scholarly journals Comparisons of Sensor Position for Electrical Capacitance Volume Tomography (Ecvt)

2016 ◽  
Vol 10 (4) ◽  
pp. 150
Author(s):  
Irfana Kabir Ahmad ◽  
Muhammad Mukhlisin ◽  
Hassan Basri
Keyword(s):  
Dielectric Material ◽  
Three Dimensional ◽  
Axial Direction ◽  
Three Dimension ◽  
Electrical Capacitance ◽  
Sensitivity Matrix ◽  
Sensor Position ◽  
Electrical Capacitance Volume Tomography ◽  
Dimensional Object ◽  
Dimension Space

<strong><strong></strong></strong><p>Tomography is a technique used to produce true reconstructed images from signal data. This data projection is measured capacitance by numerous sensors located on the surface of the object at different position. Sensitivity matrix with three-dimensional variation, especially in axial (z-axiz) direction are required for imaging a three-dimensional object to differentiate the depth along the sensor length so that the electrical field intensity can be distributed equally all over the three dimension space. In ECVT, when a dielectric material is introduced into the vessel, the variation in the electrical capacitance between all possible combinations of electrodes are measured. These changes are caused by diference in the permittivity of that material. From these capacitance measurements, an image based on the variation of the permittivity of the cross section contents can be obtained. In this study a numerical model using combine COMSOL MULTIPHYSICS v3.5 and MATLAB 2008a for imaging of an object was developed. Three different position of rectangular sensor: 1-sided sensor, 3-sided and U-shape sensor was designed and analyzed. 1-sided sensor displayed comparatively more uniform in both radial and axial direction in the comparisons of sensitivity distribution.</p>

Electrical Capacitance Volume Tomography (ECVT) for industrial and medical applications-An Overview

2015 ◽  
Vol 11 (1) ◽  
pp. 2897-2908
Author(s):  
Mohammed S.Aljohani
Keyword(s):  
Imaging Technique ◽  
Three Dimensional ◽  
Biological Processes ◽  
Electrical Capacitance ◽  
Image Reconstruction Techniques ◽  
Phase Dynamics ◽  
Non Invasive ◽  
Electrical Capacitance Volume Tomography ◽  
And Performance ◽  
Optimization And Performance

Tomography is a non-invasive, non-intrusive imaging technique allowing the visualization of phase dynamics in industrial and biological processes. This article reviews progress in Electrical Capacitance Volume Tomography (ECVT). ECVT is a direct 3D visualizing technique, unlike three-dimensional imaging, which is based on stacking 2D images to obtain an interpolated 3D image. ECVT has recently matured for real time, non-invasive 3-D monitoring of processes involving materials with strong contrast in dielectric permittivity. In this article, ECVT sensor design, optimization and performance of various sensors seen in literature are summarized. Qualitative Analysis of ECVT image reconstruction techniques has also been presented.

scholarly journals Desain dan Manufaktur Model Piston Jupiter MX 135 cc Dengan Menggunakan 3D Printer

2020 ◽  
Vol 1 (2) ◽  
pp. 73-80
Author(s):  
Wandro Siregar ◽  
Richard A.M. Napitupulu ◽  
Parulian Siagian
Keyword(s):  
3D Printing ◽  
Rapid Prototyping ◽  
Manufacturing Process ◽  
Three Dimensional ◽  
Product Development Process ◽  
3D Printer ◽  
Three Dimension ◽  
Dimensional Object ◽  
Material Temperature ◽  
Thickness Layer

A product that will be mass produced requires an initial prototype so that it can assess whether a product design meets the desired criteria and is ready to be mass produced. For the purposes of making the initial prototyping, one alternative is to use 3D printing. Prototyping is an early example of a concept as part of the product development process. Rapid Prototyping allows the visualization of a 3D (three-dimension) image into an original three-dimensional object that has a volume. In addition, rapid prototyping products can also be used to test certain parts. In the design process the 2017 Solidworks software and manufacturing process are used anet type 3D printer. In the manufacturing process many 3D Printer parameters must be regulated and very influential on the manufacturing results to be obtained, including the 3D printer parameter settings in the slicing process. This is a process that is very influential on the results, where the process of slicing the material temperature, printing speed, wall thickness, layer thickness and support must be set properly. In the future it is expected that research on 3D printing manufacturing results with the same printer parameters for the design results of some CAD software.

