The thermal imager's temperature measuring range is frequently another standard that consumers take into account. Everyone wants the thermal imager's temperature measurement range to be as wide as feasible. Do you, however, know what influences the thermal imager's ability to determine temperature at a distance?
1、Lens focal length
The focal length of the lens is crucial in determining how far a thermal imager can measure temperatures. The size of the image the target creates is directly determined by the focal length of the lens. The imaging distance increases with increasing focal length, while the field of vision decreases. In plain English, a thermal imager can see farther with a longer focal length, but the viewing range (horizontal viewing angle) gets smaller.
