Miniaturized Dielectric Spectroscopy Sensor Using Segmented Substrates
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Solution Overview
Problem
Existing dielectric spectroscopy systems are large and expensive, making them cost-prohibitive for certain applications, and they lack the portability and efficiency needed for rapid, high-throughput measurements of complex permittivity in small sample volumes.
Innovation Solution
A miniaturized dielectric spectroscopy system with a microfluidic sensor and integrated interface electronics that includes a transmitter and receiver for RF signals, capable of measuring dielectric permittivity in a microfluidic channel using co-planar capacitive sensors and a computing system for data processing, allowing for rapid and accurate measurements of complex permittivity in small sample volumes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional dielectric spectroscopy systems are used, then measurement accuracy is maintained, but system size and cost increase significantly
Solution Approach 1:
The sensor is divided into two separate substrates: a first substrate containing sensor electrodes and a second substrate containing a floating electrode and microfluidic channel. This segmentation allows each substrate to be optimized independently for its specific function while maintaining overall measurement accuracy, thereby reducing overall device complexity and cost
Solution Approach 2:
The invention transitions from a traditional planar sensor design to a three-dimensional stacked configuration where electrodes on one substrate face floating electrodes on another substrate separated by a microfluidic channel. This dimensional change enables compact integration while preserving the capacitive sensing mechanism necessary for accurate dielectric permittivity measurements
2Productivity
If miniaturized sensors are used, then portability and throughput are improved, but measurement precision may deteriorate
Solution Approach 1:
The microfluidic channel enables dynamic fluid flow through the sensing region, allowing rapid sample replacement and high-throughput measurements. The floating electrode design provides dynamic capacitive coupling that maintains sensitivity despite miniaturization, ensuring measurement precision is preserved while achieving portability and high productivity
3Quantity of substance
If small sample volumes are measured, then sample consumption is reduced, but measurement reliability may decrease
Solution Approach 1:
The microfluidic channel is designed with specific local characteristics including controlled dimensions, surface treatments, and flow dynamics that optimize sample interaction with the sensing electrodes. This local optimization ensures that even small sample volumes produce sufficient capacitive signal for reliable dielectric permittivity measurements while minimizing sample consumption
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 provides rapid, high-throughput, low-cost, and portable measurements of dielectric permittivity, enabling accurate characterization of small sample volumes with minimal sample preparation and low power consumption, suitable for various applications including biomedical and pharmaceutical research.
Implementation Method 1
a capacitive sensor comprising substantially co-planar sensing electrodes, a first of the sensing electrodes being coupled to the input and a second of the sensing electrode coupled to the output. The capacitive sensor also including a floating electrode spaced apart from the sensing electrodes by a space that defines a fluid channel
Implementation Method 2
Quantitative measurement of the complex dielectric permittivity of a material versus frequency (e.g., dielectric spectroscopy, also known as DS)
Data Source
AI summary
A sensor system can be configured to perform dielectric spectroscopy (DS). For example, the system can include a sensor configured to measure dielectric permittivity of a fluid in response to an RF input signal. Associated interface electronics can include a transmitter to drive the sensor with the RF input signal and a receiver to receive and process an RF output signal from the sensor in response to the RF input signal.