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Right approach to calculate Temperature from voltage and resistor for thermopile

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radhika:
Hi all, I am working on contactless thermometer using TSP434 thermopile detector. I didn't found much data on datasheet. But, when I tested, I got 0.01uV as output V from pin 1 and I used LTC1050CNB Opamp to amplify it.

I am using PIC16F microcontroller to get the temperature display on datasheet. Though, I just tested the voltage variation on room temperature only. I am unable to get temperature, because I don't know the right formula for it. I have followed this tutorial https://www.instructables.com/id/Thermopile-Sensor/ but I am not sure about my reading. I got this

thermopile value = 0.00
thermistor value = 862.00
ambient temp = 88.12
object temp = 117.96

thermopile value = 0.00
thermistor value = 861.00
ambient temp = 101.40
object temp = 140.48

thermopile value = 0.00
thermistor value = 861.00
ambient temp = 101.40
object temp = 140.48

thermopile value = 0.00
thermistor value = 861.00
ambient temp = 101.40
object temp = 140.48

from the code by using arduino added on the link. Do you have any idea, how do I get right formula for thermopile TPS434? Thanks

bjbb:
web.sensor-ic.com:8000/ANFANG/TPS334_R3.pdf

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