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Date: Sat, 16 Nov 2002 09:55:35 -0500
From: "Raymond E. Rogers"
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Subject: Re: Temperature Measurement Stability - +/-3.5 microdegrees
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> I have to ask, what on earth requires that level of accuracy.
> I am an engineer, not a scientist.
I don't know if the question was directed at me but....
Consider medical testing, the chemical processes are tuned to 37degC.
In actual measurements the sensitivity of diagnostic reaction rate to
temperature is 1%/.15degC . We are attempting to bring to in office
diagnostics a series of general health tests for veterinary clinics at
the price range of $3.00 per test with an accuracy of around 4%. I am
trying to move the electronics control system completely out of the way
of the measurement; believe me there are a lot of other items that
contribute to the measurement uncertainty. I want to be able to say
with certainty that the temperature is stable. In fact there is a case
of cascading specs here: 4:1 for the chemistry and then 5:1 for the
electronic instruments, but I really think (in this day and age) that
the electronics should not be the limiting factor.
In the end I hope to see the technology move from the veterinary office
to the doctor's office and help bring down the cost of medicine. It
will probably happen by 2020, the question is who is going to do it.
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