Thermal detectors are devices that measure temperature changes or detect infrared radiation. They work by sensing the heat emitted by objects, which can be useful in various applications, such as surveillance, firefighting, and industrial monitoring. Common types of thermal detectors include thermocouples, infrared sensors, and pyrometers. These detectors convert thermal energy into an electrical signal, allowing for precise temperature readings. They are widely used in automated systems, safety equipment, and scientific research to monitor heat levels and ensure proper functioning. Their ability to detect heat makes them essential in many fields, including environmental monitoring and medical diagnostics.