The Experts below are selected from a list of 195 Experts worldwide ranked by ideXlab platform
Faranak Pourdanesh - One of the best experts on this subject based on the ideXlab platform.
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Experiences With a Two-Terminal-Pair Digital Impedance Bridge
IEEE Transactions on Instrumentation and Measurement, 2015Co-Authors: Luca Callegaro, Vincenzo D'elia, Marian Kampik, Dan Bee Kim, Massimo Ortolano, Faranak PourdaneshAbstract:This paper describes the realization of a two-terminal-pair digital impedance bridge and the test measurements performed with it. The bridge, with a very simple architecture, is based on a commercial two-channel digital signal synthesizer and a Synchronous Detector. The bridge can perform comparisons between the impedances having arbitrary phase and magnitude ratio. The bridge balance is achieved automatically in less than 1 min. $R$ – $C$ comparisons with calibrated standards, at kilohertz frequencies and 100- $\text{k}\Omega $ magnitude level, give ratio errors of the order of $10^{-6}$ , with potential for further improvements.
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Experiences with a two terminal-pair digital impedance bridge
arXiv: Instrumentation and Detectors, 2014Co-Authors: Luca Callegaro, Vincenzo D'elia, Marian Kampik, Dan Bee Kim, Massimo Ortolano, Faranak PourdaneshAbstract:This paper describes the realization of a two terminal-pair digital impedance bridge and the test measurements performed with it. The bridge, with a very simple architecture, is based on a commercial two-channel digital signal synthesizer and a Synchronous Detector. The bridge can perform comparisons between impedances having arbitrary phase and magnitude ratio: its balance is achieved automatically in less than a minute. $R$-$C$ comparisons with calibrated standards, at kHz frequency and 100 kohm magnitude level, give ratio errors of the order of $10^{-6}$, with potential for further improvements.
François Tranquart - One of the best experts on this subject based on the ideXlab platform.
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Spectral correlation of the embolic blood Doppler signal
2006Co-Authors: Jean Marc Girault, Mathieu Biard, Denis Kouamé, Aurore Bleuzen, François TranquartAbstract:In a previous study we have shown that take into account the quasi-cyclostationary properties of the blood Doppler signal is useful to detect embolus (red blood cell aggregates). In this latter approach, we have first considered a simple "off-line" Synchronous Detector. As results were very interesting, we have thought that the correlation spectrum could be an interesting alternative to the Synchronous detection. As the correlation spectrum of in vivo signal seems to be too complicated, we propose here to elucidate this apparent complexity by analytically computing the correlation spectrum of Doppler signal model with or without embolus.
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ICASSP (2) - Spectral Correlation of the embolic blood Doppler signal
2006 IEEE International Conference on Acoustics Speed and Signal Processing Proceedings, 1Co-Authors: Jean Marc Girault, Mathieu Biard, Denis Kouamé, Aurore Bleuzen, François TranquartAbstract:In a previous study we have shown that take into account the quasi-cyclostationary properties of the blood Doppler signal is useful to detect embolus (red blood cell aggregates). In this latter approach, we have first considered a simple "off-line" Synchronous Detector. As results were very interesting, we have thought that the correlation spectrum could be an interesting alternative to the Synchronous detection. As the correlation spectrum of in vivo signal seems to be too complicated, we propose here to elucidate this apparent complexity by analytically computing the correlation spectrum of Doppler signal model with or without embolus.
Jean Marc Girault - One of the best experts on this subject based on the ideXlab platform.
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Synchronous Detector as a new paradigm for automatic microembolus detection
International Journal of Biomedical Engineering and Technology (IJBET), 2014Co-Authors: Jean Marc Girault, Zheng ZhaoAbstract:We propose here a new Detector paradigm based on Synchronous detection. Unlike standard energy Detectors, this kind of Detector uses the pseudo-cyclo-stationarity properties of blood Doppler signals. The new Detector, that is synchronized with cardiac rhythm, was compared to a gold standard and a standard energy Detector. Detectors were evaluated according to clinical recordings from patients with carotid stenoses. The results showed that it was possible to detect inaudible microemboli. The detection rate was improved by 30% and the false alarm rate was below 2%.
