Thermal cameras detect heat radiation instead of visible light, enabling reliable surveillance in darkness, glare, vegetation, camouflage, and challenging weather conditions. This paper explains how they are used for early intrusion detection in perimeter protection, triggering alerts, activating deterrents like speakers, and guiding PTZ cameras for visual verification. Thermal imaging also supports privacy since it typically does not capture identifiable details. Key concepts include detection range, NETD, Johnson’s criteria, and environmental impacts such as fog, rain, and absorption. Beyond security, thermal cameras are used in industrial monitoring, such as detecting overheating equipment or heat leaks, making them a versatile tool across applications.

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