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A direct method was proposed to reconstruct electrical admittivity, i.e., conductivity and permittivity, for electrical tomography in this paper. It is a direct algorithm of the image reconstruction, as the value of the real and imaginary parts of the admittivity at any position can be obtained independently. It was implemented through numerical integration. Since the Gauss-Legendre quadrature was...
A new method of parameters design for aerial survey based on the laser footprint distribution of airborne LiDAR was proposed. In order to implement the method of parameters design, the relationship maps between the distribution of laser footprints and different parameters, respective the parameters of laser beam, flight and laser scanning system were created. Using the actual parameters and the independent...
A factorization method was introduced to electromagnetic tomography (EMT) in this paper. Compared with the traditional methods based on the sensitivity theorem, the proposed method can generate the reconstructed images directly. Neither matrix inversion nor iterations is needed in the reconstruction process. The reconstruction process is simple, as the test function is calculated according to the...
In this paper, the wet-gas flow modeling for the straight section of a throat-extended Venturi meter was studied. Based on the separated-flow theory, a flow model was presented. The relationship between the fluctuating properties of the differential pressure (DP) over the straight section and the quality of the wet-gas flow was also studied, and a flow model of the fluctuation of the DP for wet-gas...
A sensor typically used in electrical capacitance tomography (ECT) was generalized to reconstruct the conductivity distribution in this paper. Analytical model was established for the sensor. As a result, the sensitivity matrix and the electric field lines can be obtained directly by using the formulae, which are fast and simple. Two reconstruction methods are proposed based on the model, i.e. iterative...
A direct reconstruction method for electromagnetic tomography (EMT) is introduced. It is suitable to reconstruct the distributions with high permeability and low conductivity. By using the proposed method, the permeability distribution in any part of the region of interest can be obtained directly and independently. Simulated data for EMT with sixteen coils were obtained in two dimensions. Neither...
In this paper, wet gas flow modeling for the straight section of a throat-extended Venturi meter was studied. A static model based on the separated flow theory was presented. Experiments were carried out within static pressure range of 0.26~0.86 MPa, gas volumetric flowrate range of 80~120 m3/h, water volumetric flowrate range of 0.3~4.5 m3/h and quality range of 0.07~0.36. It was obtained that the...
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