Infrared detectors are devices used to detect and measure infrared radiation, which is a form of electromagnetic radiation with longer wavelengths than visible light. These detectors are commonly used in a variety of applications, including thermal imaging, night vision, remote sensing, and medical imaging. They work by converting infrared radiation into an electrical signal, which can then be processed and analyzed. Infrared detectors are important tools for detecting heat signatures, monitoring temperature changes, and identifying objects in low-light conditions.