Weather Banter - View Single Post - need a temperature sensor with .1 degree accuracy

Robert Baer

wrote:

Seeing all the posts, I'm not sure! if he's gonna get this fabeled
accuracy. I think this is a pretty complex (!) topic, and I better be
spending some more time reading up on calibration and such..

Calibration? Last time I calibrated my NTC thermistor I did in Ice (0
degree C) and boiling water etc. etc. It was a 10K NTC
and there was also a reference sheet with it, I remember. But nobody
tells me how Accurate I can go with this 10K NTC FENWAL thermistor I
have with me already?

Lets say I want As much accuracy as possible with a *decently low cost
solution* (200 $ ?) To top it up, I'm in India, but I think getting
electronic components is not much of a problem.

This PT100 class B appeals to me certainly.. I'll work on it.. But how
do I go about calibration? can I use distilled water Ice etc. as one
poster mentions?

I got hold of a Cole-Palmer scientfic catalog and they have this .1
Degree accuracy on their SAMA glass thermometers. cost around
90$..should I go in for this manual solution? but how about measuring
contact temperature?

Further reading this book, and as some other posters point out, it is
clear how vain a pursuit the radiation temperature measurement at this
accuracy shall be. The best models I see in this catalog give me around
2 Degree C, and they are pretty expensive..

Just curious, But I remember reading that CCDs have similar response to
IR as to light.. is this so? if so, can there be this remote
possibility that I turn a 5 Mega pixel Digital camera as a thermal
imager of sorts? maybe with appropriate "IR filters" ?

Also, Can I ever use IR diodes (like those in a TV) for any kind of
temperature measurement?
Many thanks
Suraj

I understand that digital camera constructionhas been changed to
include an IR blocking filter.
Why?
So you cannot use it to take tittie pictures thru (transparent)
tshirts....