Photoelectric Laser Motion Detector Sensor 

These sensors detect motion or presence of objects using light-based technologies.
Types:
1. Through-Beam: Separate emitter and receiver.
2. Retroreflective: Uses reflector; detects beam interruption.
3. Diffuse Reflection: Detects reflection off target object.

Applications- Industrial Automation: Detect parts on conveyors.- Security Systems: Motion detection for alarms.- Parking Systems: Detect vehicle presence.- Robotics: Obstacle detection.