[AR] Re: Semiconductor cryo level sensing
- From: Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Tue, 15 Sep 2015 09:23:46 +0200
Am 14.09.2015 um 23:39 schrieb Pierce Nichols:
However, the current through a diode is also temperature dependent,
which points the way to a more elegant implementation. Perhaps you could
just have a line of plain diodes and sense the change in current through
each one as the liquid level passes it. Thoughts?
Wouldn't it be much simpler to just have that capacitive uptake in the
tank? ( and a spot o electronics that converts this to a usefull
signal?) additional advantage is that it produces a continuous ( time
resolution) signal. Though you need a fluid with reasonably large εr !
for water I've seen cheap sensors that unload a charge into a
wire that stretches along the possible water levels.
( Piece of plastic pipe with a wire along the center. used at the
neighboring institute in humungously large numbers for water table
research )
energy uptake along the ( preferably high temp coefficient) wire for
each discharge is constant.
fluid imersed parts show much less temp change from that than
the parts in the "gas head" ;-) measuring the change in resistance
indicates the immersed length.
uwe
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