A thermal sensor is a device that detects temperature changes in its environment. It works by measuring the infrared radiation emitted by objects, allowing it to determine their temperature without direct contact. Common types of thermal sensors include thermocouples, thermistors, and infrared sensors, each with specific applications in various fields. These sensors are widely used in industries such as automotive, healthcare, and building management. For example, in healthcare, thermal sensors can monitor body temperature to help detect fevers, while in building management, they can optimize heating and cooling systems for energy efficiency.