To read correct temperatures, another important factor needs to be taken into account. That is a factor known as emissivity.
Emissivity is the efficiency, which an object emits infrared radiation and is highly dependent on properties of the material or object. It is a measure of the efficiency of a surface to emit thermal imaging cameras energy relative to a perfect black body source. It directly scales the intensity of the thermal imaging cameras emission and all real values are less than 1.0.
The emissivity may be highly dependent on the surface morphology, roughness, oxidation, spectral wavelength, temperature and view angle. A measurement that does not account for the real emissivity of a surface will appear “colder” than it actually is.
For agricultural applications, many organic materials and materials with very rough surfaces have emissivity values approaching 1.0. For other applications, including power line and solar cell inspection, the surface might be a highly polished glass or metal, both of which can have much lower emissivity values.
It is important for the thermal imaging cameras to be set to the correct emissivity or incorrect temperatures will be measured.
This article comes from dronezon edit released