Thermal detectors are devices that measure temperature changes or thermal radiation. They work by detecting the heat emitted from objects, which can be useful in various applications, such as fire detection, infrared imaging, and temperature monitoring. These detectors can be made from different materials, including semiconductors and thermocouples, which respond to temperature variations. These detectors are commonly used in industries like automotive, aerospace, and medical fields. They help ensure safety and efficiency by monitoring heat levels in machinery, detecting overheating, or even measuring body temperature. Overall, thermal detectors play a crucial role in many technological advancements.