Infrared Thermometer Principle

Infrared temperature measurement technology plays an important role in the production process, in product quality control and monitoring, equipment online fault diagnosis and safety protection, and energy saving. In the past 20 years, non-contact infrared human body thermometers have been rapidly developed in technology, performance has been continuously improved, functions have been continuously enhanced, varieties have been increasing, and the scope of application has also been expanding. Compared with the contact temperature measurement method, infrared temperature measurement has the advantages of fast response time, non-contact, safe use and long service life. The non-contact infrared thermometer includes three series: portable, online and scanning, and is equipped with various options and computer software. Each series has various models and specifications. Among various types of thermometers with different specifications, it is very important for users to choose the correct infrared thermometer model.

Application range

Electricity: Temperature protection and signal transmission of coal-fired power plants, gas-fired thermal power plants, hydropower stations, nuclear power plants, district heating pipeline networks, large power transformers, etc.

Metallurgy: aluminum plant, copper plant, steel plant, etc.

Petrochemical: oil production, oil pipelines, petrochemical plants, oil refineries.

General industry: Refrigerator factory, air conditioner factory, refrigerator factory, brewery, pharmaceutical factory, automobile factory.

Temperature element manufacturer: platinum resistance, thermocouple and compensation wire and cable, temperature switch, temperature sensor manufacturer.

Transportation: Aircraft maintenance at the airport, large-scale transportation power system maintenance, and ocean shipping as in-service maintenance measurement methods.

Infrared thermometer principle

The optical system collects the target infrared radiation energy in its field of view, and the size of the field of view is determined by the optical parts and position of the thermometer. Infrared energy is focused on the photoelectric detector and converted into corresponding electrical signals. The signal is converted into the temperature value of the measured target after being corrected by the amplifier and the signal processing circuit according to the internal algorithm of the instrument and the target emissivity. In addition, the environmental conditions of the target and the thermometer, such as temperature, atmosphere, pollution and interference, etc., should also be considered to affect the performance index and correction methods.

All objects with a temperature above absolute zero are constantly emitting infrared radiation energy into the surrounding space. The size of the infrared radiation energy of an object and its distribution according to wavelength are closely related to its surface temperature. Therefore, by measuring the infrared energy radiated by the object itself, it can accurately determine its surface temperature, which is the objective basis on which infrared radiation temperature measurement is based.