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Sine wave

About: Sine wave is a research topic. Over the lifetime, 12183 publications have been published within this topic receiving 93013 citations. The topic is also known as: sinusoid.


Papers
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Proceedings ArticleDOI
11 Jun 2019
TL;DR: In this article, a pseudo random square signal is used as an input on the cell for impedance evaluation, and the effectiveness of the method has been validated based on simulation test, in order to obtain good results in terms of impedance estimation accuracy, minimizing time duration and energy consumption.
Abstract: Electrochemical Impedance Spectroscopy (EIS) is commonly used for the diagnosis of electrochemical energy accumulators, for example Li-Ion batteries in Electric and Hybrid Vehicles. Measuring the impedance in a wide frequency range, it is possible to investigate on the modifications of the internal electrochemical cell process, evaluating its current state of life. EIS test consists of the excitation of the battery, or cell, with a defined current signal, and then measuring the cell voltage, the frequency response of the system is computed. The classical EIS test, based on the excitation with a frequency controlled sine wave in input, requires expensive instruments and long time test procedures; therefore it has many problems on the integration on the embedded systems. In this paper, a pseudo random square signal, which shows a simply hardware implementation, is used as excitation signal input on the cell for the impedance evaluation. The effectiveness of the method has been validated based on simulation test, in order to obtain good results in terms of impedance estimation accuracy, minimizing time duration and energy consumption.

26 citations

Patent
18 Nov 2008
TL;DR: In this article, a ring type piezoelectric ultrasonic resonator with an integral multiple of 4 segments is described. And the number of the segments of the piezelectric ceramic is an integral multiplicative multiple of four.
Abstract: A ring type piezoelectric ultrasonic resonator includes a piezoelectric ceramic segmented for each quarter of wavelength of an applied AC electric field, wherein the piezoelectric ceramic is alternately polarized in polarization units each having two segments, and a sine wave AC electric field and a sine wave AC electric field having a predetermined phase difference from the sine wave AC electric field are alternately applied to each of the segments. Further, the number of the segments of the piezoelectric ceramic is an integral multiple of 4. Moreover, the sine wave AC electric field applied to each of the segments of the piezoelectric ceramic has a phase difference of 90-degree with respect to adjacent segments.

26 citations

Journal ArticleDOI
TL;DR: In this article, a simple change to the experimental set-up can produce a signal that has an approximately trapezoidal profile, which produces a much smaller error than for square wave modulation.

26 citations

Journal ArticleDOI
TL;DR: This paper reports on having successfully measured the increase in the uncompensated resistance of an electrochemical cell upon approach to single, living, biological cells, while simultaneously measuring the metabolic oxygen consumption.
Abstract: The ability to measure chemical gradients surrounding single cells provides novel insights into several areas of cell dynamicsparticularly metabolism. Detection of metabolic oxygen consumption can be achieved from a single mammalian cell using a modulated amperometric sensor in a self-referencing mode. To date, however, apart from visual cues, we do not have a reliable and cell-compatible method for determining and stabilizing the position of such probes. In this paper, we report on having successfully measured the increase in the uncompensated resistance of an electrochemical cell upon approach to single, living, biological cells, while simultaneously measuring the metabolic oxygen consumption. This was accomplished by applying an ac and a dc excitation signal to the electrode. The applied ac waveform was a 100-kHz sine wave with an amplitude of 10 mV rms, while the dc voltage applied was −600 mV. The two signals were shown not to interfere with one another. Furthermore, it is shown that the sample−probe...

26 citations

Patent
02 Mar 2007
TL;DR: In this paper, a DC bias voltage lower than the breakdown voltage is applied to an InGaAs/InP avalanche photodiode (APD) to detect a single photon in the 1550 nm communication band at a high speed.
Abstract: In order to operate a single photon detector in communication wavelength band at a high speed, a DC bias voltage 2 lower than the breakdown voltage is applied to an InGaAs/InP avalanche photodiode (APD) 1. A 500 MHz sine wave gating signal 3 is superimposed with the DC bias voltage 2 and applied to the APD so as to exceed the breakdown voltage by about 4V in a fractional time of each period. The sine wave gating signal 3 passed through the APD 1 is substantially completely removed by a filter 4, thereby improving S/N and enabling to detect a single photon even if the avalanche multiplication time is shortened to reduce the after pulse and the detection period. As a result, it achieves to detect a single photon in the 1550 nm communication band at a high speed.

26 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202378
2022157
2021138
2020253
2019344
2018336