Split-TLGR Conductivity Sensing for Water Void Fraction
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Solution Overview
Problem
Conventional methods for determining water void fraction in conductive fluid mixtures, such as those using dielectric sensors, conductive sensors, or microwave sensors, are inaccurate due to simultaneous measurement of all components, complicating the estimation of water void fraction independent of other components like oil and gas.
Innovation Solution
A fluid conductivity sensor system utilizing a split-toroidal loop-gap resonator (split-TLGR) system with a vector network analyzer (VNA) to measure fluid conductivity, allowing derivation of water void fraction independently of other components by measuring power dissipation through dielectric windows in a duct.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional dielectric sensors, conductive sensors, inductive coils, or microwave sensors are used to determine water void fraction, then measurement of all mixture components is achieved, but measurement precision deteriorates due to simultaneous measurement of all components complicating water void fraction estimation
Solution Approach 1:
The measurement system is segmented into multiple independent sensing mechanisms: dielectric sensors for permittivity measurement, conductive sensors for conductivity measurement, and gamma ray sensors for density measurement. Each sensor type measures a specific property independently, allowing the water void fraction to be calculated by combining these separate measurements rather than attempting to measure all components simultaneously with a single sensor type.
Solution Approach 2:
The system utilizes multiple physical parameters (permittivity, conductivity, gamma absorption) to characterize the fluid mixture. By measuring different physical parameters with specialized sensors and combining the information, the system can determine water void fraction more accurately than any single parameter measurement could achieve alone.
2Measurement precision
If measurements of permittivity and/or gamma absorption are used to determine water void fraction, then measurement capability is provided, but measurement precision deteriorates because both measuring methods are influenced by all components of the mixture simultaneously
Solution Approach 1:
The measurement approach is segmented into multiple independent sensing modalities (dielectric sensing for permittivity, conductive sensing for conductivity, gamma ray sensing for density). Each modality responds differently to the mixture components, and by combining these segmented measurements, the system achieves accurate water void fraction determination while being less susceptible to interference from individual components.
Solution Approach 2:
The system employs a composite sensing approach that integrates multiple sensor types and measurement methods. By combining dielectric sensors, conductive sensors, and gamma ray sensors into a unified measurement system, the system leverages the complementary strengths of each sensor type to achieve accurate water void fraction measurement that is robust against variations in mixture composition.
3Loss of information
If conventional sensors measure all components simultaneously, then comprehensive fluid analysis is achieved, but water void fraction estimation becomes complicated and less precise
Solution Approach 1:
The sensor system is segmented into specialized sensors that each measure specific properties: dielectric sensors measure permittivity (related to water content), conductive sensors measure conductivity (also related to water content), and gamma ray sensors measure density. This segmentation allows the system to extract water-specific information from multiple independent measurements rather than attempting to resolve all components from a single complex measurement.
Solution Approach 2:
The system measures multiple physical parameters (permittivity, conductivity, density) that each have different relationships to the mixture components. Water affects all three parameters, while oil and gas affect them differently. By measuring these parameter changes simultaneously with specialized sensors, the system can isolate and quantify the water content information more accurately than by measuring a single parameter.
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
Enables accurate measurement of water void fraction in fluid mixtures by isolating the effect of conductive components, providing high sensitivity to water content while minimizing interference from non-conductive components like oil and gas, and allowing measurement of fluid conductivity and flow velocity.
Implementation Method 1
Fluid conductivity sensor based on magneto-inductive power transfer dissipation
Implementation Method 2
measuring power dissipation through dielectric windows
Implementation Method 3
a dielectric window system operatively connected to the duct, wherein the dielectric window system comprises a first dielectric window built-into a first surface of a wall of the duct
Data Source
AI summary
A fluid conductivity sensor (FCS) system for determining a water void fraction in a fluid mixture flows comprises a duct containing the fluid mixture flows; a dielectric window system operatively connected to the duct, wherein the dielectric window system comprises a first dielectric window built-into a first surface of a wall of the duct and a second dielectric window built-into a second surface of the wall aligned and opposite to the first surface; a split-toroidal loop-gap resonator (split-TLGR) system operatively connected to the dielectric window system and the duct, wherein the split-TLGR system comprises a first split-TLGR built-into the first dielectric window and a second split-TLGR built-into the second dielectric window; and a vector network analyzer (VNA) operatively connected to the split-TLGR system and configured to measure the fluid conductivity, wherein the water void fraction is derived from the fluid conductivity.