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Eddy current testing is well established for non-destructive testing of electrical conductive materials. The development of radio frequency (RF) eddy current technology with frequency ranges up to 100 MHz made it possible to extend the classical fields of application even towards less conductive materials like CFRP. It turns out that RF eddy current technology on CFRP generates a growing number of...
By launching new processes introduced by nano science into much more conventional industrial applications fast, robust and economical reasonable inspection methods are required for process control and quality assurance. Due to the complexity of processes e.g. for thin film coatings or nano engineered materials, variations of material parameters like microstructures, grain boundary conditions, particle...
The challenge of nano packaging requires new non-destructive evaluation (NDE) techniques to detect and characterize very small defects like transportation phenomenon, Kirkendall voids or micro cracks. Imaging technologies with resolutions in the submicron range are the desire. Possible evaluation methods are for example x-ray microscopy, x-ray tomography, ultrasonic microscopy and thermal microscopy...
Piezoelectric 1-3 composite material sensors are used in phased array ultrasonic testing systems. The Dice-and-Fill technique is a very flexible method to fabricate these materials for frequencies up to 10 MHz. A polarized PZT plate is cut in two directions with a dicing saw to separate the PZT pillars. The pitch of the microstructure has to be finer with increasing center frequency to suppress spurious...
The challenge of nano packaging requires new non-destructive evaluation (NDE) techniques to detect and characterize very small defects like Kirkendall voids or micro cracks. Imaging technologies with resolutions in the sub-micron range are desired. Possible evaluation methods are for example x-ray microscopy, x-ray tomography, ultrasonic microscopy and thermal microscopy. However, techniques with...
There is an increasing demand to control electrical drives- with revolving or linear motors as well- with minimized jerk during dynamic operation modes. Jerk is defined by the third deviation of way above time. To avoid- or better to decrease - jerk during acceleration and deceleration periods means a loss of acceleration which must be compensated in that periods of the time-way diagram in which the...
While most NTSC color television receivers built to date have used the three-gun tricolor tube, experimentation with other displays has continued. This paper discusses some aspects of a four-gun four-color tube of the aperture mask type: possibility of minimizing the effect of convergence and other raster deficiencies of the three-gun tube, video circuitry, implications with respect to system amplitude...
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