Electrical Tomography Probe Position Deviation Correction
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Solution Overview
Problem
Existing methods for monitoring scaling and boundary layers in industrial processes, such as those in the oil industry, often result in erroneous conclusions due to deviations in measurement setup and geometry, leading to inaccurate determination of electrical properties within process equipment.
Innovation Solution
A method utilizing electrical tomography that accounts for position and shape deviations of measurement probes through simulated statistics, allowing for accurate determination of electrical properties like permittivity and conductivity by adjusting approximations based on objective functions and prior models, thereby improving the reliability of material condition assessments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electrical tomography is used to determine electrical properties in the free inner zone, then material conditions can be monitored, but scaling or deposition on equipment surfaces causes erroneous conclusions
Solution Approach 1:
The patent extracts the scaling and deposition layer from the measurement region by defining a free inner zone that excludes the boundary layer. The observation model specifically targets the electrical properties within this extracted region, separating the measurement objective from the harmful scaling effects on the equipment surfaces.
Solution Approach 2:
The patent introduces an observation model as an intermediary that mediates between the measurement probe and the target region. This model accounts for the presence of scaling and deposition by incorporating boundary layer effects, allowing accurate determination of electrical properties in the free inner zone despite the harmful factors present in the overall system.
2Reliability
If measurement probes are used to determine electrical properties, then monitoring is enabled, but deviations in probe position and shape cause erroneous conclusions
Solution Approach 1:
The patent applies parameter changes by allowing the observation model to account for variations in probe position and shape as measurable parameters. Instead of assuming ideal probe conditions, the model incorporates actual probe deviations as variables that affect the measurement, enabling reliable monitoring despite geometric imperfections.
Solution Approach 2:
The patent implements feedback by using the observation model to continuously adjust and refine the electrical property determination based on actual measurement conditions. The model incorporates information about probe position and shape deviations to correct the measurements, creating a feedback loop that maintains reliability despite geometric variations.
3Reliability
If scaling is monitored to prevent clogging, then process safety is improved, but the scaling itself distorts the electrical property measurements in the free inner zone
Solution Approach 1:
The patent segments the measurement region into distinct zones: a free inner zone for material property measurement and a boundary layer region for scaling monitoring. This segmentation allows simultaneous monitoring of both process safety (scaling) and measurement accuracy (electrical properties in the free zone) without interference between the two functions.
Solution Approach 2:
The observation model serves as an intermediary that reconciles the conflicting requirements of scaling monitoring and accurate electrical property measurement. It incorporates boundary layer effects as corrective terms, allowing the system to monitor scaling for safety while maintaining measurement accuracy in the free inner zone.
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
This approach enables precise monitoring of scaling and boundary layers, reducing errors in electrical property determination and providing reliable estimates of material conditions within process equipment, even with varying probe positions and shapes.
Implementation Method 1
The electrical property of interest may be, for example, permittivity or conductivity of the materials present in the target region
Implementation Method 2
The electrical property of interest may be, for example, permittivity or conductivity of the materials present in the target region
Implementation Method 3
Electrical tomographic investigation methods, such as electrical tomographic imaging, cover various methods for investigating or monitoring a target region on the basis of determining an estimation of an electrical property of interest
Data Source
AI summary
A method for determining an electrical property of interest of material(s) in a target region confined by a boundary surface comprises receiving measured values of a measurable electrical quantity; providing simulated values of the measurable electrical quantity for an initial approximation of the electrical property conditions; determining an objective function comprising observation difference between the measured and the simulated values as well a prior model, and determining an adjusted approximation; and providing, on the basis of the adjusted approximation, an estimation of the electrical property of interest. Simulated statistics of a position deviation in the observations is provided, caused by a difference of an effective position of the measurement probe from a predetermined reference position; and by providing the observation model to define the observations of the measurable electrical quantity to correspond to measurements made with the measurement probe in the reference position.