Non-contact temperature measurement with infrared pyrometers has many advantages, ranging from small or hard-to-reach objects to corrosive chemicals and sensitive surfaces. This article will discuss this advantage, give the decisive choice of the correct infrared pyrometer, etc. to explain the scope of application.

Every object radiates electromagnetic waves due to the motion of atoms and molecules, and the wavelength or spectral range most important for non-contact temperature measurement is in the 0.2 to 2.0 μm range. Natural rays in this range are called thermal radiation or infrared rays.
For example, in many sensing technology fields, the development trend of pyrometers is also moving towards small, compact shapes, round, and threaded housings that are installed on machines and equipment. The realization of this development trend is the Through continuous miniaturization of electrical components, and a high degree of calculus, smaller and more delicate electrical components are concentrated in smaller and smaller spaces. Compared with the past analog technology, through the application of micro-controllers, the high precision of the linearization of the detector signal is improved, and thus the precision of the instrument is also improved.