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April 16, 2013
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April 16, 2013
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April 16, 2013
Abstract
This paper describes the physics of new camera-based imaging methods for silicon solar cell characterization. The development aims at quantifying the images with respect to physical properties like current, voltage, resistance, and power. This improves the informative value and the comparability of results — at least in the limits of the sometimes simplified models. Selected examples show that the methods provide valuable information for industrial production control and enable new insight into fundamental effects of solar cell and semiconductor physics.
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April 16, 2013
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The position accuracy in autonomous inertial navigation systems (INS) can be increased with zero-velocity updates (ZUPT) significantly, if the motion state is known. If the sensor signals are weak, however, especially during an uniform movement without acceleration or deceleration, the sensor signal is covered up by the sensor noise, and the determination of the motion state becomes a challenging task. Therefore, in this article various probability tests are comprehensively evaluated with simple but typical measurement setups.
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Identification and compensation of deviations between the virtual planning and the real implementation pose challenges for the commissioning of production processes. The deviations can be visualized and thereby compensated by global reference systems. This paper describes the integration of local sensors and their data into global reference systems by means of a flexible optical light section sensor consisting of multiple cameras and a multi-line laser projector as an example.
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Fiber Bragg gratings (FBGs) can be used as optical temperature and strain sensors inscribed into the core of an optical fiber [1]. In certain applications, FBGs offer benefits compared to conventional, electrical sensors [2]. These advantages, however, go along with the significant effort to convert the measurement result from the optical to the electrical domain. Furthermore, the influence of cross sensitivity (either temperature or strain) usually have to be cancelled out. This paper proposes a simplified setup that enables temperature- or strain-compensated measurements based on fiber Bragg grating sensors with reduced complexity. The principle was tested in simulation as well as in experiment.
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