%0 Journal Article %1 Pedrini:19 %A Pedrini, Giancarlo %A Alekseenko, Igor %A Jagannathan, Govindarajan %A Kempenaars, Mark %A Vayakis, George %A Osten, Wolfgang %D 2019 %I OSA %J Appl. Opt. %K 2019 Pedrini ito reviewed %N 5 %P A147--A155 %R 10.1364/AO.58.00A147 %T Feasibility study of digital holography for erosion measurements under extreme environmental conditions inside the International Thermonuclear Experimental Reactor tokamak \invited\ %U http://ao.osa.org/abstract.cfm?URI=ao-58-5-A147 %V 58 %X In the International Thermonuclear Experimental Reactor under construction in southern France, there will be a need for continuous measuring of the erosion at the wall, after the reactor starts operating. A two-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 the shape measurements of objects located at a distance of more than 20 m from the measuring head can be carried out in a short time (100 $\mu$s) by the two-wavelength interferometric technique. A depth accuracy of ±10  $\mu$m is achieved.

@article{Pedrini:19, abstract = {In the International Thermonuclear Experimental Reactor under construction in southern France, there will be a need for continuous measuring of the erosion at the wall, after the reactor starts operating. A two-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 the shape measurements of objects located at a distance of more than 20 m from the measuring head can be carried out in a short time (100 $\mu$s) by the two-wavelength interferometric technique. A depth accuracy of {\textpm}10  $\mu$m is achieved.}, added-at = {2021-01-27T16:42:33.000+0100}, author = {Pedrini, Giancarlo and Alekseenko, Igor and Jagannathan, Govindarajan and Kempenaars, Mark and Vayakis, George and Osten, Wolfgang}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/2009506ac1a2b0af2a9f95731d9b479ae/steinbeisser}, doi = {10.1364/AO.58.00A147}, interhash = {602e2145b6f09cb642aad11f8c3f2d27}, intrahash = {009506ac1a2b0af2a9f95731d9b479ae}, journal = {Appl. Opt.}, keywords = {2019 Pedrini ito reviewed}, month = feb, number = 5, pages = {A147--A155}, publisher = {OSA}, timestamp = {2021-01-27T16:27:21.000+0100}, title = {Feasibility study of digital holography for erosion measurements under extreme environmental conditions inside the International Thermonuclear Experimental Reactor tokamak \[invited\]}, url = {http://ao.osa.org/abstract.cfm?URI=ao-58-5-A147}, volume = 58, year = 2019 }