by interference of a radiation field

Introduced: January 1990

Last revised: January 2006

Full Title

Burglar, theft or intruder alarms > Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength > using active radiation detection systems > by interference of a radiation field

Classification Context

Section:: PHYSICS
Class:: SIGNALLING
Subclass:: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS