Thermal imaging cameras have a technical indicator resolution of three, including spatial resolution, image resolution, and temperature resolution.

Spatial resolution

Spatial resolution refers to the ability of an infrared thermal imager to distinguish the shape of a target space when it is observed using an infrared thermal imaging camera. Generally speaking, the smaller the spatial resolution, the more accurate the temperature measurement, when the spatial resolution is small, the target is covered with the pixels of the Infrared thermal Imager, the temperature of the test is the temperature of the target measured, the spatial resolution is high, the target can not fully cover the pixels of the Infrared thermal Imager, the test target will be affected by its environmental radiation The test temperature is the average temperature of the measured target and its surrounding temperature, and the value is not accurate enough. The spatial resolution of an infrared thermal imager is usually expressed in mrad (Milliwatts). The smaller the value of the mrad, the higher its resolution. The Radian value multiplied by the radius is approximately equal to the chord length, that is, the diameter of the target.

Image resolution

Graph resolution actually refers to the number of pixels of the thermal image, the higher the resolution of the heat map, the more pixels of the image, but also means that the more temperature points, the temperature measurement will be more accurate.

Temperature resolution

The temperature resolution of the thermal imaging camera refers to the ability of the infrared thermal Imager to accurately distinguish the minimum temperature difference of the target radiation from the background.

The smaller the temperature resolution, the more obvious the infrared Thermal Imager's perception of temperature changes. NETD (Noise equivalent temperature difference) is usually used to express this performance indicator. For example, NETD=50mK, which means that measuring the surface temperature of an object changes by 50mK thermal imaging cameras can perceive changes.Infrared Thermal Imaging CameraThe main purpose of testing the measured object is to find the temperature fault point through the temperature difference, it does not make much sense to measure the temperature value of a single point, mainly through the temperature difference to find the relative hotspot, play the role of pre-maintenance.