16-01-2014, 03:22 PM
A Abstract On PIR SENSOR
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INTRODUCTION:-
A PIR Sensor is a Passive Infrared Sensor which controls the switching on/off of the ighting load when it detects a moving target. The built in sensor turns on/off the connected lighting load when it detects motion in the coverage area. It has different working principle during the day time and the night time. During the day, the built in photocell sensor saves electricity by deactivating the lighting load connected to the sensor. During the night the connected lighting load is turned on by adjusting the luminosity knob (LUX). An adjustable time knob lets you select how long the light stays on after activation.
PRINCIPLE:
The PIR Sensor senses the motion of a human body by the change in surrounding ambient temperature when a human body passes across. Then it turns on the lighting load to which it is connected. The lighting load remains on until it senses motion. Once the motion is seized it switches off the lighting load. During the night, the LUX adjustment knob allows you to adjust the luminosity based on which the lighting load will either switch on/off automatically.
APPLICATIONS:-
Common toilets, for lights & exhaust fans.
Common staircases
For parking lights
For garden lights
For changing rooms in shops
For corridors
And many more
CONCLUSION:-
While a number of technologies for motion detection exist, including ultrasonic and microwave radiation sensors, the PIR sensor is popular for its ease-of-setup and high performance. In addition, PIR sensors are inexpensive and draw little power.