Excitation signals are crucial in defining the duration and quality of the final impedance spectrum measurement. Conventionally, impedance spectroscopy is carried out using a sine frequency sweep or a multisine. Howev...
Excitation signals are crucial in defining the duration and quality of the final impedance spectrum measurement. Conventionally, impedance spectroscopy is carried out using a sine frequency sweep or a multisine. However, for measurement systems where only a binary excitation is possible, such as online DC/DC converters, the choice of the excitation signals becomes very limited. This paper compares several binary excitation sequences for Li-ion battery diagnosis and different binarization methods of multisine. It is shown that impedance spectra based on Multifrequency Binary Sequences (MBS) optimized by Evolutionary Role Playing Game Theory crest factor optimization method and based on Sign or $\Delta\Sigma$ modulation outperform those made using PRBS or chirp signal, owing to their 14x higher SNR. Linear Kramers Kronig was used to check the deviation, showing that MBS-Sign has an RMS deviation of 53.69 ppm, followed by MBS $A\Sigma$ at 89.39ppm, then MBS PWM at 145.41 ppm, then signum chirp at 0.51 % and finally PRBS at 1.51 %. Therefore MBS based on sign, whose result is very comparable to multisine's, is recommended for Li-ion battery diagnosis
Sensing of natural ice accretion comprises the detection of the start of an icing event and the measurement of the thickness of a grown ice layer. In this work we present a combined capacitive and impedance spectrosco...
Sensing of natural ice accretion comprises the detection of the start of an icing event and the measurement of the thickness of a grown ice layer. In this work we present a combined capacitive and impedance spectroscopic sensing approach for ice detection and thickness measurement. We show the realization of a small sized inter digitated electrode sensor for ice detection and discuss the sensing effects and propose a detector based on a phase evaluation scheme using off-the-shelf measurement ICs. For ice thickness measurement we demonstrate the design of sensors with a good linearity behavior with respect to the ice thickness.
Displacement measurement systems based on acceleration sensors provide an interesting sensing approach for vibration monitoring. Hereby the displacement is computed by a double integration of the acceleration signals....
Displacement measurement systems based on acceleration sensors provide an interesting sensing approach for vibration monitoring. Hereby the displacement is computed by a double integration of the acceleration signals. The main challenge hereby are offset signals in the acceleration signal. Hence a lower cutoff frequency has to be determined for this sensing principle. However, not only DC components in the acceleration signal have to be considered, but also the measurement noise in the acceleration signal has to be taken into account. In this work we present a noise and uncertainty analysis for accelerometer based displacement measurement using a MEMS based sensor. We hereby investigate time domain and frequency domain displacement measurements. Theoretical results and comparative numerical studies are presented.
Impedance spectroscopy is essential for diagnosing electrochemical systems such as Li-ion batteries, often requiring sinking-sourcing hardware. However, such hardware often generates high power consumption and heat lo...
Impedance spectroscopy is essential for diagnosing electrochemical systems such as Li-ion batteries, often requiring sinking-sourcing hardware. However, such hardware often generates high power consumption and heat loss, posing safety problems. Moreover, applying impedance spectroscopy to split hardware, i.e., sinking (discharging) and source (charging) dedicated hardware, results in less heat generation but an unstable measurement. This paper defines a binary excitation sequence and double phase impedance measurement that allow the measurement of a Li-ion battery's stable zero-charge impedance spectrum based on a split-hardware. The zero-charge stable impedance measurements can be extracted by designing an excitation binary signal with a slight bias current that allows impedance spectroscopy during charge and discharge, which is then averaged. The conditions for the signal design are detailed in this paper. Furthermore, the proposed method has been applied to a Li-ion battery cell and has returned a maximum impedance measurement deviation of ± 0.3% ∠± 12%.
The use of Multiwalled carbon nanotubes (MWCNTs) as surface modification material for electrochemical sensors is gaining importance. Thereby, the performance of the MWCNT modified sensors is dependent on the preparati...
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The accurate registration of Sentinel-2 optical images with Sentinel-1 synthetic aperture radar (SAR) images plays a critical role in remote sensing applications such as disaster management, environmental monitoring a...
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The application of eddy current displacement sensors (ECDSs) for monitoring industrial processes has been studied. Industrial processes often present challenges due to harsh operating conditions. For example, sensors ...
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ISBN:
(数字)9798350363517
ISBN:
(纸本)9798350363524
The application of eddy current displacement sensors (ECDSs) for monitoring industrial processes has been studied. Industrial processes often present challenges due to harsh operating conditions. For example, sensors can be affected by high temperatures, dirt, dust, and humidity. These effects cause significant deviations in the measurement signal, necessitating the development of robust sensors. In this study, we present an approach for designing an ECDS suitable for high temperature environments with high temperature variations and varying humidity levels. Our approach addresses various aspects, including the selection of former materials, suitable winding techniques, and measurement frequencies, to develop a sensor system capable of accurately measuring large distances in such environments. We present lab measurements showing the feasibility of the proposed approach. The results provide a basis for reliable position measurement with ECDS in harsh environments.
A dual-fibre single-plane angle-sensing tape that utilizes optical Fibre Segment Interferometry and Range-Resolved Interferometry (RRI) for angle sensing is presented. The sensing tape facilitates the multiplexing of ...
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A multiplexed array of optical fibre based angle sensors for deployment on multiple joints of a robotic arm is demonstrated. Two optical fibres, each containing an array of fibre segment interferometers, are bonded ei...
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This paper presents traceable measurements of bending stiffness for standard optical SMF-28 fiber. Stiffness values were derived from force-displacement measurements, performed in a setup specifically designed for the...
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