Problems with motion sensors?

Question

I posted this elsewhere but its not doing anygood so I thought there might be a scientific reason why you can fool them anyway, I'm thinking about getting a motion sensor for my shop but I've heard that they are easily fooled. How? and should I look at getting something else.

Answer 1

Most motion sensors are infrared detectors and work by detecting a change in amount of IR in different segments of a simple multipart array. When a warm body leaves one segment and enters the next, a switch is triggered.
Among the problems are that if no one is moving, there can be a room full of people and they don't trigger - as when one turned off the classroom lights because I stood still too long while teaching.
Since they react to a difference in heat, if the air and ground temperature is about skin temperature, they don't trigger because there is no difference. and ironically, if it is very cold and people are completely bundled up in insulating material that is cold on the outside, they don't trigger.
In theory, holding a thin insulating foam board between oneself and a sensor would prevent it from triggering, but multiple sensors on different walls should take care of that.

Answer 2

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