We study a new image sensor that is reminiscent of traditional photographic film. Each pixel in the has binary response, giving only 1-bit quantized measurement local light intensity. To analyze its performance, we formulate oversampled sensing scheme as parameter estimation problem based on Poisson statistics. show that, with single-photon quantization threshold and large oversampling factors, Cramér-Rao lower bound (CRLB) variance approaches an ideal unquantized sensor, i.e., if there were...

A high-efficiency broadband acoustic energy harvester consisting of a compliant-top-plate Helmholtz resonator (HR) and dual piezoelectric cantilever beams is proposed. Due to the high mechanical quality factor strong multimode coupling HR cavity, top plate beams, efficiency in broad bandwidth obtained. Experiment exhibits that proposed at 170-206 Hz has 28-188 times higher than conventional using with composite diaphragm. For input pressure 2.0 Pa, 0.137-1.43 mW output power corresponding...

Measurement errors of a capacitive voltage transformer (CVT) are relevant to its equivalent parameters for which divider contributes the most. In daily operation, dielectric aging, moisture, breakdown, etc., it will exert mixing effects on divider’s insulation characteristics, leading fluctuation in result measurement error. This paper proposes an circuit model represent CVT incorporates characteristics divider. After software simulation and laboratory experiments, relationship between is...

We propose a new image device called gigavision camera. The main differences between conventional and camera are that the pixels of binary orders magnitude smaller. A can be built using standard memory chip technology, where each bit is designed to light sensitive. gray level obtained from by low-pass filtering sampling. advantage its response non-linear similar logarithmic function, which makes it suitable for acquiring high dynamic range scenes. larger number considered, higher will be. In...

To facilitate better interpretation of dielectric response measurements—thereby directing numerical evidence for condition assessments oil-paper-insulated equipment in high-voltage alternating current (HVAC) transmission systems—a novel approach is presented to estimate the parameters extended Debye model (EDM) using wideband frequency domain spectroscopy (FDS). A syncretic algorithm that integrates a genetic (GA) and Levenberg-Marquardt (L-M) introduced present study parameterize EDM FDS...

Despite the technical popularity of dielectric response (DR) methods used for nonintrusive diagnosis cellulose insulation condition, it is still considered a challenging and tough task so far to trustworthily interpret details measurement results further understanding tracing changes behind. From novel perspective parametric study on circuital DR equivalence cellulosic insulation—extended Debye model (EDM), new characteristic quantities quantification approach determine moisture condition...

To address the lack of reliable power supplies for lightning current measurement systems (LCMS), this paper proposes a novel self-powered LCMS. The required operation LCMS can be provided by harvesting surge that is measured using coil such system energized to complete single-cycle and data recording. In manner, stand-alone triggered currents, and, hence, signal acquisition activated automatically. particular, designs two-channel passive peak-holding circuit as low-power substitution...

Direct lightning strokes account for a large proportion of line faults. Lightning faults can be classified into several kinds, and the corresponding protection methods differ. The type these should identified to establish targeted measures against improve design. In this study, non-contact multi-physical parameter monitoring system is proposed. voltage insulator string grounding current transmission tower are chosen as two physical parameters show characteristic quantities different stroke...

The explicitly numerical or well-defined correlations between the dielectrics responses (DRs) and dielectric essences of oil-impregnated paper (OIP) insulation have not been fully understood yet. As a result, it is rather difficult to quantitatively diagnose critical condition, like determining moisture content in (MCP) power equipment only using electrical-based techniques such as frequency domain spectroscopy (FDS). To obtain MCP value, from new perspective parametric study on circuital DR...

A large number of electric vehicles are connected to the family micro grid will affect operation safety power and quality power. Considering factors price vehicle as a distributed energy storage device, two stage optimization model is established, improved discrete binary particle swarm algorithm used optimize parameters in model. The proposed control strategy charging discharging practical significance for rational device participating peak load regulation consumption.

To address the equivalent model of dielectric response oil-impregnated paper insulation, outlined a method to effectively determine parameters extended Debye (EDM) using frequency domain spectroscopy (FDS) in wideband. Firstly, vector fitting (VFM) was employed for rational approximation FDS curves. Thereafter, capacitance and resistance geometry polarization branches EDM were determined circuit synthesis method. Further, match clear physical essence behaviors, passive enforcement applied...

A tunable acoustic energy harvester consisting of dual piezoelectric cantilever beams and a Helmholtz resonator with perforated backplate is proposed. The tunability the operation frequency band can be achieved not only via simply adjusting radius (r) aperture due to strong dependence resonance frequencies on impedance affected by r, but also changing distance (d) between because their magnetic force interaction. Experimental results show that as r (or d) increases from 0 1.4) 1.0 3.4) cm,...

The homoclinic tangency for a rotor-active magnetic bearings (AMB) system with the time-varying stiffness are considered in this paper. zeros of Melnikov equation paid more attentions and 3-order zero was gained some numerical results under parameter perturbations were shown.

A cracked rotor-active magnetic bearings (AMB) system with the time-varying stiffness is modeled by a piecewise smooth due to breath of crack in rotating shaft. The governing nonlinear equations motion for nonsmooth are established and solved numerical method. simulation results show that grazing bifurcation, period-double bifurcation chaotic motions exist response. These bifurcations can give rise jumps between periodic motions, quasi-periodic chaos.

The aim of this paper is to investigate the propagation ultrasonic waves in a steel wire and determine whether it possible detect locate defects by finite element method. First, dispersion curves longitudinal modes were obtained calculated analytically. Then, guided propagating with or without simulated To take account damage, V-type groove modeled have different sizes mouth width tip depth. It found that method can be applied model guided-wave corrosions.

To address lack of reliable power supplies for lightning current measurement systems (LCMSs), this paper proposes a novel type self-powered LCMS. The required operational consumption the LCMS can be harvested using coil from large which is being measured such that system energized to complete single-cycle signal and data record. polarity, peak specially designed two-channel holding circuit as low-power substitution conventional high-speed sampling modules, thereafter with trigger time, three...