Measurement principles, standards and advantages of external thermometers
There are many advantages to using infrared thermometers for non-contact temperature measurement, ranging from small or difficult to reach objects to corrosive chemicals and sensitive surfaces. This article will discuss the advantages and provide a decisive explanation for the correct selection of infrared thermometers in terms of their application scope. Due to the motion of atoms and molecules, every object emits electromagnetic waves, and the most important wavelength or spectral range for non-contact temperature measurement is between 0.2 and 2.0 μ m. The natural rays within this range are referred to as thermal radiation or infrared radiation.
The testing instrument for temperature measurement using infrared radiation emitted by the tested object is called a radiation thermometer, radiation thermometer, or infrared thermometer according to the German industrial standard DIN16160. These names also apply to instruments that measure temperature using visible colored radiation emitted by the object being measured, as well as instruments that derive temperature from the radiation density of the relative spectrum.
The advantages of infrared thermometer temperature measurement
There are many advantages to non-contact temperature measurement by receiving infrared radiation from the measured object. In this way, temperature measurement can be carried out without any problem for objects that are difficult to reach or move, such as materials with poor heat transfer performance or very small heat capacity. The infrared thermometer has a short response time and can quickly achieve effective adjustment of the circuit. The thermometer does not have components that wear out, so there is no continuous cost like using a thermometer. Especially in very small objects being measured, such as using contact measurement, significant measurement errors will occur due to the thermal conductivity of the object. There is no doubt that thermometers can be used here, as well as for corrosive chemicals or sensitive surfaces such as paint, paper, and plastic tracks. By remote control measurement, it is possible to stay away from dangerous areas and ensure that operators are not at risk.
The principle and structure of infrared thermometer
Focus the infrared radiation received from the object being measured onto the detector through a lens and filter. The detector generates a current or voltage signal proportional to temperature by integrating the radiation density of the measured object. In the subsequent connected electrical components, this temperature signal is linearized, the emissivity region is corrected, and converted into a standard output signal.