A Three-Dimensional Position System Using Digital TDE Receiver and Cylindrical Array Antenna

2013 ◽  
Vol 284-287 ◽  
pp. 2603-2608
Author(s):  
Jeich Mar ◽  
Shin Ru Wu ◽  
Yu Ting Wang ◽  
Kuei Chou Tsai
Keyword(s):  
Rayleigh Fading ◽  
Three Dimensional ◽  
Direction Of Arrival ◽  
Time Delay Estimation ◽  
Delay Estimation ◽  
Position System ◽  
Three Dimension ◽  
Newton Interpolation ◽  
Dimension Space ◽  
Digital Time

Based on the digital time delay estimation (TDE) and Gauss-Newton Interpolation algorithms, the circular error probability (CEP) of the proposed four-station position system using time difference of arrival (TDOA) over Rayleigh fading channel was studied by numerical computation in three-dimension space. The hybrid three-station TDOA and direction of arrival (DOA) position system was used to improve the reliability of four-station TDOA position system. Simulations indicate that the accuracy of the proposed position system is significantly decreased by reducing one measuring station and providing one direction of arrival (DOA) measurement.

Reconstruction of Objects from their Projections Using Orthogonal Functions

1973 ◽  
Vol 31 ◽  
pp. 268-269
Author(s):  
Elrnar Zeitler
Keyword(s):  
Unit Area ◽  
Three Dimensional ◽  
One Dimension ◽  
Spatial Density ◽  
Dimensional Representation ◽  
Orthogonal Functions ◽  
Object A ◽  
Plane Normal ◽  
Dimensional Object ◽  
Spatial Density Distribution

Considering any finite three-dimensional object, a “projection” is here defined as a two-dimensional representation of the object's mass per unit area on a plane normal to a given projection axis, here taken as they-axis. Since the object can be seen as being built from parallel, thin slices, the relation between object structure and its projection can be reduced by one dimension. It is assumed that an electron microscope equipped with a tilting stage records the projectionWhere the object has a spatial density distribution p(r,ϕ) within a limiting radius taken to be unity, and the stage is tilted by an angle 9 with respect to the x-axis of the recording plane.

scholarly journals The first observation of 4D tomography measurement of plasma structures and fluctuations

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chanho Moon ◽  
Kotaro Yamasaki ◽  
Yoshihiko Nagashima ◽  
Shigeru Inagaki ◽  
Takeshi Ido ◽  
...  
Keyword(s):  
Steady State ◽  
Three Dimensional ◽  
Axial Direction ◽  
Axial Position ◽  
Entire Cross Section ◽  
Helicon Plasma ◽  
Emission Profile ◽  
Dimensional Measurement ◽  
Tomography System ◽  
Three Dimensional Measurement

AbstractA tomography system is installed as one of the diagnostics of new age to examine the three-dimensional characteristics of structure and dynamics including fluctuations of a linear magnetized helicon plasma. The system is composed of three sets of tomography components located at different axial positions. Each tomography component can measure the two-dimensional emission profile over the entire cross-section of plasma at different axial positions in a sufficient temporal scale to detect the fluctuations. The four-dimensional measurement including time and space successfully obtains the following three results that have never been found without three-dimensional measurement: (1) in the production phase, the plasma front propagates from the antenna toward the end plate with an ion acoustic velocity. (2) In the steady state, the plasma emission profile is inhomogeneous, and decreases along the axial direction in the presence of the azimuthal asymmetry. Furthermore, (3) in the steady state, the fluctuations should originate from a particular axial position located downward from the helicon antenna.

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