1, The relationship between the size of the temperature measurement target and the temperature measurement distance (concept of optical resolution)?

The effective diameter D of measurable targets varies at different distances, so it is important to pay attention to the target distance when measuring small targets. The distance coefficient K of an infrared thermometer is defined as the ratio of the distance L of the measured target to the diameter D of the measured target, i.e. K=L/D

2, How to choose the emissivity of the tested substance?

Infrared thermometers are generally based on blackbody (emissivity ε= 1.00) graduated, but in reality, the emissivity of substances is less than 1.00. Therefore, when measuring the true temperature of the target, the emissivity value must be set. The emissivity of substances can be obtained from the "Data on the emissivity of objects in radiation thermometry".

3, How to measure targets in a strong light background?

4, How to measure small targets?

(2) Focusing is required, that is, use the small black spots in the eyepiece to aim at the target (the target should be full of small black spots), adjust the lens back and forth, and shake the eyes slightly. If there is no relative movement between the small black dots measured, focusing is completed