Infrared (IR) detectors are devices that sense infrared radiation, which is emitted by objects based on their temperature. They are commonly used in various applications, including night vision, thermal imaging, and motion detection. These detectors can convert IR radiation into electrical signals, allowing for the measurement of heat and the detection of objects in low-light conditions. There are different types of IR detectors, such as thermal detectors and quantum detectors. Thermal detectors respond to changes in temperature, while quantum detectors are sensitive to specific wavelengths of IR radiation. Both types play crucial roles in fields like security, automotive safety, and environmental monitoring.