Microfluidic RF Sensor for Accurate Microplastic Concentration Measurement
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Solution Overview
Problem
Existing microplastic concentration measurement methods, particularly optical analysis equipment, struggle with accurately calculating concentration due to reliance on visual inspection, making it difficult to quantify microplastic levels effectively.
Innovation Solution
A microplastic concentration measurement sensor utilizing a microfluidic channel with a resonant layer and metamaterial pattern, coupled with a preprocessing unit, signal transmitter/receiver, and calculating unit to measure concentration through RF signal variations and resonance frequency shifts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical analysis methods are used to measure microplastic concentration, then visual inspection can be performed, but measurement accuracy deteriorates due to inability to accurately calculate concentration
Solution Approach 1:
The patent replaces optical analysis methods with RF signal-based detection. The sensor uses radio frequency signals to detect dielectric property changes caused by microplastics, substituting visual/optical methods with electromagnetic field-based measurement for accurate concentration detection without relying on visual inspection
Solution Approach 2:
The patent measures microplastic concentration by detecting changes in dielectric properties of the fluid. The RF signal characteristics (resonance frequency, reflection coefficient) change in response to microplastic concentration, allowing accurate measurement through parameter variation detection rather than visual inspection
2Device complexity
If traditional measurement methods are used, then equipment complexity may be lower, but the ability to identify microplastic type deteriorates due to ineffective identification
Solution Approach 1:
The patent identifies microplastic types by detecting specific RF signal parameters including resonance frequency shifts and reflection coefficients. Different microplastic materials exhibit distinct dielectric properties that manifest as characteristic signal parameter variations, enabling accurate type identification through multi-parameter analysis
Solution Approach 2:
The patent uses RF signals as an intermediary to interact with microplastics in the fluid. The electromagnetic field penetrates the fluid and interacts with microplastic particles, allowing non-contact, non-invasive detection of both concentration and material type without complex mechanical or optical intervention
3Measurement precision
If high-precision measurement sensors are developed, then measurement accuracy improves, but manufacturing cost and complexity worsen
Solution Approach 1:
The patent integrates the sensor with a microfluidic channel system that uses fluid flow to transport samples through the sensing region. The microfluidic structure enables precise control of fluid and particle flow, enhancing measurement accuracy while maintaining compatibility with standard microfabrication techniques for cost-effective manufacturing
Solution Approach 2:
The patent incorporates a filter wall with porous structure within the microfluidic channel. The porous filter allows fluid passage while retaining microplastic particles in the expanded portion, concentrating them for enhanced detection sensitivity without requiring complex mechanical filtration systems
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 and economical measurement of microplastic concentration and type by leveraging RF signal characteristics, improving sensitivity to dielectric property changes and allowing mass production via semiconductor processes.
Implementation Method 1
a resonant layer formed on a lower surface of the second substrate layer
Implementation Method 2
high sensitivity to changes in dielectric properties depending on the concentration of microplastic
Data Source
AI summary
Proposed are a microplastic concentration measurement sensor and a microplastic concentration measurement system using the sensor. The sensor may include a fluidic channel layer having a microfluidic channel formed on an upper surface thereof, and a molding layer formed on the fluidic channel layer and having first through-holes located respectively above one end and other end of the microfluidic channel. The sensor may also include a first substrate layer formed on the molding layer and having second through-holes located respectively above the first through-holes. The sensor may further include a single line formed on an upper surface of the first substrate layer, a second substrate layer formed below the fluidic channel layer, and a resonant layer formed on a lower surface of the second substrate layer.