Thermopile Detector Voltage Amplification Module

Jun 03, 2008 2 Replies
A

I am working with a thermopile detector from Dexter Now the problem I am having is that the output of the detector is in th range of microvolts and it needs to be amplified to 3.3V I am using 4 tlc2652 opamps (in first stage) and an opa4277 quad opamp i the second stage. The opamps are in noninverting mode. Capacitors are als attached for filteration.



Now I am having a lot of trouble with the circuit and therefore I wa looking for an of the shelf amplification and filteration module offerin amplification from microvolts to round about 5V. Are there an manufacturers developing such modules for sensors.


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R

That won't help much if applied improperly. You need an amplifier with extremely low offset, sometimes they atre called zero-drift OpAmp. Such as the LT2053, an RRIO. It can do this in one step basically. The layout is critical.

Rene

Ing.Buero R.Tschaggelar - http://www.ibrtses.com & commercial newsgroups - http://www.talkto.net
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C

Look at the circuit in Electronic Engineering Times, 2008-06-08, p33. It can handle DC with low offset, or easily be altered for a high pass filter. The offset adjustment doesn't affect the gain, which depends on one resistor. The remaining 6 resistors are identical, and require matching.

[mail]: Chuck F (cbfalconer at maineline dot net) [page]: Try the download section.
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