AVR-Chat

----- Original Message -----
From: "Kathy Quinlan" <kat-yahoo@kaqelectronics.dyndns.org>
To: <AVR-Chat@yahoogroups.com>
Sent: Wednesday, November 10, 2004 12:22
Subject: [AVR-Chat] Tempreture Messurement


>
> Hi all,
>
> I need to measure tempretures around 36C with the best
acuracy I can
> get, I would like to measure with a precision of 0.1C so I
guess I need
> acuracy or ~0.05C.
>
> I am looking at IR based units, but I can not see why a
Type K
> thermocouple can not be used and just calibrated Span is
roughly 33-46C,
> so linearisation is not such a big issue for such a small
span I THINK,
> correct me if I am wrong.
>
> Any ideas ? will Type K get me there ? or do I need to do
the IR probe ?
>
> Cost will be a factor as we are looking at 1-100K units (I
love vague
> customers)
>
> Regards,
>
> Kat.

I found this which might be helpful.  It is basically the
design of a minature weather station (college project) where
the authors go into great detail about various temp sensors.

http://eelabinstruments.com/insmain.pdf

I'd try the forward biassed diode or an IC sensor..

erikc - firewevr@airmail.net
==
On 2004-11-02, the sheeple bleated and chose thier shepherd.
What sheep don't seem to realise is that the shepherd's only
interest in them is when they can be fleeced and when they
can
be slaughtered.