When sourcing infrared thermal cameras for B2B distribution, understanding specification terminology is critical. Unlike consumer electronics where marketing often obscures technical details, thermal imaging specifications directly determine what problems a camera can solve. This section breaks down the five core attributes that B2B buyers evaluate when they search for thermal camera suppliers on Alibaba.com.
Resolution refers to the number of pixels in the thermal sensor, typically expressed as width × height (e.g., 320×240). Higher resolution provides more detail and allows users to identify smaller temperature anomalies from greater distances. Entry-level cameras start at 96×96 or 120×90 pixels, while professional models reach 640×480 or even 512×384 pixels. Resolution is the most visible specification and often the first filter buyers apply when narrowing their options.
NETD (Noise Equivalent Temperature Difference) measures thermal sensitivity—how small a temperature difference the camera can detect. Expressed in millikelvins (mK), lower NETD values indicate better sensitivity. Professional-grade cameras typically achieve NETD below 50mK, while entry-level models may range from 80mK to 100mK. As one Reddit user noted, "After using it for a while, I realized that high resolution alone cannot compensate for insufficient thermal sensitivity" [3]. This highlights why NETD matters as much as resolution for serious applications.
Temperature Range defines the minimum and maximum temperatures the camera can accurately measure. Common ranges include -20°C to 400°C for general industrial use, -20°C to 650°C for electrical and mechanical applications, and specialized models reaching 1500°C+ for high-temperature industrial processes. Buyers must match the temperature range to their specific use case—electrical panel inspection rarely exceeds 200°C, while furnace monitoring requires much higher ranges.
Frame Rate (measured in Hz) determines how smoothly the thermal image updates. Standard frame rates are 9Hz for entry-level models (limited by export regulations in some countries), 25Hz or 30Hz for professional handheld units, and 50Hz+ for specialized applications requiring real-time monitoring of fast-moving objects. Higher frame rates are essential for scanning electrical panels quickly or monitoring moving machinery.
Field of View (FOV) and Spatial Resolution (IFOV) determine how much area the camera captures and the smallest object it can measure accurately from a given distance. A wide FOV (e.g., 50°) is useful for building inspections where you need to capture entire walls, while narrow FOV (e.g., 15°) with good IFOV allows precise measurement of small components from a distance. Many professional cameras now offer interchangeable lenses or dual-lens systems combining wide and telephoto options.
