Cavity Resonator System with Screening Ring for EM Property Measurement
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Solution Overview
Problem
Cavity resonators used to measure electromagnetic properties of pipe contents are affected by changes in environmental conditions such as temperature and pressure, leading to errors in determining dielectric properties due to the dependence on insulator material properties, which are difficult to accurately calibrate, especially in extreme applications like the petrochemical industry.
Innovation Solution
A cavity resonator system comprising a primary and secondary resonator with a conductive casing, insulator material, and antennae, where the secondary resonator includes a conductive screening ring to minimize the impact of environmental changes, allowing for compensated measurements by combining parameters from both resonators to isolate the EM properties of the pipe contents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a cavity resonator uses insulator material to fill the cavity outside the pipe, then the mechanical strength and structural stability are improved, but the measurement precision deteriorates due to environmental sensitivity
Solution Approach 1:
The system divides the measurement function into two separate resonators: a primary resonator for general measurement and a secondary resonator with screening rings for environmental compensation. This segmentation allows each component to specialize in specific functions, with the secondary resonator specifically addressing environmental interference.
Solution Approach 2:
The conductive screening rings act as an intermediary element between the resonant EM field and the pipe contents. These rings create a controlled electromagnetic environment that isolates the measurement from external environmental factors while still allowing the desired measurements to proceed.
2Difficulty of detecting and measuring
If the resonance frequency is used to determine dielectric properties of pipe contents, then the measurement capability is improved, but the reliability deteriorates due to environmental condition dependence
Solution Approach 1:
The system uses the secondary resonator to provide feedback information about environmental conditions. By comparing measurements from both resonators, the system can identify and compensate for environmental effects on the primary measurement, thereby improving reliability.
Solution Approach 2:
The invention changes the electromagnetic parameters of the secondary resonator by introducing conductive screening rings. This modification alters the resonant frequency and field distribution in a controlled manner, creating a measurement that is specifically sensitive to environmental changes while being less sensitive to pipe contents.
3Measurement precision
If calibration is performed to compensate for environmental conditions, then the measurement accuracy is improved, but the ease of operation deteriorates due to practical implementation difficulties
Solution Approach 1:
The dual-resonator system performs self-calibration by using the secondary resonator's environmental sensitivity to automatically compensate for environmental effects on the primary resonator. This self-service mechanism eliminates the need for external calibration procedures or manual environmental sensing.
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 system effectively reduces the dependence on environmental EM properties, providing accurate measurements of pipe contents' properties like water percentage and salinity by compensating for changes in temperature and pressure, enhancing measurement reliability in extreme conditions.
Implementation Method 1
at least one conductive screening ring that extends around the location to be occupied by a pipe portion received in the openings for screening the interior of the screening ring from a resonant electro-magnetic field generated inside the cavity by an antenna of the secondary resonator
Implementation Method 2
antennae for generating and detecting a resonant electro-magnetic field inside the cavity
Data Source
AI summary
A cavity resonator system for measuring EM properties of the contents of a pipe portion comprises a primary resonator and a secondary resonator each with the same configuration comprising a conductive casing that defines a cavity and has openings for receiving a pipe portion, insulator material disposed inside the cavity, and antennae for generating and detecting a resonant EM field inside the cavity. In addition, the secondary resonator comprises at least one conductive screening ring that extends around the location occupied by a pipe portion for screening the interior of the ring from the field generated inside the cavity of the secondary resonator. By combining measures of parameters of the field from both resonators, the system may be used to generate a measure representative of EM properties of the contents of the pipe portion that is compensated for variation in the EM properties of the insulator material.