Theoretical Principles and Applications of Infrared Thermometers
1. Non-contact measurement: it does not need to contact the internal or surface of the measured temperature field, therefore, it will not interfere with the state of the measured temperature field, and the pyrometer itself is not subject to damage from the temperature field.
2. Wide measurement range: because it is non-contact temperature measurement, so the pyrometer is not in the higher or lower temperature field, but work in the normal temperature or the pyrometer allows the conditions. In general, it can measure negative tens of degrees to more than three thousand degrees.
3. 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.
4. 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.
5. 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. Can carry out temperature measurement of tiny temperature field and
6. Temperature distribution measurement, and temperature measurement of moving or rotating objects. Use ** and long service life.
Disadvantages of infrared thermometer:
1. susceptible to environmental factors (ambient temperature, dust in the air, etc.)
2. For bright or polished metal surfaces of the temperature measurement readings have a greater impact
3. Limited to measuring the temperature of the outside of the object, it is not convenient to measure the temperature inside the object and the presence of obstacles
Notes on the use of infrared thermometer:
(1) must accurately determine the emissivity of the object being measured.
(2) Avoid the influence of high-temperature objects in the surrounding environment.
(3) For transparent materials, the ambient temperature should be lower than the temperature of the object to be measured.
(4) The pyrometer should be vertically aligned with the surface of the object to be measured, in any case, the angle can not exceed 30 ℃
(5) Can not be applied to the temperature measurement of bright or polished metal surfaces, can not be through the glass for temperature measurement;
(6) The correct choice of the coefficient of separation, the target diameter must fill the field of view.
(7) If the infrared thermometer is suddenly in the ambient temperature difference of 20 ℃ or higher, the measurement data will be inaccurate, the temperature equilibrium and then take the temperature value of its measurements...
