Glossary of Physical Terms used in the Poems
Microwave Detectors: Infrared and U.H.F (Ultra High Frequency) refer to specific wavelength ranges of the electromagnetic spectrum of which the visible spectrum is also a part. The range of wavelengths spanned by these waves are approximately:
Infrared is typically felt as radiant heat, e.g. from a 'red-hot' source.
Microwaves are used in ovens and in television signals to satellite dishes.
U.H.F. is used for transmitting television signals to an ordinary aerial.
- Infrared: 1/1000 millimetre to 1 millimetre
- Microwaves: 1 millimetre to 10 centimetres
- U.H.F.: 10 centimetres to 1 metre