Development of calibration method for divertor IR thermography in ITER

Takeuchi, Masaki; Sugie, Tatsuo; Takeyama, Shigeharu; Ogawa, Hiroaki; Itami, Kiyoshi

In ITER, divertor IR thermography for measurement of surface temperature on divertor plates (200-3600C) with high resolutions in both time (20 ms) and space (3 mm) has been designed by Japan. Calibration of emissivity on the divertor plates is important, because emissivity will change due to changes in surface properties caused by depositions and erosions. Therefore, laboratory experiments for development of calibration methods have been performed by using IR instruments. The calibration of the IR camera was performed by the plane black body in the temperature of 100-600C. The radiances of the tungsten heated by 280C were measured by the IR camera without filter (2.5-5.1 um) and with filter (2.95um, 4.67um). The preliminary data of the scattered light of the laser of 3.34 mm that injected into the tungsten were acquired.