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: 1/1000 millimetre to 1 millimetre
• Microwaves: 1 millimetre to 10 centimetres
• U.H.F.: 10 centimetres to 1 metre

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.