Temperature control is fundamental for MultiJet Fusion technology and
MetalJet technology. When monitoring temperature using a thermographic
camera (or any other noncontact thermometry technology) it is important to set
the camera emissivity setting to match the optical emissivity of the build material,
otherwise the camera readings will not be correct. In some materials emissivity
may vary from lot to lot and with recycling, it is therefore advantageous to make
the printmode robust to powder emissivity variations. This can be achieved by
controlling the temperature of the top lamps glass via pyrometer measurements.
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INC, HP, "EMISSIVITY ROBUSTNESS THROUGH GLASS TEMPERATURE CONTROL", Technical Disclosure Commons, (November 15, 2021)