The measuring spot (also known as spot size) on infrared measuring devices – such as infrared thermometers or thermal imaging cameras – describes the actual area whose temperature the device measures at a specific distance.

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Thermal imaging cameras are specialised infrared cameras that convert this radiation into a colour-coded image to visually represent temperature differences. Thermal imaging cameras work by detecting the infrared radiation emitted by surfaces, which every body above absolute zero emits. A detector converts this radiation into electrical signals, which are then translated by the camera electronics into a colour-coded image that makes temperature differences visible. This allows you to see at a glance which areas are warmer or colder without having to make direct contact.

Infrared cameras are used, for example, in building thermography or to detect defective cable connections. They are also used by fire brigades to search for embers, in industry to test electrical systems, and in human medicine to detect areas of inflammation.

An infrared temperature measuring device measures the infrared radiation emitted by an object, which is related to its surface temperature. A detector in the device converts this radiation into an electrical signal that calculates the temperature. This allows the temperature to be determined quickly and without contact, even for very hot, moving or difficult-to-access objects.