Infrared thermometer determines target size
According to the principle, infrared thermometers can be divided into monochromatic thermometers and dual-color thermometers (radiation colorimetric thermometers). For monochromatic thermometers, when measuring temperature, the area of the target to be measured should fill the field of view of the thermometer. It is recommended that the size of the target to be measured exceed 50% of the size of the field of view. If the size of the target is smaller than the field of view, the background radiant energy will enter the thermometer's apparent sound branch to interfere with the temperature measurement reading, causing errors. Conversely, if the target is larger than the thermometer's field of view, the thermometer will not be affected by the background outside the measurement area. For the colorimeter thermometer, if the field of view is not full, there are smoke, dust, and obstructions on the measurement path, and when the radiation energy is attenuated, it will not have a significant impact on the measurement results. For small, moving or vibrating targets, a colorimetric thermometer is the best choice. This is due to the small diameter and flexibility of the light rays, which can transmit optical radiation energy in curved, blocked and folded channels.
For some thermometers, the temperature is determined by the ratio of the radiated energy in two separate wavelength bands. Therefore, when the measured target is small and not full of the site, and the presence of smoke, dust, and obstructions on the measurement path will attenuate the radiation energy, it will not affect the measurement results. The required temperature measurement accuracy can be guaranteed even when the energy is attenuated by 95%. For objects that are small and in motion or vibrating; sometimes move within the field of view, or may partially move out of the field of view, under these conditions, the use of a two-color thermometer is the best choice. If it is impossible to directly aim between the thermometer and the target, and the measurement channel is curved, narrow, or obstructed, the dual-color fiber optic thermometer is the best choice. This is due to its small diameter and flexibility to transmit optical radiant energy across curved, blocked and folded channels, making it possible to measure targets that are difficult to access, harsh conditions, or close to electromagnetic fields.
