A method of measuring surface temperature by using luminescent materials: the two main types are contact thermography and projection thermography.

1. A photocopying process in which the original copy is placed in contact with a transparent sheet and is exposed to infrared rays; heat from carbon or a metallic compound in the text ink then causes a chemical change in a substance laminated between the transparent sheet of paper and a white waxy back.

2. Photography that uses radiation in the long-wavelength far-infrared region, emitted by objects at temperatures ranging from -170°F (-112°C) to over 300°F (149°C). Also known as thermal photography.

A medical imaging technique based on detection of heat emitted by the body.