Infrared Detector Trade-offs

Cooled Versus Uncooled Infrared Detectors Balance Sensitivity Against Cost and Power

Choosing between cooled and uncooled infrared detectors is a foundational decision that affects performance, cost, size, power use and maintenance. Uncooled detectors use microbolometers—commonly made with vanadium oxide or amorphous silicon—to measure temperature-driven resistance changes without a cooling system. Their low cost, compact design, low power consumption and maintenance-free operation make them common in handheld thermal imagers, automotive night vision, drones and security systems. However, room-temperature thermal radiation creates additional noise, typically limiting sensitivity to about 30–60 mK, which is adequate for most industrial and surveillance applications but may not suit tasks requiring detection of very weak temperature differences.

Key Points