A composite dish segment was damaged in a maintenance accident. A surface measurement was needed in order to verify that the surface was ok to operate as usual. The customer wanted to know how far the damage propagated to the rest of the surface, and wanted to set a threshold at 20 micron RMS.
A Fringe Metrology measurement determined the size of the damaged area and the effect on the entire panel.
A Fringe Metrology system was used to measure the surface on an optical table.
The measurement contains over 1 million sample points, and clearly shows the damage location
It was determined that the damage was isolated to within a couple inches of the edge. The customer was able to mask that area of the panel, and successfully reinstall it onto the main dish.