How to measure the emissivity of plastic disc on which thin film of metal has been coated to reduce the emissivity?

08 August 2019 1 7K Report

Plastic disc on which thin film of metal has been coated to reduce the emissivity. Now we waent to measure the actual emissivity of coatd sample.

Thanks in advance.

Yang Li

If I understand correctly, you want to measure the emissivity of the plastic disc with metallic thin film at room temperature. You can use a FTIR spectrometer to measure the reflectance spectrum (R) of the sample, and then you can get the absorptance (A) from A=1-R-T, where transmission should be zero due to the thick structure. According to the Kirchhoff's Law, the emittance at a certain wavelength is equal to the absorptance at that wavelengths. Then you can get the emittance.

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