Endogeneous electric fields (EFs) affect a wide range of cellular functions such as migration, wound healing and regeneration. Similar results were observed when external EFs are applied. To date, the phenomenon of electrotaxis has been studied only in homogeneous EF environments. Here, we report on the construction and fabrication of a microfluidic biochip as well as first results for stimulation of cells with stationary, non-homogeneous EFs.

The presented work gives insight into the behaviour of co-resonantly coupled oscillating cantilever beams by means of electro-mechanical analogies. An electric circuit model is analysed with various stages of complexity, and conclusions are drawn regarding the applicability of the co-resonant concept for sensors. Furthermore, this is validated by a comparison between the theoretical predictions and experimental data.

Imaging astronomy spectrographs are designed for recording thousands of spatially resolved spectra of a two-dimensional image field within one single exposure. Transferring this technology to imaging Raman spectroscopy allows a considerably faster acquisition of chemical maps. Within the scope of a research project, this method is refined for medical diagnostics, e.g., the identification of potentially cancerous abnormalities of skin tissue.

We have developed a preparation technique to form graphite/TiO₂/Ti and platinum-graphite/TiO₂/Ti solid-state sensors based on plasma electrolytic oxidation (PEO) of titanium foils, whereby a porous titanium oxide layer is formed with well-defined phase composition and a reproducible microstructure. A printing method is used to deposit graphite or catalytically active graphite-platinum electrodes. Our design enables the application of many different detection principles such as calorimetry.

This paper addresses the development of flow sensors optimised for heating, ventilating, and air conditioning systems. The sensors are based on the printed circuit board technology facilitating robust, flexible (in terms of layout), and cost-effective devices. Two approaches for measuring fluid quantities are investigated in this context and several sensor embodiments were investigated and fabricated. After experimental characterisation, measurement and simulation results were compared.

A simulation model to predict system behaviour of photoacoustic CO₂ sensors is presented. The sensor output signal that depends on the CO₂ concentration can be simulated if the boundary conditions of the system are known. A comparison of simulated values with experimental results is made. There is good accordance between simulation and experiments. Photoacoustic gas sensors offer great potential for miniaturized gas sensors. The simulation model is an effective tool for further developments.

This study aimed to explore the potential of a multi-sensor system for assessment of biomass in pastures under different grazing intensities. Prediction accuracy with a mobile application of sensors was always lower than when sensors were applied statically. However accuracy of biomass prediction improved with increasing grazing intensity. Although the limitations associated with the system especially in very lenient pastures, the finding opens up a perspective for future grazing management.

Hyperspectral imaging (HSI) has the potential to add a beneficial tool for the assessment of transplanted organs. Camera-based technologies such as HSI allow the fast and noninvasive monitoring of relevant physiological parameters. The correlation of HSI-based parameters with functional kidney parameters may be useful for the evaluation of the acceptability of marginal organs, thereby addressing the society-related problem of the shortage of available organs for transplantation.

Strategic considerations and publications dealing with the future of industrial production are significantly influenced these days by the concept of "Industrie 4.0". For this reason the field of measurement technology for industrial production must also tackle this concept when thinking about future trends and challenges in metrology.

This paper presents a novel method for the detection of sensor defects. Here, the consistency between measurements of sensor groups are utilized for this method. The sensor groups are pre-determined by the structure of an existing sensor fusion algorithm, which is in turn used to determine the health of a monitored system (e.g. a machine). Defect detection results of the presented method for different test cases and the method's capability to detect a number of typical sensor defects are shown.

The article shows that indoor navigation can be resolved on the basis of improved magnetic tracking. A theory of indoor navigation based on magnetic positioning is proposed. The functioning of the local system was confirmed experimentally. The author is goes on to continue this work as a full-scale experiment to validate the proposed technique. The work is part of the doctoral thesis of the author. All work is executed by the author on his own initiative alone, at his own expense.

The paper shows how the precise knowledge of the sound field of an ultrasonic annular array can contribute to the development of novel measurement techniques. It demonstrates the locally resolved measurement of sound velocity in fluids, simultaneous measurement of thickness, sound velocity of layers and curvature. To demonstrate the methods, the principles as well as results of simulations and measurements are discussed.

An FEM model is used to improve the sensor design of a Tian–Calvet calorimeter. By modifying the basic part of the sensor (a sensor disc based on low temperature co-fired ceramics), the sensitivity was increased by a factor of 3. The model was validated and the sensors were calibrated. Indium and tin samples were measured. The melting temperatures show a deviation of 0.2 K while the enthalpy was measured with a precision better than 1 %. The values for tin deviate by less than 2 % from literature.

Measurement of electrical current is important for many scientific and industrial applications. Often shunt resistors are used. However, thermal effects due to self-heating and ambient temperature variation limit the achievable accuracy. In this work, a dynamic compensation method is presented which takes static and dynamic temperature drift effects into account. It significantly reduces the remaining measurement errors. The approach can also be used to improve existing measurement systems.

Electromagnetic coils are ubiquitously used in the modern world in motors, electronic components, inductive sensors, etc. In many applications (magnetic sensor calibration and nuclear magnetic resonance imaging (NMRI)) there is a strong need for a homogeneous magnetic field. We propose a simple analytic modelling allowing determination of the electrical conductor distribution to make it homogeneous. The method brings the perspective of new homogeneous magnetic calibration and NMRI coils.

This paper presents a new wearable gesture interface which is intuitive, fast, accurate, and convenient with MEMS sensors and ZigBee independent of cameras, sensor bars, and surfaces in a broader interactive range. This kind of spatial interaction tool can help more people to express anything through gesture movement. Current gesture interaction mainly works on recognition, while our product applies novel and systematic calculation and realizes more flexible and accurate gesture interaction.

To promote WSNs for IoT, energy consumption must be reduced to enable more applications. The power need by a sensor node is governed by the radio component. A wake-up receiver is an ultra-low-power radio receiver. It serves for idle listening whilst leaving the node in sleep state. The main research focus of WuRxs is to reduce energy usage and to improve sensitivity. In this work, active components are carefully used to construct a 7.5 µW WuRx with −60 dBm sensitivity and a latency of 10 ms.

We present a new technique which can be used in devices measuring the viscosity of a liquid. To this end, a steel ball is submerged in the liquid and levitated by magnetic forces. The ball's position is measured and controlled to keep the ball in a stable levitated position. The ball is then actuated to perform a circular motion through the liquid. This motion is measured and can be used to draw conclusions about the liquid's viscosity.