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Subject: Re: Non-contact thermometer

Date: 09/30/03 at 5:51 PM
Posted by: Ray
E-mail: rrogers@plaidheron.com
Message Posted:

In Reply to: Non-contact thermometer posted by Themba on 09/29/03 at 8:02 AM:

Hi,
Like any design project (or mathematical project) you start with what you need to do and work backwards from there.
What are you trying to measure?
What resolution?
What accuracy?
What distance?
Emissivity variation?
How many do you plan to make; if your in school it could be zero).
One you have these answers in hand you can:
Select a sensor that has sufficient sensitivity.
Select a interface circuit.
Select a processor to manipulate the readings.

I would suggest using a Thermopile from Dexter. It has a reasonable gain ( volts/degC).
Don't get too involved with the thermography, but get a little involved. It's a subject that is worth a semester of Graduate work to get the theory and then the practice is a whole different realm.
A little knowledge will probably get you by.
I am presently building a .05degC noncontacting thermometer for a control loop; but it's a setpoint system in a controlled environment so I can cut corners here and there and build exactly what is needed and no more. There are other problems with building remote cameras for buildings or even reading across several feet.

Ray


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