6. Appendix B – Measuring belt temperature by radiation
The main difficulties in achieving reliable strip temperature measurement inside the oven are :
protection of the sensitive element from stray radiation from the furnace walls;
the influence of emissivity variations on the strip surface.
6.1 Protection against stray radiation
The sensitive element is protected from radiation by a screen tube, cooled internally by circulating water or protective gas, (figure 25 ), the distance between the strip and the screen, d, must be less than D/ 3. (D screen diameter).
The pyrometer optics are focused on the strip.
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Appendix B – Measuring belt temperature by radiation
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