Mount the electrodes on a pair of rulers so they can be kept parallel and moved apart gradually to keep the electrode LED at or below the intensity of the other until they get to X inches on the ruler and are equal at finish.
Start with the one LED equal in intensity to the other and take that measurement. Subtract that from a final measurement and water purity gets taken into account.
You probably wouldn't even have to sit there and diddle with it continuously.
Might be able to just place the electrodes at the start point to get the water purity measurment then set the electrodes at the desired finish point, then take a peek now and then to see if the LEDs have matched up yet...after stirring the water.
Ode
At 10:39 AM 7/6/2004 -0400, you wrote:
>>>>
An ordinary differential equation model for the<<<<
EIS generating process could be fruitful even if
it fell short of predicting the results of actual
processes with accuracy, at least in early, simplistic
attempts.
An ODE model could explain phenomena that are
generally accepted. For example, no one doubts that
the rate of electrolysis falls off with the distance
separating the electrodes. Does it fall off inversely
as the distance itself? Or, as the square of the
distance? The latter is the more likely answer (a priori)
because it preserves the symmetry of displacement
in the ODE.
As another example, no one doubts that the electolysis
process accelerates if allowed to proceed without
current control or limitation. Yet the process will
eventually limit itself by saturating, producing
oxides or floating sol. So a sigmoid (S-shaped)
signal for concentration vs. time would be expected
for the ODE model. Such a sigmoid has an
inflection point. What can it tell us? Maybe a lot.
The process of electrolysis bears a strong
resemblance to the charge carrier transport
phenomena in semiconductor devices, it we view
these processes abstractly, based on their ODEs.
Charge carrier mobility is an important and
fairly easily measured parameter. But a purely
empirical approach to electrolysis might have a
tough time finding a way to measure ion mobility.
It takes at least a simple ODE model to explain
how to find mobility. And finding charge mobilitycould have
very practical, clinical implications. It may be
tantamount to measuring charge sizes.
Thus, a Poor-Man's ultramicroscopy substitute,
perhaps.
Best regards,
Matthew
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