Some 3D printing technology is based on selective powder material fusion. In terms of temperature, this
fusing process is developed in two different stages.
In a first stage a subsystem called top heating is responsible for maintaining a homogeneous
temperature over the whole print bed, this temperature is close to the powder material fusing
temperature. On this stage current implementations use infrared sensor cameras to provide feedback to
the lamp controller trying to meet required irradiance level.
In a second stage a subsystem called fusing lamps attached to the printing carriage rise temperature to
the melting point on printed areas. On current implementations for this second stage there is not
feedback during fusing process. Lamps are previously calibrated using external tools and complex
processes; and there is no option on printer to adjust irradiation after calibration process.
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INC, HP, "MEASURING IRRADIANCE ON A PRINT BED", Technical Disclosure Commons, (July 24, 2018)