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  Motion Sensors  
     
 
Motion sensing light has a wide field of view because of the lens covering the sensor. Infrared energy is a form of light, so you can focus and bend it with plastic lenses. But it's not like there is a 2-D array of sensors in there. There is a single sensors inside looking for changes in infrared energy.All of these are active sensors. They inject energy into the environment in order to detect a change of some sort.
  
     
 
Video cameras that have motion-sensing capabilities have been around for a while. A motion sensor camera is different though. These devices are actually small pinhole cameras built right into a traditional PIR motion detector shell. Each of these hidden cameras is made to look exactly like a typical motion sensor that comes with any standard alarm-based security systems.
 
     
 
It is common for stores to have a beam of light crossing the room near the door, and a photo sensor on the other side of the room. When a customer breaks the beam, the photo sensor detects the change in the amount of light and rings a bell.
 
     
 
Many grocery stores have automatic door openers that use a very simple form of radar to detect when someone passes near the door. The box above the door sends out a burst of microwave radio energy and waits for the reflected energy to bounce back. When a person moves into the field of microwave energy, it changes the amount of reflected energy or the time it takes for the reflection to arrive, and the box opens the door. Since these devices use radar, they often set off radar detectors.
 
     
 
The same thing can be done with ultrasonic sound waves, bouncing them off a target and waiting for the echo.
 
     
 
The devices themselves are simple electronic components not unlike a photo sensor. The infrared light bumps electrons off a substrate, and these electrons can be detected and amplified into a signal.
  
     
  Hidden Camera  
     
 
S.No Image Name Description
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2 camera in wall clock, hidden camera, security camera Wall Clock Cam  
3 camera in wrist watch, security camera, hidden camera, Watch Cam  
4 hidden camera in pen, pen camera, security camera, hidden camera Pen Cam  
       
 
 

 

 
   
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