Thomas Bretterklieber

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This paper presents a simple and efficient seat occupancy detection scheme based on a capacitive sensing principle. Parameters such as presence, position and type of seat occupant are essential for successful air bag control in vehicles. In the absence of such information, on an accident, the air bag may be inflated to a vacant seat leading to its wastage(More)
For electric power transmission, high-voltage overhead power lines play an important role, as the costs for power transmission are comparatively low. However, the sag of the conductors (e.g., due to temperature variations, aging, or icing of conductors as a result of extreme weather conditions) may increase safety margins and limit the operability of these(More)
Low-depth modulation capacitive sensors, i.e. sensors where the capacitance variations caused by a measurand are only a small fraction of the total capacitance, are frequently encountered in measurement problems. Furthermore, also a conductance (e.g. due to parasitic conductive staining) between the sensor electrodes may affect the capacitance evaluation.(More)
This paper focuses on problems which arise when both a power-harvesting system based on a capacitive principle and a capacitive measurement device [i.e., a capacitance-to-digital converter (CDC)] are used in one electronic system to build up an autonomous measurement device for icing detection on a high-voltage overhead power line. The overall capacitance(More)
Passive or semiactive wireless sensors, i.e., sensors that require neither wires nor external power supply/batteries, are attractive for many measurement problems. Standard approaches based on Radio Frequency Identification technology usually have difficulties when a fairly conductive matter such as steel or a large amount of water is in the vicinity of the(More)
Passive wireless sensors, i.e. sensors that do neither require wires nor external power supply/batteries, are attractive for many measurement problems. Standard approaches based on radio frequency identification technology usually have difficulties when fairly conductive matter such as steel or large amount of water is in the vicinity of the devices. This(More)
This paper presents a simple yet efficient seat occupancy detection scheme based on a capacitive sensing principle. Parameters such as the presence, position, and type of the occupant of the seat are essential for successful air-bag control in vehicles. Without this information, during a collision, the air bag may be inflated to an empty seat (ES), wasting(More)
For electric power transmission, high voltage overhead power lines play an important role as the costs for power transmission are comparatively low. However, the environmental conditions in many geographical regions can change over a wide range. Due to the high voltages, adequate distances between the conductors and objects in the environment have to be(More)
This paper presents a capacitive proximity sensor that helps to improve the personal safety features of a chainsaw. Even though chainsaws are equipped with safety features such as kickback protection and chain brakes, related accidents reported each year are huge in number. Safety can be enhanced to a high degree, by integrating human proximity sensing(More)