There are many advantages to using infrared pyrometer for non-contact temperature measurement. Its application ranges from small or hard-to-reach objects to corrosive chemicals and sensitive surface objects. This article will discuss this advantage, give the decisiveness of choosing the infrared pyrometer correctly, and explain the scope of application. Due to the movement of atoms and molecules, every object radiates electromagnetic waves. The most important wavelength or spectral range for non-contact temperature measurement is 0.2 to 2.0 μm. The natural rays in this range are called thermal radiation or infrared rays.

The test instrument for temperature measurement by the infrared rays radiated by the measured object is called a radiation thermometer, radiation pyrometer or infrared pyrometer according to the German industrial standard DIN16160. These names also apply to instruments that measure temperature by visible colored rays radiated by the measured body, and instruments that derive temperature from the radiation density of the relative frequency spectrum.

There are many advantages for non-contact temperature measurement by receiving infrared rays radiated by the measured body. In this way, objects that are difficult to reach or in motion can be measured without any problems, such as materials with poor heat transfer performance or small heat capacity. The infrared pyrometer's short response time can quickly realize an effective adjustment loop. The pyrometer does not have parts that wear out, so there is no continuous cost as with the use of a thermometer. Especially for small objects to be measured, such as contact measurement, large measurement errors will occur due to the thermal conductivity of the object. Here, the infrared pyrometer can be used without any doubt, and for corrosive chemicals or sensitive surfaces, such as paint, paper and plastic rails. Through remote remote control measurement, it can be far away from the dangerous area, so that the operator is not dangerous.

The infrared pyrometer focuses the infrared rays received from the object to be measured on the detector through a lens through a filter. The detector generates a current or voltage signal proportional to the temperature by integrating the radiation density of the measured object. In the electrical components connected thereafter, the temperature signal is linearized, the emissivity area is corrected, and converted into a standard The output signal.

In principle, there are two types of infrared pyrometers: portable pyrometers and fixed pyrometers. Therefore, when choosing a suitable infrared pyrometer for different measurement points, the features of sight, lens, sensor, that is, spectral receiver, etc., will be the main Selection criteria.