Laser Speckle Techniques for in situ Monitoring of Erosion and Redeposition at Inner Walls in Large Experimental Fusion Devices
A method is described which permits nonintrusive 2-dimensional optical measurements of surfaces of inner walls of experimental fusion devices. The technique is based on speckle interferometry. The surfaces to be examined are roughly in the order of the wavelength. In the present feasibility study a multiwavelength continuous wave (CW) laser, a pulsed laser system and a multichannel plate (MCP) intensified charge coupled device (CCD) camera are used. The superposition of image intensities taken at 2 different wavelengths or 2 different angles of incidence gives an adjustable resolution in the um to mm range. First results of reproducible measurements of fusion relevant surfaces are presented.
Bibliographic Reference: Report: IPP 4/271 EN (1995) 33pp.
Availability: Available from Max-Planck-Institut für Plasmaphysik, 85748 Garching bei München (DE)
Record Number: 199610160 / Last updated on: 1996-03-01
Original language: en
Available languages: en