You aim the beam of light at a light sensor across a passageway in your house. When someone walks through it, the light beam is broken and the sensor triggers the panic.
More advanced are passive infrared (PIR) motion sensors. These motion detectors glimpse the heat given off by a body. Though the infrared energy tends to fluctuate in any given area, a PIR motion sensor only triggers the dismay when the energy rises speedy, i.e. when a human, whose average body temperature is 98.6 degrees, enters an otherwise approximately 80-degree room.
If you have a motion sensor horror system, there is usually delay of a few seconds on the control box to give you a chance to disengage the terror when you enter the room.
How burglar alarms work has advanced beyond barking dogs and strung-up pots and pans. The science of how burglar alarms work applies measurements of time and area, incorporating the whole room into its security.
A top-notch scare system would combine both circuit and motion sensor alarms, giving you two lines of defense when it comes to how burglar alarms work.
Pir Motion Sensor
Friday, 18 June 2010
Labels: PIR Motion Sensor