[AR] Re: Semiconductor cryo level sensing
- From: Derek Lyons <fairwater@xxxxxxxxx>
- To: arocket@xxxxxxxxxxxxx
- Date: Mon, 14 Sep 2015 21:50:07 -0700
On Mon, Sep 14, 2015 at 2:14 PM, Ben Brockert <wikkit@xxxxxxxxx> wrote:
But I think my concept would put less heat into the tank and has digital
outputs, rather than analog.
No, it looks like a digital output (because the individual sensor
states are binary) but it's actually discrete output. Nor can you
simply use the discretes directly as a digital word, because the
relationship between adjacent individual bits in a digital word is
exponential while the relationship between adjacent sensors in a
cylindrical tank is linear and proportional to the distance between
them. You *could* position the sensors so the linear and proportional
outputs equate to the exponential positions of your digital word...
but such an arrangement would be hopelessly coarse over most of the
burn. The conversion isn't necessarily of any great complexity, but
it is something you'll have to account for.
Nor does it escape the need for fine manufacturing and assembly
tolerances as the accuracy of your gauging system is (as it always is)
directly proportional to the accuracy of manufacturing and assembly.
D.
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