Chris Bent
Electronic sensor that measures infrared (IR) light Do not detect motion; detect changes in temperature Emits nothing; it’s “passive” ◦ Responds infrared energy radiated by the object
Small Inexpensive Low-Power Easy to Use Don’t Wear Out
Pyroelectric Sensor: detect levels of infrared radiation Looks to detect motion (change) not average IR levels
Humans skin temperature is about 93 ° F, and radiate infrared energy with a wavelength between 9 and 10 μ m ◦ The sensors are sensitive in the range of 8 to 12 μ m Plastic Housing limits the wavelengths to μ m
Suitable for Enclosed Spaces Burglary Alarm Systems Cameras Office lighting PIR Camera