The Microbolometer is made from either Vanadium Oxide (VOx) or Amorphous silicon (a-Si)layer that has a wide temperature range coefficient.
The differences in scene temperature are converted into electrical signals which are processed into an image.
A bolometer is a small plate that floats above the surface of a Read Out Integrated Circuit (ROIC). The temperature of the plate changes when a photon falls on it. The differences in temperature on the microbolometer effect the electrical resistance of the layer and build up a “scene”.