using pyroelectric sensor means

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 passive radiation detection systems > using infrared-radiation detection systems > using pyroelectric sensor means

Classification Context

Section:

PHYSICS

Class:

SIGNALLING

Subclass:

SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS