High-temperature Camera Thermometer Applications in Steel Industry
1, The relationship between the size of the temperature measurement target and the temperature measurement distance
The effective diameter of measurable targets varies at different distances, so attention should be paid 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, that is, K=L/D
2, Select the emissivity of the tested substance
Infrared thermometers are generally divided by blackbody (emissivity ε=1.00), 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 a substance can be found in the "Data on Object Emissivity in Radiation Thermometry".
3, Measurement of targets in strong light background
If the target being measured has bright background light (especially direct sunlight or strong lights), the accuracy of the measurement will be affected. Therefore, objects can be used to block the strong light of the direct target to eliminate background light interference.
4, Measurement of Small Targets
Aiming and Focusing
Aiming: The small black dot in the eyepiece is the temperature measurement point, and the black dot is aimed at the target being measured
Focusing: Move the objective lens back and forth until the measured target is clearest. If the diameter of the measured target is much larger than the small black dot, precise focusing may not be required. Please refer to the instruction manual for specific focusing methods
When measuring smaller targets, in order to ensure measurement accuracy
⑴ The thermometer should be fixed on the tripod (optional accessory)
(2) Accurate 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 slightly shake the eyes. If there is no relative movement between the small black dots measured, the focusing is completed
