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Experimental setup for the temperature measurement of the carbon fibre flatbed insert using the Bragg-grating thermometry system. The locations of the optical fibre probes are also shown. Two probes (Probes 1 and 3) are located in the axial imaging slice with Probe 1 inserted in the centre of the anterior plane, while three probes (Probes 2–4) are placed as close as possible to the bed with Probe 2 inserted in the left plane and probes (Probes 3 and 4) inserted in the right plane.
