Infrared thermometer principle_Infrared thermometer calibration
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. 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. So, what is the principle of an infrared thermometer? What should be noted when using?
The principle of infrared thermometer is as follows:
1. Infrared principle
Any object with a temperature above absolute zero (-273 ℃) emits thermal radiation to the outside. The energy radiated varies depending on the temperature of the object, and the wavelength of the radiation wave is also different. However, infrared radiation is always included. For objects below a thousand degrees Celsius, the strong electromagnetic waves in their thermal radiation are infrared waves. Therefore, measuring the infrared radiation of the object itself can accurately determine its surface temperature, which is the objective basis for infrared thermometer temperature measurement.
2. Working principle
The non-contact infrared thermometer consists of an optical system, a photodetector, a signal amplifier, signal processing, display output, and other components. The optical system gathers the infrared energy radiated by the target object, focuses it on the photodetector, and converts it into a corresponding electrical signal. After passing through the circuit operation and processing circuit, it is converted into a linear temperature signal value of the measured target for further signal processing and control.
Calibration steps for infrared thermometer
According to the temperature measurement range, place a metal material sample with a diameter larger than the required infrared thermometer diameter in the resistance furnace. Test the standard S-type precious metal thermocouple mentioned above, using the thermocouple as the reference temperature source. To ensure the relative stability of the temperature source, the expansion uncertainty of the benchmark calibration temperature source should not exceed the table.
Calibration method: Calibrate the environmental conditions, with a reference standard of ambient temperature (18-25 ° C), and the working environment humidity of the electrical measuring device should be consistent with it.
