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Locating the nodes in wireless sensor networks (WSN) is currently a very active area of research due to their increasing number of potential applications. Networks composed of smartphones have gained particular interest, mainly due to the high availability of such devices. This paper presents an algorithm for blind localization of smartphones in a WSN. Data fusion from different embedded sensors is...
Geophysical and geochemical monitoring of volcanic areas have a notable impact for the assessment of the geological instability and for safety of the populations. Nowadays the low cost Micro Electro-Mechanical Systems (MEMS) devices and Wireless Sensor Networks (WSNs) could represent a good way to perform a real-time monitoring task. In this paper a customized wireless multi-sensor architecture is...
In electric vehicles, batteries with many cells are used to supply the high voltages needed for the power train. The battery is controlled by a battery management system (BMS) which needs measurement data from each individual cell. Up to now, wired solutions with specialized measurement controllers for battery modules are in use. Some of these communicate over data bus structures. Our group proposes...
Advancements in sensor and metering technologies enable us to affordably collect more data than ever before and this data can be used to revolutionize the power industry. The ability to sense and monitor power characteristics in near real time and feed this information to control systems operating to optimize the grid enables better operation of both large and small scale power systems. Real-time...
Wireless sensor nodes have a limited power budget, while they are often expected to be functional for a very long period of time once deployed in the field. Therefore, the minimization of energy consumption and energy harvesting technology are key tools for maximization of network lifetime and achieving self sustainability in Wireless Sensor Networks (WSN). This paper proposes an energy aware Adaptive...
In recent years, various United Nations reports have stressed the growing constraint of food supply for Earth's growing human population. Honey bees are a vital part of the food chain as the most important pollinator insect for a wide range of crops. It is clear that protecting the population of honey bees worldwide, as well as enabling them to maximise their productivity, is an important concern...
Chronic incurable wounds comprise a severe problem in diabetics. Their healing is impaired by chronically imbalanced sympathovagal activity of the autonomous nervous system, leading to adverse immune response and reduced microcirculation in the periphery. A targeted modulation of the vagal activity can be reached by percutaneous electrical stimulation of the auricular vagus nerve. The present study...
Blood pressure measurements are associated with paradoxical effects in patients with systolic heart failure. Parameters, which have been associated with increased risk, lie within a normal range in patients with impaired systolic function. This implies that the noninvasive detection of reduced ejection fraction from blood pressure alone is difficult and additional biosignals are needed. A typical...
Clark electrode is a well-known sensor for measuring concentration of dissolved oxygen in a water solution. This type of electrochemical sensor has an advantage of enabling detection of very low oxygen concentration. Although Clark electrode is typically used for measurement of dissolved oxygen, our research showed that the same electrodes can be successfully applied for measurement of other dissolved...
Excessive or poorly timed application of irrigation and fertilizers, coupled with the inherent inefficiency of nutrient uptake by crops result in nutrient fluxes into the water system. The ability to predict nutrient-rich discharges, in real time, can be very valuable to enable reuse mechanisms within farm systems. Wireless Sensor Networks (WSNs) offer an opportunity to monitor environmental systems...
Cooperation between co-located Wireless Sensor Networks (WSNs) has the potential to present new opportunities for novel applications and provide network performance improvements. The traditional interconnection approach for WSNs is based on a backbone network such as the Internet, but this may have intermittent or unavailable connectivity in remote locations. To address this, Opportunistic Direct...
There is an established need to measure soil salinity, and wireless sensor networks offer the potential to achieve this, coupled with a suitable sensor. However, suitable sensors, up until very recently, have not been available. In this paper we report on the fabrication and calibration of a new low-cost, robust, screen-printed sensor for detecting chloride ions. We also report on two experiments...
In this paper, the authors report on the implementation of a simplified and computationally efficient electromagnetic modeling of the interactions that take place between an eddy current imaging device and a metallic assembly, in the context of the non destructive evaluation of defects in metallic parts. The model is implemented in the case of the evaluation of a millimetric defect buried in a three...
The characteristic bio-impedance spectra of a biological sample can provide important information about its cellular structure, and further, infer useful information about the physical and chemical condition of the sample. In this paper, we present the background detail of a magnetic induction spectroscopy system for non-contact bio-impedance measurements, and some results using this system to obtain...
We present an autonomous-mobile gas detection system to assess the measurement of specific gas concentrations in a wide range of outdoor applications. This is especially of interest in those harsh environments where it is impractical or uneconomical to install a fixed array of gas sensors. The system is able to work in potentially hazardous emissions areas — toxic gas leakages — in completely secure...
The magnetic polarization tensor is a frequency-dependent, rotation-invariant and object-specific property of a metallic object. This paper presents an approach to compute the magnetic polarization tensor of a metallic object based on the Boundary Element Method (BEM), which treats the object as a perfect electrical conductor (PEC) and therefore is able to predict the limiting cases where very high...
Advances in animal tracking technology allow for improvement in farm resource management, animal welfare and the possibility of an overall reduction in running costs. We describe a light-weight solar-powered position sensor tag for livestock and a corresponding base station. The livestock ear tag weighs less than 40g and utilises 868MHz SRD/ISM frequency band for telemetry. This provides configurable...
This paper describes a size and tissue absorption based comprehensive approach to optimize a pair of coils for the purpose of wireless powering of brain implanted sensors. In the first step, the optimum transmission frequency is determined by considering tolerable coil size, power transmission efficiency and tissue absorption effects. After modeling the important quantities at the frequency of interest,...
Close proximity hyperspectral and multispectral imaging of crops and soils offers significant potential to optimize sustainable intensification of arable produce and seeds breeding, through the real-time precision management of plant pathogens, viruses and pests and the non-destructive high throughput screening for beneficial crop traits. These opportunities have been recently reported and are the...
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