Displacement Current Phase Tomography for Lossy Medium Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrical Capacitance Volume Tomography (ECVT) faces limitations in achieving high resolution imaging due to the minimum signal-to-noise ratio requirement, which restricts the number of sensor plates and thus the imaging resolution, especially when dealing with materials of high dielectric contrast like water, complicating image reconstruction and velocity measurement.
Innovation Solution
The introduction of Displacement Current Phase Tomography (DCPT) uses the phase of the measured current, in addition to its amplitude, to reconstruct images, employing a sensitivity matrix based on phase information to achieve linear relationships and improve resolution, particularly for lossy materials and multiphase flows, without requiring electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of sensor plates is increased to acquire more capacitance data, then the imaging resolution is improved, but the area of each sensor plate decreases, reducing the signal-to-noise ratio
Solution Approach 1:
The patent divides each sensor plate into multiple smaller segments that can be independently controlled and measured. This segmentation allows the system to maintain a large total sensor area for high resolution while ensuring each individual segment maintains sufficient area to achieve the minimum signal-to-noise ratio requirement. The segments can be selectively activated based on the imaging requirements.
Solution Approach 2:
The patent implements dynamic control of sensor plate segments through individual addressing capability. The system can dynamically activate different segments based on the specific imaging task, allowing optimization of both resolution and signal quality. This dynamic activation pattern enables the system to adapt to different imaging scenarios and maintain optimal performance.
2Reliability
If the minimum sensor plate area is maintained to ensure sufficient signal level, then the signal-to-noise ratio is improved, but the number of available sensor plates is limited, reducing imaging resolution
Solution Approach 1:
By segmenting each sensor plate into multiple smaller segments, the patent enables the system to use more sensor plates overall while maintaining sufficient area for each individual segment. This segmentation strategy allows the total number of active sensing elements to increase, thereby improving resolution without compromising the signal quality of individual measurements.
Solution Approach 2:
The patent transitions from a two-dimensional array of large sensor plates to a multi-dimensional configuration where each plate is divided into segments that can be independently controlled. This dimensional transformation allows the system to achieve higher resolution by utilizing the segment structure, effectively adding a layer of control and measurement granularity.
3Ease of operation
If conventional ECVT is used for imaging high dielectric contrast materials like water, then the imaging process is simplified, but the phase information is lost, reducing measurement accuracy
Solution Approach 1:
The patent introduces phase information as an intermediary measurement parameter that complements the traditional amplitude-based capacitance measurements. By incorporating phase data from the sensor signals, the system gains additional information about the dielectric properties of materials, particularly for high contrast materials like water. This intermediary phase measurement enables more accurate characterization of lossy materials while maintaining the simplicity of the ECVT imaging process.
Solution Approach 2:
The patent changes the measurement parameter from purely amplitude-based capacitance to include phase information. This parameter change allows the system to capture additional characteristics of the dielectric materials, particularly their lossy properties. The phase information provides a new dimension of measurement that enhances accuracy for high dielectric contrast materials without fundamentally altering the imaging approach.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
DCPT provides high-resolution imaging and accurate velocity measurement by leveraging the linearity of phase measurements with object volume, effectively addressing the limitations of conventional ECVT in imaging high dielectric contrast materials and multiphase flows, and is applicable to both stationary and moving materials.
Implementation Method 1
the real and imaginary parts of the current signal are related to conductivity and permittivity respectively through the displacement current
Implementation Method 2
uses the phase of the measured current, in addition to its amplitude, to reconstruct images
Implementation Method 3
the capacitance level of a particular sensor plate combination is directly proportional to the area of the plates
Implementation Method 4
Electrical Capacitance Volume Tomography (ECVT) is a non-invasive imaging modality
Data Source
AI summary
A system and method for Displacement Current Phase Tomography. The present system invention obtains a linear relationship between mutual displacement current from a sensor (output current of the measuring electrode terminals) and the area (or volume) of an object to be imaged in the imaging domain. The system uses capacitance sensors and utilizes the phase of the measured current, in addition to the amplitude, to reconstruct an image.