Z sensor schematic

I've decided to build a UAV from scratch using thermopiles to determine attitude.  I already have an xy sensor from FMA, but I don't have a z sensor.  I do have two thermopiles to use.  I'd rather not calibrate every time I want to fly or risk weather change affecting the sensors.  I've been looking everywhere for a schematic to build a z sensor.  Does anyone know where I can find one or have a copy of the schematic I can use?

Much appreciated,
Strix

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