In thermal imager vs IR spectroscopy, they both look at the IR radiation of an object. What is the difference between the two.. I know IR spectroscopy look at the dipole moments of molecules. But in thermal imager.. do they also image the dipole moments of molecules? Also why you see images in the IR range of the thermal imager while you don't see any images in the IR spectroscopy? Could IR frequencies be involved such that if you reverse the two, you can see images in IR spectroscopy and see dipole moments in thermal scope? Thank you.