Dielectric Resonance Moisture Measurement for Cotton Fiber
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Solution Overview
Problem
Current moisture measurement techniques for fibrous materials, such as cotton, are plagued by low accuracy and slow measurement speeds, making them unsuitable for in-line applications, especially due to issues like surface contamination and density limitations in microwave transmission methods.
Innovation Solution
An apparatus utilizing an electric field generator and an optical device to measure changes in the electric field caused by the material, which are correlated with the material's moisture content and mass, allowing for real-time, accurate moisture content determination using a processing unit that converts and processes the signals from both outputs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermal drying or chemical reaction analysis is used to measure moisture content, then measurement accuracy is improved, but measurement speed becomes too slow for in-line applications
Solution Approach 1:
The patent replaces thermal drying (mechanical/thermal process) and chemical reaction analysis with dielectric resonance spectroscopy, an electromagnetic field-based measurement technique that provides rapid non-contact moisture measurement suitable for in-line applications
Solution Approach 2:
The patent measures moisture content by detecting changes in dielectric properties of the material when exposed to electromagnetic fields at specific resonance frequencies, allowing rapid determination without physical contact or thermal processing
2Productivity
If electrical resistance or microwave transmission is used for in-line measurement, then measurement speed is improved, but accuracy deteriorates due to surface contamination and density limitations
Solution Approach 1:
The patent uses dielectric resonance as an intermediary mechanism that indirectly measures moisture content through the material's electromagnetic field interaction, avoiding direct contact with the material surface and thus eliminating contamination issues affecting electrode probes
Solution Approach 2:
The dielectric resonance measurement system can accurately measure moisture content across a wide range of material densities and compositions, making it universally applicable from low-density loose fibre to high-density compressed bales without requiring density-specific calibration
3Ease of operation
If microwave apparatus is applied to transport ducts with low density material, then in-line measurement capability is improved, but measurement viability deteriorates due to insufficient density
Solution Approach 1:
The patent changes the measurement approach from density-dependent microwave transmission to dielectric resonance spectroscopy, which measures moisture content based on the material's dielectric properties at resonance frequencies, making the measurement reliable across all density ranges from loose fibre to compressed bales
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 fast and accurate measurement of moisture content in fibrous materials, suitable for in-line applications, with a resolution of ±0.5% weight of water, and capable of handling up to 4,000 grams of material, improving processing efficiency and fiber quality.
Implementation Method 1
an electric field generator and when in use, the material whose desired property is to be measured is disposed in the electric field and changes in the electric field caused by the material provides a first output that is related to at least two properties of the material
Data Source
AI summary
The present invention relates to an apparatus and process for measuring a property of a material such as the moisture content of cotton fiber. An embodiment is specifically adapted for determining an absolute value of the moisture content of the cotton fiber while being conveyed through ducts such as the ducts of the ginning machine. The embodiment combines large area capacitor plates with light detectors.