Planar Transmission-Line Sensor for Anisotropic Material Permittivity
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Solution Overview
Problem
Current methods for measuring the permittivity of materials, especially liquids, powders, and semisolid materials with anisotropic dielectric properties are limited by the need for precise sample preparation, alignment, and knowledge of transmission line dimensions, which complicates accurate and rapid permittivity measurements, especially in industrial settings.
Innovation Solution
A planar transmission-line sensor apparatus and a simple calibration method that allows direct determination of material permittivity from microwave scattering parameters without requiring precise knowledge of line dimensions, using a multiline technique to measure the propagation constant and a calibration procedure that accounts for radiation and conductor losses, enabling measurements of anisotropic dielectric properties with minimal sample preparation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional permittivity measurement methods are used, then measurement accuracy can be achieved, but precise sample preparation, alignment, and knowledge of transmission line dimensions are required, which complicates the measurement process
Solution Approach 1:
The patent extracts the dimensional parameters from the measurement process by using a calibration method that eliminates the need to know transmission line dimensions. The calibration procedure removes the dependency on precise geometric knowledge, thereby simplifying the measurement process while maintaining accuracy.
Solution Approach 2:
The patent applies preliminary calibration actions using standard materials with known permittivity values. This calibration step is performed before actual measurements to establish reference relationships, eliminating the need for precise dimensional measurements during the actual permittivity measurement process.
2Measurement precision
If traditional transmission line methods are used, then permittivity measurements can be obtained, but radiation and conductor losses affect measurement accuracy
Solution Approach 1:
The patent uses a calibration method that incorporates feedback from measurements on standard materials with known permittivity. This feedback allows the system to compensate for radiation and conductor losses by establishing empirical relationships that account for these energy losses, thereby improving measurement accuracy.
3Measurement precision
If precise knowledge of transmission line dimensions is required, then accurate permittivity measurements can be made, but this requirement increases measurement time and complexity
Solution Approach 1:
The patent extracts the dimensional dependency from the measurement process through calibration. By using standard materials with known permittivity, the method eliminates the need to measure or know transmission line dimensions, thereby reducing measurement time and complexity while maintaining accuracy.
Solution Approach 2:
The calibration procedure performs preliminary measurements on standard materials to establish reference data. This preliminary action creates a lookup table or calibration curve that can be used for rapid subsequent measurements without requiring repeated dimensional measurements, thus reducing measurement time.
4Productivity
If conventional measurement methods are used, then permittivity data can be obtained, but rapid measurements in industrial settings are difficult to achieve
Solution Approach 1:
The patent performs preliminary calibration using standard materials to establish empirical relationships. Once calibrated, the system can rapidly measure unknown materials without requiring repeated complex setup procedures, thereby achieving both high speed and high accuracy in industrial settings.
Solution Approach 2:
The calibration method enables the measurement system to self-correct for losses and dimensional variations by using reference standards. This self-service capability allows rapid measurements to be performed automatically without requiring manual intervention for alignment or dimensional measurement, improving productivity while maintaining precision.
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 rapid, non-destructive, and accurate permittivity measurements of materials with anisotropic properties, suitable for industrial applications, including determining moisture and density of powdered materials and quality parameters of food products, with reduced measurement uncertainty and minimal sample preparation.
Implementation Method 1
A planar transmission-line sensor apparatus and a simple calibration method that allows direct determination of material permittivity from microwave scattering parameters without requiring precise knowledge of line dimensions, using a multiline technique to measure the propagation constant
Implementation Method 2
a calibration procedure that accounts for radiation and conductor losses
Implementation Method 3
a calibration procedure that accounts for radiation and conductor losses
Data Source
AI summary
A low cost planar transmission line sensor and simple calibration method for measuring the complex permittivity of materials with minimal sample preparation over a wide band of radio- and microwave frequencies. The sensor is also used for measuring anisotropic dielectric properties of materials with a defined grain.