The thermal camera is a critical component of some 3D printers, hence it must always be well
calibrated. This calibration has two aspects to it: 1) thermal reading accuracy (thermal
calibration) and 2) geometrical positioning accuracy (optical calibration).
Current solutions for optical calibrations are based on printing FA or DA spots (we call these
processes “thermal camera printing calibration” and “thermal camera startup calibration”,
respectively), which consume time, build material and fluids. The thermal check is done using the
“Thermocamera Verification Test”, which is based on using a rectangular target located on the
carriage surface and heating it using one of the top lamps.
In this disclosure we propose a method to calibrate the thermal camera both optically and
thermally using thermal markers whose position and temperature are known with precision. The
use of dedicated HW allows performing the calibration during printing and consumes neither
build material nor fluids nor warm-up time.
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INC, HP, "THERMAL CAMERA CALIBRATION USING BUILT-IN CALIBRATION MARKERS FOR CONTINUOUS CALIBRATION", Technical Disclosure Commons, (May 01, 2020)