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Eddy current sensors, as one of nondestructive testing and evaluation instruments, have been widely used in displacement measurement as well as defect characterization. However, in eddy current displacement measurement, the test not only depends on the displacement between the coil and samples, but also relates to the electrical and magnetic properties (such as electrical conductivity and magnetic...
The coil impedance of eddy current sensor depends on sample electromagnetic properties and the displacement between sample and coil, so eddy current sensor can be developed to be a kind of nondestructive evaluation sensor to characterize the integrity of sample as well as a displacement sensor to measure distance or coating thickness. A bottleneck problem for eddy current displacement sensor is the...
The displacement between the coil of eddy current sensor and the sample can influence the distribution of the eddy current in sample, consequently cause the change of the coil impedance, so the eddy current can be developed as a displacement measurement device. This paper aims to develop a new of eddy current sensor which is independent of the sample electromagnetic properties. Extended from the theoretical...
The characteristics of conventional eddy current sensor are dependent on the electromagnetic properties of the target materials. In this paper, according to the impedance vector projecting method, a measuring circuit with waveform generator, impedance to voltage converter, X/R orthogonal resolver, impedance normalizer, associated with nonlinear compensation is designed to eliminate the influence caused...
Presently, eddy current evaluation has been used in many engineering fields, such as flaw or cracks testing, distance measurement, and material properties measurement. However, eddy current testing is sensitive to multiple parameters, e.g. the sensor lift-off, and the measured curvature, the electromagnetic properties of measured. In this paper, the finite element model of sensor under spheroid and...
To optimize the structure of an eddy current sensor (ECS) coil, the computation process of the coil impedance is firstly derived using finite element method according to the Ponying Theorem; Then the 3D and 2D finite element model are built based on the modeling theory and the relative magnetic theory; Next, the influence of the coil shapes and its geometric parameters on the properties of ECS are...
A 3D electromagnetic simulation of an eddy current sensor with an air-cored cylinder coil was studied by Finite Element Method. Based on the characters of structure and boundary conditions, two finite element models of eddy current sensor were built. Then the influences of eddy current sensor performance caused by its parameter changes were simulated with the better model. The simulating results indicate...
In this paper, two modal analysis methods are addressed to research the structural robustness of a computer motherboard. One is experimental modal analysis, and the other is computational modal analysis. Experimental modal analysis is carried out by single input multiple output method and the modal parameters of computer motherboard are extracted by multiple reference point modal parameter extraction...
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