What are the factors that affect the performance of far infrared thermometers?
1, the size of the temperature measurement target and the relationship between the temperature measurement distance: at different distances, the effective diameter of the measurable target D is different, and thus in the measurement of small targets to pay attention to the target distance. Infrared thermometer distance coefficient K is defined as: the measured target distance L and the measured target diameter D ratio, that is, K = L / D
2, infrared thermometer Select the measured substance emissivity: infrared thermometer is generally by black body (emissivity ε = 1.00) index, 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 must set the emissivity value. The emissivity of the material can be found from the "data about the emissivity of the object in the radiation thermometry".
3, the measurement of the target in the bright background: if the target has a brighter background light (especially by the sun or strong lamps), the accuracy of the measurement will be affected, so we can use the object to block the target's bright light to eliminate the background light interference.
4, the measurement of small targets
(1) infrared thermometer should be fixed on the tripod (optional accessories)
(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 the measured small black dots between the relative motion is not there, then the focusing has been completed
5. Temperature output function
(1) digital signal output - RS232, RS485, temperature signal transmission
(2) Analogue signal output - 0 ~ 5V, 1 ~ 5V, 0 ~ 10V, 0/4 ~ 20 mA, can be added to the closed-loop control.
(3) High alarm, low alarm - the production process requires the control of temperature in a certain range, you can set the high and low alarm values. High alarm: in the case of high alarm settings open, when the temperature is higher than the high alarm value, the corresponding LED lights flashing, buzzer, and AH normally open relay.
Far infrared thermometer features
1. Wide measurement range: because it is non-contact temperature measurement, so the infrared thermometer is not in the higher or lower temperature field, but work in the normal temperature or thermometer allows the conditions. Under normal circumstances can be measured negative tens of degrees to more than three thousand degrees.
2. Temperature measurement speed: that is, the response time is fast. As long as the infrared radiation received by the target can be set in a short period of time.
3. High accuracy: infrared temperature measurement will not destroy the temperature distribution of the object itself as contact temperature measurement, so the measurement accuracy is high.
4. High sensitivity: as long as there is a small change in the temperature of the object, the radiant energy will have a large change, easy to measure. Temperature measurement of tiny temperature field can be carried out.
5. Temperature distribution measurement, as well as temperature measurement of moving or rotating objects, the use of accurate and long service life.
