Infrared thermometer / fixed temperature meter appear common problems guide
Q:What is the relationship between the size of the temperature measurement target and the measurement distance (the concept of optical resolution)?
A: At different distances, the effective diameter D of the measurable target is different, thus the target distance should be noted when measuring small targets. Infrared thermometer distance coefficient K is defined as: the measured distance from the target L and the measured diameter of the target D ratio, that is, K = L / D
Q: how to use the thermometer to choose the emissivity of the substance under test?
A: Infrared thermometers are generally graded according to the blackbody (emissivity ε = 1.00), but in fact, the emissivity of the substance are less than 1.00. So when you need to measure the real temperature of the target, you should set the emissivity value. The emissivity of the substance can be found from "Data about the emissivity of the object in radiometric thermometry".
Q: How should I measure the target in the background of object glare?
A: If the measured target has a bright background light during the use of the thermometer (especially by sunlight or strong lamps), the accuracy of the measurement will be affected, so we can use the object to block the target's glare to eliminate the interference of the background light.
Q: How to measure a small target with the pyrometer?
A: Aiming and focusing Aiming: the small black dot in the eyepiece is the temperature measurement point, use the black dot to align with the target to be measured Focusing: the objective lens is moved back and forth until the target to be measured is clear, if the diameter of the target to be measured is much larger than the small black dot, it can be used without accurate focusing. Focusing specific methods, please see the manual Measurement of smaller targets, in order to measure the accuracy of the need to focus, that is: the eyepiece in the small black dot on the target (the target should be full of small black dots), the lens will be adjusted forward and backward, the eyes slightly shaken, if there is no relative movement between the measured small black dots, then the focusing of the thermometer has been completed.
Q: infrared thermometer size of the average value of the difference between the measurement function of how to use correctly?
A: Large value function - for the movement of the target (such as steel plate, steel wire) measurement, due to the measured object surface conditions are not the same (such as in the steel plate, steel wire in some places there are iron nitrate, oxidation of the epidermis, etc.), with this function to obtain a more accurate measurement.
Small value function - especially suitable for measuring flame-heated target such process occasions.
Average value function ---- is particularly suitable for measuring melting boiling metal liquid
Difference function ---- may be concerned about how much the measured temperature T fluctuates around a required temperature Tc (comparison temperature), then this function is very convenient, when the instrument displays this difference: "T - Tc"
Q: How does an infrared thermometer work?
A: The infrared thermometer receives invisible infrared energy emitted by a variety of objects themselves. Infrared radiation is part of the electromagnetic spectrum, which includes radio waves, microwaves, visible light, UV, R-rays and X-rays. Infrared is located between visible light and radio waves, infrared wavelengths are often expressed in microns, the wavelength range of 0.7 microns - 1000 microns, in fact, 0.7 microns - 14 microns band used for infrared thermometers.
