How an infrared thermometer measures slope and emissivity
How to determine slope
Effective methods of determining slope include measuring the object's temperature using a probe (such as an RTD), thermocouple, or other suitable method. After obtaining the actual temperature, adjust the emissivity setting until the temperature reading of the sensor head is equal to the actual measured temperature, and the correct slope value is obtained.
How to determine emissivity
1. Use a probe (such as RTD), thermocouple, or other suitable method to measure the actual temperature of the object. Adjust the emissivity value until the temperature reading of the sensor head is the same as the actual temperature, that is, the correct emissivity is obtained.
2. If part of the surface of the object can be coated, the surface of the object can be blackened with matte carbon black. At this time, the emissivity is approximately 0.98. Set the emissivity to 0.98 and measure the temperature of the blackened part. Finally, measure the area adjacent to the blackened part of the object and adjust the emissivity until the temperature reading is equal to the actual temperature. The correct emissivity is now obtained.
Optimize surface temperature measurement according to the following guidelines:
1. Use a measuring instrument to measure the emissivity of an object.
2. Try to avoid reflection; shield the object from high-temperature heat sources in the surrounding environment.
3. When the object temperature is high, if there are several partially overlapping wavelengths available, choose the shorter wavelength.
4. For translucent materials, such as glass; when measuring temperature, ensure that the background temperature is uniform and lower than the object temperature.
5. When the emissivity is less than 0.9, the sensor head and the surface of the target object should be kept as vertical as possible. Do not allow the angle between the axis of the sensor head and the normal line of the object surface to be greater than 45°
