This paper addresses indoor localization using an anchor-based system based on Bluetooth Low Energy (BLE) 5.0 technology, adopting the Received Signal Strength Indicator (RSSI) for distance estimation. Different solutions have been proposed in scientific literature to improve performance of this but a detailed comparison these is still missing. The aim work make experimental analysis combining different improvement BLE-based localization, identifying most effective one. considered involve...

Nondestructive testing techniques for the diagnosis of defects in solid materials can follow three steps, i.e., detection, location, and characterization. The solutions currently on market allow good detection location defects, but their characterization terms exact determination defect shape dimensions is still an open question. This paper proposes a method reliable estimation crack conductive using suitable nondestructive instrument based eddy current principle machine learning system...

In many industrial application fields as manufacturing, quality control, and so on, it is very important to highlight, locate, characterize the presence of thin defects (cracks) in conductive materials. The characterization phase tries determine geometrical characteristics defect namely length, width, height, depth. analysis these allows user accepting or discarding realized components tuning improving production chain. authors have engaged this line research with particular reference...

In a smart grid (SG) scenario, accurate and realtime information about key parameters (such as voltage current in each node of the net) are strategic requirements. order to grant best tradeoff between measurement accuracy economic sustainability SG distributed measurements, design development suitable lowcost current/voltage sensors required. To this aim, paper proposes three-phase contactless sensor based on anisotropic magnetoresistance effect. A placement strategy is used compensate...

Eddy current testing (ECT) has three main tasks: detection, location, and characterization of defects. The task, which means the ability to find geometrical characteristics defect, is still in research domain, although many industrial applications this task be carried out with good accuracy allow reliable acceptance or rejection decision indispensable save costs even human lives. This paper proposes an ECT measurement method that allows estimation thin defects (i.e., length, height, depth)...

This paper proposes a novel instrument for eddy-current (EC) nondestructive testing on conductive materials. The is composed by smart EC probe, based GMR sensor, and suitable processing unit. key features of the proposed are capability detecting, locating, characterizing thin defects as superficial subsuperficial cracks. main goal proposal realization very low cost that able to reach performance comparable with instrumentation available market especially suited application fields such...

The development of eddy current nondestructive techniques and instruments is moving toward new challenges in detecting buried smaller defects minimizing the amplitude excitation currents. size detected defect, greater diagnostic capability these techniques. Moreover, lower required, longer battery discharge time portable instruments, possibility implementing broadband strategies with reliable results. This feature also important when array probes have to operate for a large amount time....

In this paper, we present a fast method for classification of defects detected by eddy current testing (ECT). This is done using derived lab experiments. For any defect, the ECT magnetic field response different EC-probe's paths represented on complex plane to obtain Lissajous' figures. Their shapes are described through use few geometrical parameters forming feature vector. Such vectors used as signatures probe at crossing angles and distances from defect. The effectiveness proposed...

Thickness measurements of metallic plates are mandatory in many industrial scenarios. Methods based on Eddy Current Testing (ECT) ideal for fast and accurate online contact–less thickness measurements, making them very attractive the Industry 4.0 scenario. This contribution is focused a specific robust ECT technique proposed past by scientific community. The main limitation its applicability to thin materials only, where material much smaller than overall size probe. Extending range thicker...

This contribution focuses on the nondestructive evaluation of thickness metallic plates, by means eddy current testing. Specifically, we present a method for reducing/optimizing measurement time approach presented in [8], while keeping high accuracy suitable industrial applications. In [8] key feature estimating plates is value frequency where proper quantity achieves its minimum value. To get measuring plate, this needs to be located an accurate manner. turns, requires "many" measurements...

Localizing objects in indoor environments with anchor–based systems poses several challenges to be faced. The main one is the design phase. What minimum number of anchors adopted? optimal placement operating domain? These are typical issues that needs solved this stage. Such issue generally addressed by experimental tests, imposing high costs both required large amounts time and use devices. In addition, sometimes experiments will not warrant identify solution. work, a black–box tool...

The paper introduces a novel 4-coils probe designed for Eddy Current Non-Destructive Testing on conductive materials. key innovation lies in its capability to identify small surface and subsurface cracks regardless of their orientation. This is achieved through suitable developed using two pairs exciting coils that allow generate orthogonal magnetic fields. Using excitation currents with an amplitude modulation approach, rotation the eddy induced sample obtained. approach ensures effective...

Giant magnetoresistance (GMR) sensors are assumed as an important role in magnetic field sensing applications because of their small size, high sensitivity, large frequency response, low power consumption, and relatively cost. In all these applications, it is very to estimate possibly reduce the measurement uncertainty related use sensors. this paper, metrological characterization GMR magnetometers highlights contributions hysteresis, nonlinearity, operating temperature. Starting from...

The need of large-scale monitoring power quality (PQ) in electrical systems require the design reliable and cost-effective measurement instruments. In this framework, Field Programmable Gate Array (FPGA) architectures seem to offer valid solutions since they allow powerful algorithms be implemented on low-cost hardware with reconfigurable firmware. This paper proposes a FPGA-based instrument for harmonic interharmonic compliance most important PQ standards. Key feature proposed is very low...

In the framework of Eddy Current Testing (ECT), this work presents an automated non-destructive testing method based on Currents which uses few geometric features low definition Lissajous figures. A vector representing shape ECT magnetic field response represented in complex plane is used as signature to recognize specific defects aerospace structures. order evaluate proposed method, accuracy, specificity, sensitivity, precision, F-Measure, AUC, and Matthews correlation coefficient are rate...

Wearable health sensing devices are crucial and the development of multi-sensing textiles for non-invasive continuous long-term biosignal monitoring is primary interest. Nowadays, different wearable sensors available but they usually lack comfort use during normal daily life activities. In this study, new graphene-based flexible dry electrodes investigated to overcome limitations currently electrodes. Briefly, realized through casting PVDF (polyvinylidene fluoride)/GNP (graphene...

Nowadays, an increasing concern about people and environmental health safety is spreading all over the world, technologies such as efficient monitoring systems are furthered. In field of air quality, filtering systems, especially based on activated carbons (ACs), commonly used. most cases, their state not monitored, time life statistical a priori evaluations. This paper proposes novel microsensor platform for real-time AC filters impedance measurements during gas exposition. A metrological...

The paper proposes the use of a suitable multi-frequency approach applied to novel instrument for eddy current non-destructive testing on conductive materials. is composed by smart probe, based Giant Magneto Resis

Magnetic localization is used in many indoor positioning applications, such as industrial, medical, and IoT, for its benefits related to the absence of line sight needs, multipath fading, low cost transmitters receivers, simple development setups made coils magnetic sensors. In short-range this technology could bring some advantages with respect ultrasound, laser, or RF ones. Nevertheless, fixed both desired accuracy energy constraints, optimal design a system based on measurement depends...