Understanding how high-speed infrared thermometers work
High-speed infrared thermometer consists of optical system, photoelectric detector, signal amplifier and signal processing, display output and other components. High-speed infrared thermometer is through the infrared detector (thermal detector and photoelectric detector) will be infrared radiation energy measured and converted into electrical signals, and then converted to temperature according to the basic law of radiation.
The optical system collects the target infrared radiation energy within its field of view, the size of which is determined by the optical components of the pyrometer as well as its position. The infrared energy is focused on the photodetector and converted into a corresponding electrical signal. This signal is converted into a temperature value for the target by an amplifier and signal processing circuitry, calculated according to an algorithm within the instrument and corrected for the target emissivity. In addition, the environmental conditions where the target and the pyrometer are located, such as temperature, atmosphere, pollution and interference, etc., should be considered on the impact of performance indicators and correction methods.
High-speed infrared thermometer used to measure the surface temperature of the object, the thermometer's optical elements emitted, reflected and through the energy convergence to the detector, the thermometer's electronic components will be converted into temperature readings and displayed on the thermometer's display panel. The temperature displayed by the infrared thermometer is often referred to as the brightness temperature of the target, which differs from the real temperature of the object because the emissivity of the object has an effect on the radiant temperature, and almost all real objects that exist in nature are not black bodies. All real objects of radiation in addition to the dependence on the wavelength of radiation and the temperature of the object, but also with the type of material constituting the object, preparation methods, thermal processes, as well as the surface state and environmental conditions and other factors. Therefore, in order for the blackbody radiation law to apply to all real objects, a scaling factor, the emissivity, which is related to the nature of the material and the state of the surface, must be introduced. This coefficient indicates how close the thermal radiation of the actual object is to the blackbody radiation, and its value is between 0 and 1. According to the law of radiation, as soon as the emissivity of a material is known, the infrared radiation properties of any object are known
