Der Beitrag untersucht die Eignung des Wirbelstromverfahrens zum Nachweis interkristalliner Korrosion in Nickelbasislegierungen. Nach einer kurzen Einführung in den Schädigungsprozess und seine Folgen werden Modellberechungen zur Wirbelstromausbreitung vorgestellt. Die anschließenden experimentellen Untersuchungen bestätigen die Eignung des Wirbelstromverfahrens zum Schädigungsnachweis und liefern Anhaltspunkte für quantitative Aussagen.
Using phase Doppler anemometry (PDA) to investigate sprays of optically inhomogeneous liquids leads to blurred measured size distributions. The blurring function is formed by performance of PDA measurements on single-size droplets generated by a piezoelectric droplet generator. To obtain the undistorted droplet-size distributions, a constrained iterative inversion algorithm is applied. The number of iteration steps to achieve the best possible restoration is determined by the use of synthetically generated data that has noise properties similar to the measured histograms. The obtained size distributions are checked by comparison with undistorted measurement results of an atomized optical homogeneous liquid.
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