Which sensor is described as one of the most highly used sensors, fanning out to cover a large area and can be combined with a perimeter fence and CCTV?

• A. Microwave sensors
• B. Photo-Electric transceivers
• C. Ground based radar
• D. Laser Sensors

Answer: (D)

Laser sensors are used in perimeter security because they can project a fan of narrow, highly directional beams across a large area, creating a virtual fence that detects any interruption. This setup can be laid along a perimeter fence and paired with CCTV so operators can quickly verify and locate intrusions. The beams can be arranged in multiple paths to cover a wide area, giving long-range, precise detection with a clear trigger signal for the cameras to focus on the event. Their key strengths are accuracy, scalability, and straightforward integration with existing surveillance systems, making them a common choice for wide-area security along fences.