Archive for the ‘sensors’ Category

Multi detection methods meet different applications

Wednesday, July 18th, 2012

Passive Infrared (PIR):

Senses occupancy by detecting the difference between the heat emitted from the human body in motion and the background space. Best for use in areas with (1) an unobstructed view, (2) high air flow, and (3) ceiling mounts.

Ultrasonic:

Detects motion by bouncing ultrasonic waves off of objects and analyzing the frequency shift between the emitted and reflected sound waves. Best for use in areas with (1) low air flow, (2) partitions and dividers, and (3) high levels of minor activity (e.g., an office space).

Microwave:

Detects motion by bouncing ultra-high frequency electromagnetic waves off of objects and calculating the frequency shift between the emitted and reflected waves. Best for use behind a fixture lens because it can detect motion through dense non-metallic materials.

Dual Tech:

Uses both passive infrared and ultrasonic detection methods in order to maximize reliability and minimize “FALSE ON”. Best overall performance for most applications.