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Three resolutions that reflect the performance of the infrared camera
- 2019-06-11-

The thermal imager's technical index resolution includes image resolution, spatial resolution, and temperature resolution. These three resolutions determine the performance of the thermal imaging camera.

Image Resolution

The resolution of the map actually refers to the number of pixels of the thermal image. The higher the resolution of the thermal map, the greater the number of imaging pixels, which means that the more temperature measurement points, the more accurate the temperature measurement will be.

Spatial resolution

Spatial resolution refers to the resolving ability of the infrared thermal imager to the shape of the target space when using an infrared thermal imager for observation. Generally speaking, the smaller the spatial resolution is, the more accurate the temperature measurement is. When the spatial resolution is small, the smallest target to be measured covers the pixels of the infrared camera, and the test temperature is the temperature of the measured target. High, the smallest target to be measured cannot completely cover the pixels of the infrared camera, and the test target will be affected by its ambient radiation. The test temperature is the average temperature of the target and its surrounding temperature, and the value is not accurate enough.

The spatial resolution of an infrared camera is usually expressed in mrad (milli-radians). The smaller the value of mrad, the higher the resolution. The radian value multiplied by the radius is approximately equal to the chord length, which is the diameter of the target.

Temperature resolution

The thermal resolution of a thermal imager refers to the ability of an infrared thermal imager to accurately distinguish the smallest temperature difference of the target radiation from the background.

A smaller temperature resolution means that the infrared camera will be more aware of temperature changes. NETD (Noise Equivalent Temperature Difference) is usually used to express this performance index. For example: NETD = 50mK, which means that if the surface temperature of the measurement object changes by 50mK, the thermal camera can detect the change.

The main purpose of the infrared camera to test the measured object is to find the temperature failure point through the temperature difference. It is not very meaningful to measure the temperature value of a single point. It is mainly to find the relative hotspots through the temperature difference and play a pre-maintenance role .


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