Profile: Rasan Infocom (P) Ltd. deals with energy monitoring, access control system, video door phone, home automation, DVRS & CCTV products, pipe inspection system, door entry system and software development. Thermal imaging technology operates by capturing the upper portion of the infrared light spectrum, which is emitted as heat by objects instead of simply reflected as light. Image-enhancement systems are called night-vision devices (NVDs), which rely on a special tube called an image-intensifier tube, to collect and amplify infrared and visible light.