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What is the principle of infrared thermometer?

What is the principle of infrared thermometer? What should we pay attention to when using it?

Infrared temperature measurement technology plays an important role in the production process, product quality control and monitoring, equipment online fault diagnosis and safety protection and energy saving. 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. So, what is the principle of infrared thermometer? What should we pay attention to when using it?

First, the principle of infrared thermometer

1. Infrared principle

Any object as long as its temperature is higher than absolute zero (-273℃), there will be thermal radiation emitted to the outside, the temperature of the object is different, its radiation energy is different, and the wavelength of the radiation wave is different, but always contains infrared radiation, the object below one thousand degrees Celsius, the strong electromagnetic wave in the thermal radiation is infrared wave, so the measurement of the object's own infrared radiation, It can accurately measure its surface temperature, which is the objective basis of infrared thermometer temperature measurement.

2. Working principle

Non-contact infrared thermometer is composed of optical system, photodetector, signal amplifier, signal processing, display output and so on. The optical system gathers the infrared energy radiated by the target object, focuses it on the photodetector, and converts it into the corresponding electrical signal, and then converts it into the linear temperature signal value of the measured target after the circuit calculation and processing circuit, so as to realize further signal processing and control.

Two, the use of infrared thermometer precautions

1. The emissivity of the measured object must be accurately determined;

2. Avoid the influence of high temperature objects in the surrounding environment;

3, for transparent materials, the ambient temperature should be lower than the temperature of the measured object;

4, the thermometer should be vertically aligned with the surface of the measured object, in any case, the Angle should not exceed 30℃;

5, can be applied to the temperature measurement of bright or polished metal surface, not through the glass temperature measurement;

6, the correct choice of the following coefficient, the target diameter must be full of field of view;

7. If the infrared thermometer is suddenly in the case of ambient temperature difference of 20℃ or higher, the measurement data will be inaccurate, and the temperature value measured will be taken after the temperature balance

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