If trying to seriously build a thermal camera and you're in the US, keep in mind US export laws. IANAL, but there's some nasty restrictions if the the thermal

If trying to seriously build a thermal camera and you're in the US, keep in mind US export laws. IANAL, but there's some nasty restrictions if the the thermal cam's resolution or Hz are too high. Then they become like weapons under the law and export becomes heavily restricted. FLIR almost certainly has an entire team dedicated to making sure they don't make US customs angry.