How Motion Sensors Work

Posted by delaney1019 | Filed under Uncategorized

If you have a burglar alarm with motion sensors, you may have noticed that the motion sensors cannot “see” you when you are outside looking through a window. That is because glass is not very transparent to infrared energy. This, by the way, is the basis of a greenhouse. Light passes through the glass into the greenhouse and heats things up inside the greenhouse. The glass is then opaque to the infrared energy these heated things are emitting, so the heat is trapped inside the greenhouse. It makes sense that a motion detector sensitive to infrared energy cannot see through glass windows.

Permalink | June 8th, 2009

2 Responses

  1. I Make Thousands of Dollars a Month Posting Links on Google from Home Says:
    June 9th, 2009 1:41 am

    Hey, nice post, really well written. You should post more about this.

  2. delaney1019@yahoo.com Says:
    June 10th, 2009 5:08 am

    Thank You ! I really appreciate your comment. Feel free to visit and comment again.

Leave a Reply