Floating Electrode Acoustofluidic Transducer Circuit
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Solution Overview
Problem
Existing acoustofluidic devices using two ultrasound transducers require complex drive circuits and are prone to interference due to the need for separate drive signals, increasing complexity and potential crosstalk.
Innovation Solution
A method and device utilizing a common electrode configuration where the electrical potential of the first electrodes floats, allowing a single drive signal to be applied between the second electrodes of the transducers, which capacitively and resistively propagates through the piezoelectric material, achieving a 180° phase shift without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate drive signals are used for two ultrasound transducers, then each transducer can be independently controlled, but the device complexity and potential crosstalk increase
Solution Approach 1:
The patent combines two separate drive signals into a single drive signal that is applied to a common electrode shared by both ultrasound transducers. This merging approach reduces the number of electrical connections and circuit components while maintaining the ability to independently control each transducer through the single signal, thereby resolving the contradiction between independent control and device complexity
Solution Approach 2:
The common electrode serves multiple functions: it acts as an electrode for the first ultrasound transducer, an electrode for the second ultrasound transducer, and a shared reference point for both transducers. This multi-functionality allows a single drive signal to control both transducers effectively, reducing circuit complexity while maintaining independent control capability
2Ease of operation
If two separate drive signals are applied to two ultrasound transducers, then each transducer can be driven independently, but the number of electrical components increases
Solution Approach 1:
The patent merges the electrical connections by having both ultrasound transducers share a common electrode. A single drive signal is applied to this common electrode, eliminating the need for separate electrical connections and components for each transducer, thus reducing the total number of electrical components while maintaining independent driving capability through signal processing
3Reliability
If conventional transducer connections are used, then each transducer has dedicated electrodes, but manufacturing complexity increases
Solution Approach 1:
The patent merges the electrode structure by implementing a common electrode that serves both transducers. This reduces the number of discrete components that need to be assembled and connected during manufacturing, simplifying the fabrication process while maintaining reliable electrical connections through the shared electrode structure
Solution Approach 2:
The common electrode is designed to fulfill multiple roles simultaneously - serving as an electrode for both transducers and providing a shared reference potential. This universal design reduces manufacturing steps and assembly complexity compared to implementing separate dedicated electrodes for each transducer
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 reduces the number of electrical components needed, simplifies manufacturing, and maintains efficient acoustophoretic processes by eliminating the need for separate drive signals, thus lowering costs and environmental impact.
Implementation Method 1
a first and a second ultrasound transducer, each provided in acoustic contact with the substrate for transferring ultrasonic vibrations to the substrate and causing the substrate to vibrate, wherein the first and the second ultrasound transducers each comprise a first electrode and a second electrode in contact with a piezoelectric or electrostrictive material
Implementation Method 2
a first and a second ultrasound transducer, each provided in acoustic contact with the substrate for transferring ultrasonic vibrations to the substrate and causing the substrate to vibrate, wherein the first and the second ultrasound transducers each comprise a first electrode and a second electrode in contact with a piezoelectric or electrostrictive material
Implementation Method 3
applying a drive signal between the second electrodes of the first and second ultrasound transducers, wherein the drive signal has a frequency f that corresponds to an acoustic resonance peak of one or more of the substrate, the microfluidic cavity filled with a fluid, and the transducers
Implementation Method 4
a standing wave may appear in the channel. This standing wave exerts a force on the particles in the suspension dependent on the acoustic contrast of each individual particle
Data Source
Figure 1A~1B
Figure 1C~2A
Figure 2B~3
AI summary
A method of performing an acoustofluidic operation, comprising the steps of: a. providing (1) an acoustofluidic device (10) comprising: - a substrate (12) in which a microfluidic cavity (30) is positioned, and - at least a first (50a) and a second (50b) ultrasound transducer (50), each provided in acoustic contact with the substrate (12) for transferring ultrasonic vibrations to the substrate and causing the substrate to vibrate, wherein the first and the second ultrasound transducers each comprise a first electrode (52) and a second electrode (56a, 56b) in contact with a piezoelectric or electrostrictive material (54), and wherein the first electrodes are in electric contact with each other, b. providing a fluid, such as a liquid (2) or liquid suspension in the microfluidic cavity (30), c. applying (56a, 56b) of the first and second ultrasound transducers (50a, 50b), wherein the drive signal has a frequency f that corresponds to an acoustic resonance peak of one or more of the substrate, the microfluidic cavity filled with a fluid, and the transducers (50a, 50b), and d. letting the electrical potential of the first electrodes (52) float.