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The paper deals with new non-contact measurement methods of stationary deflections of steam turbines blades under rotation. These methods are based on the properties of highly sensitive and accurate magnetoresistive sensors developed by the authors. Biaxial sensors enable measurements not only in the circumferential, but also in the axial direction, which is essential for the shrouded blades. Proposed...
During their lifetime, power electronic components have to endure several million cycles of thermo-mechanical stress. In this context, the electrical interconnections between the die and the output pins are crucial. Usually, bond wires with diameters ranging from 400 µm to less than 50 µm are used to establish the electrical interconnections. Typically, due to the small diameters, redundant wires...
The aim of this thesis is to determine the horse's gait types using the acceleration values measured from the horse. Measurements were taken at a race track in Gävle, Sweden. A total of five Nanotrak sensors were used, four on the different parts of the horse, and one on the hand of the horse's driver; a car was driven parallel to the horse and the motions of the horse was recorded by a camera in...
Eddy current testing is used to inspect and analyze potential defects in metallic structures that can damage its future usefulness. However, this technique still needs to be improved. In this paper, a probe including one planar coil, one GMR sensor and a tiny permanent magnet is attached to a two dimension positioning system to evaluate a metallic plate with a linear defect. A magnetic field perturbation...
Passive magnetic sensors can measure the magnetic field density in three orthogonal axes and are often integrated on a single chip. These sensors are low-cost sensors and widely used in car navigation as well as in battery powered navigation equipment such as smartphones. There, its general purpose is the measurement of the heading angle by an electronically gimbaled compass technique. We are interested...
In this paper we investigated the opportunities to improve the energy collection of solar chargers with the help of sensors on smartphones. We focused on the information of the ambient light sensor and the accelerometer in order to find suitable positions for solar modules. In particular under indoor environmental conditions, the location and orientation of solar chargers is crucial. If users are...
The offset voltage is an undesirable voltage included at the output of an anisotropic magnetoresistance angle sensor, which affects the accuracy of the angle measurement. This voltage changes with sensor aging and hence should be compensated not just at the moment of manufacturing but also during the sensor lifetime. This can be accomplished by an online offset voltage compensation method. However,...
In Ambient Assisted Living scenarios, elderly people are supported by pervasive and smart environments in their daily mobility and activities, with which they interact by means of a variety of devices and services deployed in the house. These devices, in addition to their particular function, can provide useful context information about the user behavior. In this paper we propose an indoor localization...
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