A nonintrusive optical model displacement monitoring system ispresented, which was primarily developed for wind tunnel modelmonitoring purposes. To solve the described problem an optical systemhas been developed which basically focuses the model, or part of it,onto an image plane where a line sensor is placed, utilising fourindependent line CCD sensors with a data rate of 6.4 kHz. To evaluatethe data from the line sensors digital image processing is used totransform the data from the sensor frame of reference to the wind tunnelco-ordinate system leading to the actual model position within the windtunnel frame of reference. The spatial resolution of the system isbetter than 0.3 %. The position monitoring system has been successfullyapplied in the DNW-TWG. The position of a delta wing model has beendetermined by means of the newly developed optical position monitoringsystem of DLR. It was possible to determine the displacement due to meanloads and the transient motion of the model for different Mach numbers,different rolling rates and angles of attack up to 25°
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