Basic principles and applications of infrared thermometers
Infrared temperature measurement technology plays an important role in product quality control and monitoring, online fault diagnosis and safety protection of equipment, and energy conservation in the production process. In the past 20 years, non-contact infrared human body thermometers have developed rapidly in technology, with continuously improved performance, enhanced functions, increasing varieties, and expanding applicability. Compared to contact based temperature measurement methods, infrared temperature measurement has advantages such as fast response time, non-contact, safe use, and long service life. Non contact infrared thermometers include three series: portable, online, and scanning, and are equipped with various options and computer software. Each series also has various models and specifications. Choosing the correct infrared thermometer model is crucial for users among various types of thermometers with different specifications.
The wavelength of infrared radiation ranges from 0.76 to 100 μ m and can be divided into four categories: near-infrared, mid infrared, far-infrared, and extremely far-infrared. Its position in the continuous spectrum of electromagnetic waves is in the region between radio waves and visible light. Infrared radiation is the most widespread electromagnetic radiation that exists in nature. It is based on the irregular motion of molecules and atoms of any object in a conventional environment, constantly radiating thermal infrared energy. The more intense the motion of molecules and atoms, the greater the energy radiated, and vice versa, the smaller the energy radiated.
Objects with temperatures above absolute zero will emit infrared radiation due to their molecular motion. After converting the power signal radiated by an object into an electrical signal through an infrared detector, the output signal of the imaging device can simulate the spatial distribution of the surface temperature of the scanned object one-to-one. After processing by the electronic system, it is transmitted to the display screen to obtain a thermal image corresponding to the surface heat distribution of the object. By using this method, it is possible to achieve remote thermal imaging and temperature measurement of the target, and analyze and judge it.
