Adam Cichy, Artur Skórkowski, Sebastian Barwinek
A basic purpose of this research was to verify a possibility of automatic balancing in the virtual realization of a quasi-balanced circuit for capacitance measurements. The diagrams of a virtual quasi-balanced instrument are presented in this paper. The tested circuit was built using a PC computer and the DAQ card NI-6009. The DAQ card and the calculation were controlled by the application developed in the graphical development platform LabVIEW.
TC4 Symposium 2013
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· 2013
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Dean Jarrett, Miles Owen
Described here are the configurations and procedures used to provide traceability to electrical standards for an aerosol electrometer calibration in the range ± 20 fA to ± 40 fA. The technique used here simulated the condition of a current induced when charged particles would flow into the aerosol electrometer’s Faraday-cup by replacing the charged particle flow with known source currents. The technique used here was to source known currents over a wider range of ± 1 pA, in addition to the ± 20 fA to ± 40 fA, and subtract the offset (i.e. zero) current measured when charged particles are not...
TC4 Symposium 2013
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Adam Cichy, Artur Skórkowski, Sebastian Barwinek
A principle of operation and an implementation of a non – bridge quasi - balanced circuit designed to measure quality factor of real inductors has been presented in this paper. The circuit is based on well-known bridge circuit. A structural diagram describing the processing of signals has been presented. An implementation as a virtual instrument has been presented as well.
TC4 Symposium 2013
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José Santos, Pedro M. Ramos
This paper presents a method to estimate the impedance response of a vibrating wire viscosity sensor. The method is based on the application of a multi-harmonic signal at the terminals of the sensor. The signal is composed by the harmonics that correspond to the frequencies at which one wants to obtain the impedance of the sensor. The impedance is determined using least-squares (LS) multi-harmonic fitting algorithms to estimate the amplitudes and phases of the harmonics of the impedance current and voltage. The measurement and estimation procedure is performed by a dedicated developed...
TC4 Symposium 2013
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Cristina Schreiner, Theodora Krasia-Christoforou, Cristina Bratescu, Ramona Burlacu, Maria Demetriou, Ioanna Savva, Romeo Ciobanu
A new concept of hybrid nano-biosensors was developed based on well-defined methacrylic diblock copolymers and metal nanoparticles (Au and Pd). The nano-composite systems were used as surfactant for modified carbon electrodes. The electrochemical characterization (Potentiostat/Galvanostat method) was performed by using reference redox molecules in order to test the sensors sensitivity and reproducibility at different concentrations of dopamine in acid medium (0.1 M HCl). It was shown that the functionalization of carbon electrodes with well-defined electrically active diblock copolymers and...
TC4 Symposium 2013
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Abhishek Ranjan, Boby George
This paper presents a new, simple and efficient dual-slope Capacitance-to-Digital Converter (CDC) that gives digital values of capacitances in a π-model of a capacitive proximity sensor. This CDC is suitable for a capacitive proximity sensor with two electrodes. When a human approaches the electrodes, it forms three capacitances, i.e., between human body and first electrode, between body and second electrode and between body and ground. It can be represented in a T-model or in an equivalent π-model. Conventional signal conditioning methods can provide only a single output from this network....
TC4 Symposium 2013
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Prashanth Vooka, Abhishek Ranjan, Boby George
This paper proposes a novel, simple and high accuracy Capacitance-to-Digital Converter (CDC). Capacitive sensors have numerous industrial applications such as humidity sensing, human touch sensing, flow measurement, ice detection, etc. In most of these applications a sinusoidal excitation is employed or preferred to achieve high sensitivity and accuracy. In order to get a final digital output from a conventional bridge based circuit with a capacitive sensor, an Analog-to-Digital Converter ADC is required. CDCs wherein capacitive sensor is an integral part of a sigma-delta ADC are available...
TC4 Symposium 2013
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Paolo Magnone, Pier Andrea Traverso, Giacomo Barletta, Claudio Fiegna
In this work we analyse the applicability of low-frequency (LF) noise measurement in order to study the defectiveness in the gate oxide of power MOSFETs. To this purpose we implement a low-noise experimental set-up, which is able to measure the drain current flicker (“1/f”) noise of the device under test (DUT). First, we show how these measurements can be used to empirically detect the physical model and related compact expressions, which best describe the source of fluctuations in this type of devices. Then, accordingly to the selected physical model, the defect density in the gate oxide is...
TC4 Symposium 2013
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Alfonso Attianese, Antonio Del Giudice, Marco Landi, Vincenzo Paciello, Antonio Pietrosanto
An AMI involves multiple heterogeneous devices, often produced by different manufacturers and which play different roles in the infrastructure, that need to communicate among each other. The DLMS/COSEM seems a good candidate to fulfill the requirement, being targeted to smart meters and supporting different communication channels. However the time resolution provided by the DLMS is in the order of hundredths of seconds: such resolution combined with an appropriate synchronization protocol could contribute to obtain measurements with sufficient resolution in time to make possible an accurate...
TC4 Symposium 2013
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Jürgen Funck, Clemens Gühmann
A large variety of time synchronization protocols for wireless sensor networks has been suggested. Yet, setting up a sensor network for synchronized data acquisition based on those algorithms is not a trivial task. This paper outlines two different approaches to time synchronous sampling in wireless sensor networks, discusses their advantages and disadvantages and gives recommendations on when to chose which approach.
TC4 Symposium 2013
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