3D Multifusion 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 in charge of maintaining a homogeneous temperature
over the whole print bed, temperature should be held close to the powder material fusing threshold. To
achieve this infrared sensor cameras may be used to provide feedback to the lamp controller trying to
meet required irradiance level.
In a second stage after selectively applying fusing agents over the new layer a subsystem called fusing
lamps attached to the printing carriage raise the temperature to the melting point on printed areas. This
process is currently done in open loop without temperature feedback. Lamps are previously calibrated
using external tools and complex processes; and there is no option while printing to adjust irradiation.
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INC, HP, "ACHIEVING HIGHER RESOLUTION WITH THERMAL SENSORS", Technical Disclosure Commons, (August 09, 2018)