, i.e.
it changes with liquid temperature.
Henry
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