Analysis of Five Factors Affecting Temperature Measurement of Infrared Thermometer
1. The relationship between the temperature measurement target size and the temperature measurement distance
At different distances, the effective diameter of the measurable target is different, so pay attention to the target distance when measuring small targets. The definition of the distance coefficient K of the infrared thermometer is: 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 measured substance
Infrared thermometers are generally graded according to black bodies (emissivity ε=1.00), but in fact, the emissivity of substances is less than 1.00. Therefore, when the real temperature of the target needs to be measured, the emissivity value must be set. The emissivity of matter can be found from "Data on emissivity of objects in radiation thermometry".
3. Measurement of targets in strong light background
If the measured target has a bright background light (especially when it is directly illuminated by sunlight or strong lights), the accuracy of the measurement will be affected. Therefore, objects can be used to block the strong light directly hitting the target to eliminate background light interference.
Fourth, the measurement of small targets
aiming and focusing
Aiming: The small black dot in the eyepiece is the temperature measurement point, use the black dot to aim at the measured target
Focusing: Move the objective lens back and forth until the measured object is clearly visible. If the diameter of the measured object is much larger than the small black dot, it is not necessary to perform full focus adjustment. Please refer to the instruction manual for the specific method of focusing
When measuring smaller targets, for measurement accuracy
⑴The thermometer should be fixed on the tripod (optional accessory)
⑵Accurate focusing is required, that is: use the small black dots in the eyepiece to aim at the target (the target should be full of small black dots), adjust the lens back and forth, and shake your eyes slightly. If there is no relative movement between the measured small black dots, adjust the coke is done
Five, the use of the maximum value, minimum value, average value, difference measurement function
⑴Maximum value function———————When measuring moving targets (such as steel plate and steel wire production), due to the different surface conditions of the measured object (such as steel plates and steel wires in production, there are iron nitrates, oxidized skin, etc. ), use this function to get more accurate measurement
⑵Minimum value function———————Especially suitable for the production process of measuring the target of flame heating
⑶Average function————————Especially suitable for measuring molten and boiling metal liquid
⑷Difference function———————— Sometimes, you may be very concerned that the measured temperature T is moving around a required temperature Tc (comparison temperature), so this function is very convenient. At this time, the instrument displays the difference: "T - Tc"
