Detection of IR radiation from hair dryer and/or special IR source.
What it Shows:
Detection of infra-red radiation by the rotation of a paddle-wheel vane inside a low pressure flask.
How it Works:
A radiometer consists of a partially evacuated flask containing a four bladed vane (see figure 1). One side of each blade is a matt black, the other silver. The black surface, being a better absorber and radiator of heat, warms the air above its surface more than the silver. The resulting higher kinetic energy of these air...
Read more about Radiometer