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To explore the influence of the interface charges on the threshold voltage of pMOSFET, we present a novel device model in this paper. By dividing the gate oxide layer into several regions, and setting different interface charges in different regions, the relationship between the interface charges' length and the threshold voltage is well simulated by using 2D numerical simulation, in which the conditions...
The electric field has a very significant effect on the working conditions of electrical equipment. A passive electric field sensing system is developed to measure electric field strength based on the electric field induction theory. This paper studies an electric field sensing system comprising a probe head radius of 30 mm and a potential electrode radius of 18 mm. The testing system of the power...
Details regarding performance can be obtained by detecting the important parameters of transformer. One of the important parameters of transformer is the capacity. The transformer load can be adjusted in time according to the real capacity. Off-line measures are mainly taken in power industry, however, these methods have many disadvantages. In this study, we proposed an on-line capacity detection...
Electrical impedance tomography (EIT) is believed to be a distinctive imaging technology and have good prospect in the field of biomedical testing. A multi-channel electrical impedance measurement system using DSP is studied. It includes four modules: excitation source, electrode array, signal acquisition, and signal processing. The results in experiment demonstrate that the system can distinguish...
When distributed generations (DG) and storages are introduced into distribution network, power flow in the network is no longer single direction, in consequence, over-current relay, which is commonly used in distribution network cannot fulfill sufficient protection functions. Thus, more complicated protection principle, for example, directional protection may be needed in this situation. On the other...
This paper describes a novel method to detect the electrification state of ultra-high voltage transmission lines based on electric field measurement method, which involves measuring the electric field at points in the vicinity of transmission lines and computing the electric field strength at the same points according to charge simulation method. A power frequency electromagnetic field strength measurement...
Electrical impedance tomography (EIT) attempts to reconstruct the internal impedance distribution in a medium according to electrical measurements with electrodes on the medium surface. Main problem of EIT is the drift of electrodes during the medical applications, in which the body surface moves during breathing and posture change. In this paper, a new approach which can distinguish electrode movements...
Noise is inherent to any real imaging system. In this paper, a new voltage measurement approach, called blend measure pattern, is developed to deal with anti-noise problem in electrical impedance tomography. The paper adopts a single current source, applies electrical currents to the body using a pair of adjacent electrodes. Different from the conventional adjacent voltage measure pattern, the proposed...
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