According to experiments conducted by security camera experts on infrared smart cameras, the radiance of actual objects is related to the material properties and surface states of the objects, in addition to temperature and wavelength. It is verified that the emissivity is the commonly mentioned emissivity, or the specific emissivity (which is defined as the ratio of the actual object to the black body radiation performance of the same temperature). The factors affecting the emissivity of the infrared smart camera have the following three aspects. .
1. Effects of different material properties
Materials of different natures have different emission properties due to their absorption or reflection properties, so their emission properties should also be different. Generally, when the temperature is lower than 300 K, the emissivity of the metal oxide is generally greater than 0.8.
2. Surface state effect
The surface of any actual object is not absolutely smooth and will always exhibit different surface roughness. Therefore, this different surface morphology will affect the reflectivity and thus the emissivity value. The magnitude of this effect depends on the type of material.
For example, for non-metallic dielectric materials, emissivity is less or unaffected by surface roughness. However, for metallic materials, surface roughness will have a large impact on emissivity. Such as wrought iron, when the surface condition is matte, the emissivity is 0.94 when the temperature is 300K; when the surface condition is polished, the emissivity is only 0.28 when the temperature is 310K.
In addition, it should be emphasized that in addition to surface roughness, some human factors, such as the application of lubricating oil and other deposits (such as paint), will significantly affect the emissivity of the object.
Therefore, when testing, we should first clarify the emissivity of the measured object. Under normal circumstances, we do not understand the emissivity, then only use the phase comparison method to identify the fault. For power equipment, the emissivity is generally between 0.85 and 0.95.
3. Temperature effect
The effect of temperature on objects of different nature is different, and it is difficult to make quantitative analysis, only pay attention during the detection process.
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