The International Thermonuclear Experimental Reactor (ITER) Project is the next step in the transition from experimental studies of plasma physics to full-scale electricity-producing fusion power stations. There is a need for the regular measuring of the erosion and deposition at the wall once the reactor starts operating. An erosion and deposition monitor able to measure the changes in the surface shape is planned. We have shown that long distance shape measurements in challenging environmental conditions (strong vibrations) can be done by two-wavelength digital holography and thus this technique could be used for the erosion monitoring inside the ITER-Tokamak.
In the International Thermonuclear Experimental Reactor (ITER) Project, under construction in southern France, there will be a need for continually measuring the erosion at the wall, after the machine starts operating. A multiple wavelength interferometric technique based on digital holography is proposed for the erosion measurement. This technique has the ability to tackle the challenging environmental conditions within the reactor by a long distance measurement, where a relay optic will be used for imaging the investigated surface on the detector. We will show that shape measurements of objects located at a distance of more than 13 m from the measuring head can be carried out by the multiple wavelength interferometric technique. A depth accuracy of ±10 μm is achieved.
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