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Spectral correlation of the embolic blood Doppler signal
2006Co-Authors: Jean Marc Girault, Mathieu Biard, Denis Kouamé, Aurore Bleuzen, François TranquartAbstract:In a previous study we have shown that take into account the quasi-cyclostationary properties of the blood Doppler signal is useful to detect embolus (red blood cell aggregates). In this latter approach, we have first considered a simple "off-line" Synchronous Detector. As results were very interesting, we have thought that the correlation spectrum could be an interesting alternative to the Synchronous detection. As the correlation spectrum of in vivo signal seems to be too complicated, we propose here to elucidate this apparent complexity by analytically computing the correlation spectrum of Doppler signal model with or without embolus.
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ICASSP (2) - Spectral Correlation of the embolic blood Doppler signal
2006 IEEE International Conference on Acoustics Speed and Signal Processing Proceedings, 1Co-Authors: Jean Marc Girault, Mathieu Biard, Denis Kouamé, Aurore Bleuzen, François TranquartAbstract:In a previous study we have shown that take into account the quasi-cyclostationary properties of the blood Doppler signal is useful to detect embolus (red blood cell aggregates). In this latter approach, we have first considered a simple "off-line" Synchronous Detector. As results were very interesting, we have thought that the correlation spectrum could be an interesting alternative to the Synchronous detection. As the correlation spectrum of in vivo signal seems to be too complicated, we propose here to elucidate this apparent complexity by analytically computing the correlation spectrum of Doppler signal model with or without embolus.
Luca Callegaro - One of the best experts on this subject based on the ideXlab platform.
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Experiences With a Two-Terminal-Pair Digital Impedance Bridge
IEEE Transactions on Instrumentation and Measurement, 2015Co-Authors: Luca Callegaro, Vincenzo D'elia, Marian Kampik, Dan Bee Kim, Massimo Ortolano, Faranak PourdaneshAbstract:This paper describes the realization of a two-terminal-pair digital impedance bridge and the test measurements performed with it. The bridge, with a very simple architecture, is based on a commercial two-channel digital signal synthesizer and a Synchronous Detector. The bridge can perform comparisons between the impedances having arbitrary phase and magnitude ratio. The bridge balance is achieved automatically in less than 1 min. $R$ – $C$ comparisons with calibrated standards, at kilohertz frequencies and 100- $\text{k}\Omega $ magnitude level, give ratio errors of the order of $10^{-6}$ , with potential for further improvements.
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Experiences with a two terminal-pair digital impedance bridge
arXiv: Instrumentation and Detectors, 2014Co-Authors: Luca Callegaro, Vincenzo D'elia, Marian Kampik, Dan Bee Kim, Massimo Ortolano, Faranak PourdaneshAbstract:This paper describes the realization of a two terminal-pair digital impedance bridge and the test measurements performed with it. The bridge, with a very simple architecture, is based on a commercial two-channel digital signal synthesizer and a Synchronous Detector. The bridge can perform comparisons between impedances having arbitrary phase and magnitude ratio: its balance is achieved automatically in less than a minute. $R$-$C$ comparisons with calibrated standards, at kHz frequency and 100 kohm magnitude level, give ratio errors of the order of $10^{-6}$, with potential for further improvements.
K. Suzuki - One of the best experts on this subject based on the ideXlab platform.
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A New Self-Calibration Method of an $LCR$ Meter for RF Resistance Calibration Using Capacitance Standards
IEEE Transactions on Instrumentation and Measurement, 2009Co-Authors: K. SuzukiAbstract:This paper describes how to calibrate a four-terminal-pair (4TP) LCR meter at the right (90deg) angle. The LCR meter uses the right angle signal to process a Synchronous Detector as a vector signal receiver. The right-angle calibration method uses, at a minimum, one variable-phase signal generator (SG) and a phase shift circuit. The SG does not require a precision right angle, but it does need good phase stability. The described phase shifter provides the required differential phase of nearly the right angle. As a result, the right-angle phase deviation of the LCR meter is better than 65 murad (0.223') with 37-murad (0.127') uncertainty at 10 MHz. This method is also applicable to the phase calibration of a vector network analyzer.
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A new LCR meter right angle phase self-calibration method for use in rf resistance calibrations by using capacitance standards
2008 Conference on Precision Electromagnetic Measurements Digest, 2008Co-Authors: K. SuzukiAbstract:This paper describes how to calibrate the right angle phase of a Four-Terminal-Pair (4TP) LCR meter. The meter uses the right angle signal to process Synchronous Detector as a vector receiver. The right angle calibration method uses, at least, one programmable phase signal generator and a phase shift circuits. The signal generator and the phase shifter do not require a precision 90 degree angle. As a result, the right angle phase deviation of the LCR meter is better than 100 murad at 10 MHz. This method is also applicable to the phase calibration of a vector network analyzer.
