The quality of the injection holes, which have a diameter of approx. 100 µm and a length of approx. 1 mm, is decisive for the quality of the injection process. The main things to measure are the diameters of the injection holes and their position and angular position relative to the reference axis of the nozzle. The small tolerances of a few micrometres lead to very high demands on the measurement uncertainty, yet short measurement times are required. Because of the very small diameters of the injection holes, they cannot be measured with conventional electro-mechanical styluses.
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