Acoustic Transducer Driver Controller Reactance Minimization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional acoustophoresis systems face challenges in scalability and energy efficiency, particularly at the macro-scale, where planar acoustic standing waves require continuous operation and generate heat, hindering continuous processing and are not scalable for high-flow rates.
Innovation Solution
The use of an electrical source to generate acoustic standing waves through a piezoelectric material and a reflector, with a control system that fine-tunes the acoustic standing wave to trap, separate, and characterize particles and fluids, optimizing energy usage and efficiency by dynamically responding to physical changes in the acoustic standing wave.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If planar acoustic standing waves are used for particle separation, then separation efficiency is improved, but the system generates heat and requires continuous operation, reducing energy efficiency and scalability
Solution Approach 1:
The patent employs periodic pulsing of the acoustic standing wave rather than continuous operation. The acoustic wave is activated in pulses to trap particles at nodes, then deactivated to allow particle release and system cooling. This periodic on-off cycling maintains separation efficiency while dramatically reducing average energy consumption and heat generation, enabling scalable continuous processing operations.
2Measurement precision
If conventional half or quarter wavelength acoustic chambers are used at micrometer scale, then particle trapping is achieved, but flow rates are limited to very slow speeds, reducing productivity
Solution Approach 1:
The patent transitions from conventional one-dimensional half or quarter wavelength acoustic chambers to a multi-dimensional acoustic field configuration. By creating standing waves in multiple dimensions simultaneously, the system achieves particle trapping while accommodating much higher flow rates. This dimensional expansion allows the acoustic field to process fluids at macro-scale velocities rather than being constrained to slow micro-scale flow, thereby dramatically increasing productivity.
3Measurement precision
If acoustic standing wave frequency is increased to trap smaller particles, then trapping precision for small particles is improved, but energy consumption increases, worsening energy efficiency
Solution Approach 1:
The patent implements dynamic frequency modulation where the acoustic standing wave frequency is adaptively adjusted based on particle size detection. For smaller particles requiring higher frequencies for effective trapping, the system temporarily increases frequency only during the trapping phase. During release and reset phases, the frequency is reduced to minimize energy consumption. This dynamic adaptation allows precise trapping of small particles when needed while maintaining energy efficiency during non-trapping intervals.
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 enhances the scalability and energy efficiency of acoustophoresis, enabling continuous operation and improved separation efficiency while minimizing energy input, applicable in various fields including biopharma, energy, and bioagriculture.
Implementation Method 1
An electrical source, which may include an oscillator and an amplifier, may be utilized to perturb a piezoelectric material that may be utilized to generate acoustic waves
Implementation Method 2
The pressure profile in a standing wave contains areas of local minimum pressure amplitudes at standing wave nodes and local maxima at standing wave anti-nodes. Depending on their density and compressibility, the particles can be trapped at the nodes or anti-nodes of the standing wave
Data Source
AI summary
An acoustophoretic system is controlled and driven to attain a desired level of performance. An RF controller and a driver provide a frequency and power to an acoustic transducer, which can be implemented as a piezoelectric element, which presents a reactive load or a complex load. A controller implements a control technique for efficient transducer operation. The control technique can locate a frequency for operation that is at a reactance minimum or maximum for the system to produce a modal pattern and to provide efficient operation of the transducer. A method of detecting a minimum or maximum reactance in a acoustophoretic system used to trap, separate, deflect, cluster, fractionate or otherwise process particles or secondary fluids or tertiary fluids in a primary fluid and utilizing the frequency of the detected reactance to operate the acoustophoretic system.