Infrared Thermometer Influence Factors/Material Emissivity/Distance Factor Guide
First, the size of the temperature measurement target and the relationship between the infrared thermometer distance
At different distances, the effective diameter of the measurable target is different, and thus the target distance should be noted when measuring small targets. Infrared thermometer distance coefficient K is defined as: the distance of the measured target L and the diameter of the measured target D ratio, that is, K = L / D
Second, the choice of the measured substance emissivity
Infrared thermometer/online pyrometer is generally graded by blackbody (emissivity ε = 1.00), and in fact, the emissivity of the substance are less than 1.00. Therefore, when you need to measure the true temperature of the target, you have to set the emissivity value. The emissivity of matter can be found in "Data on the emissivity of objects in radiometric thermometry".
Measurement of targets in bright background
If the target to be measured has a bright background light (especially by the sun or strong lamp direct light), the accuracy of the measurement will be affected, so the object can be used to block the direct target of the strong light to eliminate the 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, with the black dot aligned with the measured target
Focusing: the objective lens is moved back and forth until the measured target is the clearest, if the diameter of the measured target is much larger than the small black dot, you can not make precise focusing. Focusing specific methods please see the instructions
When measuring smaller targets, in order to measure the accuracy of
(1) The pyrometer should be fixed on a tripod (optional accessory)
(2) the need for accurate focusing, that is: with the eyepiece in the small black dot on the target (the target should be full of small black dots), the lens will be adjusted back and forth, the eyes slightly shaken, if there is no relative movement between the small black dots being measured, then the focusing has been completed
Fifth, the maximum value, minimum value, average value, the difference between the use of measurement functions
(1) the maximum value of the function ------- for the movement of the target (such as steel plates, steel wire production) measurement, due to the measured object surface conditions are not the same (such as the production of steel plates, steel wire some places have iron nitrate, oxidation of the epidermis, etc.), the use of this function to obtain more accurate measurements
(2) The minimum value function ------- is particularly suitable for measuring flame-heated targets in such production processes.
(3) The average value function ------- is particularly suitable for the measurement of melting and boiling metal liquids.
(4) Difference function ------- sometimes, may be very concerned about the measured temperature T in a required temperature Tc (comparison temperature) near the much movement, then this function is very convenient, then the instrument displays the difference: "T - Tc" Maximum, minimum, average, difference function meaning
