Fluid Sensor Solid Cavity Filler for High-Pressure RF Measurement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing fluid sensors with air- or water-filled outer cavity regions face challenges in high-pressure environments, including structural integrity issues and reduced measurement accuracy due to pressure changes and absorption of RF electromagnetic fields.
Innovation Solution
A fluid sensor design featuring a base member and cavity filler member that allow for the complete or partial filling of the outer cavity region with a solid material, preventing fluid migration and reducing RF field absorption, thereby enhancing structural integrity and measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the outer cavity region is filled with air, then the RF electromagnetic field uniformity is improved, but the structural integrity deteriorates under high pressure
Solution Approach 1:
The patent changes the physical state of the filling material from gas (air) to solid (polymer material), fundamentally altering the properties of the outer cavity region. This parameter change allows the material to simultaneously provide structural support under high pressure while maintaining RF electromagnetic field uniformity through its dielectric properties and void-free structure.
Solution Approach 2:
The patent uses a polymer material that combines the beneficial properties of both air (RF transparency, field uniformity) and solid structures (pressure resistance, structural integrity). The polymer acts as a composite solution that eliminates the need for separate structural support components while maintaining electromagnetic field characteristics.
2Strength
If the outer cavity region is filled with water, then the structural integrity is improved, but the RF field absorption increases
Solution Approach 1:
The patent changes the electrical properties of the filling material by selecting a polymer with low dielectric loss and low conductivity, fundamentally different from water's high conductivity. This parameter change eliminates RF field absorption while maintaining the structural integrity benefits of a solid filling material.
Solution Approach 2:
The patent replaces water (which requires continuous monitoring and replacement due to absorption and pressure issues) with a permanent polymer material that maintains its properties indefinitely under operating conditions, eliminating the need for maintenance related to fluid degradation.
3Strength
If high pressure seals are added to prevent fluid ingress, then the structural integrity is improved, but the device complexity increases
Solution Approach 1:
The polymer material performs multiple functions simultaneously: it fills the outer cavity region, provides structural support under high pressure, maintains RF electromagnetic field uniformity, and prevents fluid ingress through its solid structure. This multi-functionality eliminates the need for separate high pressure seals and other protective components.
Solution Approach 2:
The patent merges the functions of structural support, electromagnetic field management, and fluid sealing into a single polymer filling material. This consolidation eliminates multiple separate components (cavity member, seals, casings) and simplifies the overall device structure while maintaining all required functions.
4Measurement precision
If the cavity member is separated from the base pipe to define a larger resonant cavity, then the RF electromagnetic field uniformity is improved, but the device complexity increases
Solution Approach 1:
The polymer filling material simultaneously serves as the resonant cavity medium and the structural support element, eliminating the need for a separate cavity member. This multi-functionality maintains the benefits of a larger resonant cavity for field uniformity while simplifying the device structure by removing unnecessary components.
Solution Approach 2:
The patent merges the functions of the resonant cavity medium and structural support into a single polymer filling material, eliminating the need for a separate cavity member and reducing device complexity while maintaining RF electromagnetic field uniformity.
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
The design enables the fluid sensor to withstand higher pressures, prevent structural failure, and improve measurement accuracy by eliminating voids and reducing RF field absorption, allowing for more precise composition and flow characteristic analysis.
Implementation Method 1
the cavity member is configured so as to provide confinement for an electromagnetic field... detect a resonant peak in the frequency spectrum of the RF electromagnetic field
Implementation Method 2
the base member and the cavity filler member are each configured so as to permit transmission therethrough of electromagnetic radiation at a frequency of the electromagnetic field
Data Source
AI summary
A fluid sensor (10) comprises a base member (20) defining a fluid flow path (21), a cavity filler member (26) located externally of the base member (20), and a cavity member (30) located externally of the base member (20) and the cavity filler member (26). The cavity member (30) is configured so as to provide confinement for an electromagnetic field. The base member (20) and the cavity filler member (26) are both configured so as to permit transmission of electromagnetic radiation at a frequency of the electromagnetic field therethrough. The electromagnetic field may be a radio frequency (RF) electromagnetic field. The base member (20) and/or the cavity member (30) may define an outer cavity region externally of the base member (20). The cavity filler member (26) may completely or partially fill the outer cavity region. The fluid sensor (10) may be used in the measurement of the composition and/or flow characteristics of a fluid in the fluid flow path (21).