The effect of object emissivity on radiation temperature measurement:
The actual objects that exist in nature are almost never blackbodies. The radiation level of all actual objects depends not only on the radiation wavelength and temperature of the object, but also on factors such as the type of material, preparation method, thermal process, surface state, and environmental conditions that make up the object. Therefore, in order to make the blackbody radiation law applicable to all practical objects, a proportionality coefficient related to material properties and surface states, namely emissivity, must be introduced. This coefficient represents the degree to which the thermal radiation of an actual object is close to blackbody radiation, with values between zero and values less than 1. According to the law of radiation, as long as the emissivity of a material is known, the infrared radiation characteristics of any object are known. The main factors affecting emissivity include material type, surface roughness, physical and chemical structure, and material thickness.
When using an infrared thermometer to measure the temperature of a target, the first step is to measure the infrared radiation of the target within its wavelength range, and then the thermometer calculates the temperature of the measured target. Monochromatic thermometers are proportional to the radiation within the frequency band; The dual color thermometer is proportional to the ratio of radiation in two bands.
The non-contact infrared aluminum thermometer uses infrared technology to quickly and conveniently measure the surface temperature of objects. This type of instrument can quickly generate temperature readings without touching objects. The temperature is displayed on the LCD screen. Lightweight, sophisticated, and easy-to-use infrared thermometers and thermal imagers can safely measure high temperature, hazardous, or difficult to contact surfaces without contaminating or damaging the object being measured. In addition, infrared thermometers can generate several readings per second, while contact thermometers may take several minutes to measure each time.
