That said, it is very important to know the emissivity of the targeted object or material that we are measuring, to obtain an accurate temperature reading using thermal imagers. Most thermal imagers in the market today do come with a pre-defined emissivity table for common items that can be found around us.
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Figure 1: Emissivity table found in U5855A TrueIR thermal imager |
- Clean up the surface of the targeted object to remove dusts or foreign materials.
- Apply blackbody paint or electrical tape with known emissivity on the surface of the targeted object. See Figure 2.
- If the targeted object is radiating heat, do allow some time for the surface of blackbody paint or tape to reach equilibrium with the targeted object.
- Perform the reflected temperature calibration (RT cal) and set the known emissivity (Ɛ) value of the blackbody paint or tape on your thermal imager. Measure the temperature of area (A) whereby the blackbody paint or tape was applied. Ensure the thermal imager is focused correctly and perpendicular to the targeted object to minimize emittance effect. Record the average temperature of that focused area.
- Measure the temperature of area (B) as shown in Figure 2. Manually lower the emissivity (Ɛ) value on the thermal imager until the temperature of area (B) is equal to the temperature measured at area (A). The emissivity reading indicated now will be the emissivity value of the targeted object.
Figure 2: Object with unknown emissivity |
Figure 3: IR image of a three-phase circuit breaker taken using U5855A TrueIR thermal imager |
There are advantages and disadvantages to both qualitative and quantitative measurements, depending on whether or not further statistical analysis is needed or just a need to know the general feel of how the target object is.
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