Motion Sensors

Motion Sensors or Motion detectors are devices that can detect physical movement in a certain area. Some motion sensors can detect movement by a change in speed of something. A tripwire is a simple motion detector. If someone trips the wire the device will sound an alarm. Because this method and other simple motion detectors can be manipulated a better option may be an electronic device. Most motion sensors are capable of detecting motion by optical detection and acoustical detection. If you want a motion sensor that is detected by optical detection it will uses infrared or lasers.

These days' cameras can be used as a motion sensor. These are connected to computers and there they are stored. Most people have a motion sensor in order to detect an unauthorized entry. They are mostly used as part of a larger security system. They have become a standard selling point of many home security system services.

Infrared motion detectors work because the radiation is longer than that of visible light. It can't be seen. It does emanate from heat sources, like people and animals.

You can also get motion sensors for outside your home. But they are most often seen inside homes. So that is what most modles are geared towards.